The International Hydrofoil Society (IHS) Hydrofoil Correspondence Archives


Updated last August 20, 2006

Hydrofoils: Models

Hydrofoils: Models      Scroll To Top Top


Archived Messages



“1”,”937916″,”7″,”Water jet system of my RC pegasus ||937916″,”Excellent photos and attachment… an inspiration to others!”,”2005-11-25″,”Barney C Black”,”nopswd”,” “,” “,”934934”

“2”,”936876″,”7″,”‚vater jet system of my RC pegasus ||936876″,”Yoichi,

Congratulations on the successful construction of a waterjet powered hydrofoil model. You may be the first person who has done this!

I see from your photographs that you have made the inlet ducts larger than scale size in order to reduce frictional losses. At some stage please write more about the design and how well it runs. For example, you could tell us about the source of waterjet pump, motor voltage and current and running time of the model.”,”2005-11-22″,”Martin Grimm”,”nopswd”,” “,”seaflite at”,”934934″

“3”,”934934″,”7″,”‚vater jet system of my RC pegasus ||934934″,”It introduces the water jet system of the RC pegasus model ship of me who succeeds in surfacing in the first launching introduced in the summer of this year. The secret of the success in my RC pegasus was to have reproduced the research of the pegasus of the thing, and building in the miniaturization and the RC system faithfully. The principle of not the mimicry of the style but the thing was reproduced. The water duct system was researched according to the material of IHS. The water duct system with a little resistance demonstrates the ability of the water jet pump enough. This concludes my report. “,”2005-11-19”,”yoichi takahashi “,”nopswd”,” “,””,”7″

“4”,”923354″,”7″,”Model Magazines and Plans for sale||923354″,”I put a big batch of hydrofoil magazines with articles on hydrofoil models up for auction on Search for item number: 6985656455. Bidding starts at 6.95 USD. Auction ends Nov-09-05 10:34:41 PST. In addition to the magazines, there are three large, separate full size plans for building hydrofoil models. Both sail and motor powered models are represented, as are display and working models. Some of the working models can be radio-controled; others you just set the rudder for a circular or straight course.

This would be a good instant collection for any modeler interested in hydrofoils. It could also be a resource for a high school science teacher or scout leader interested in offering kids a chance to build and test a hydrofoil as a school project.
“,”2005-10-31″,”Barney C Black”,”poopdeck”,” “,” “,”7”

“5”,”921349″,”7″,”Re; Hegi police Hydrofoil||921349″,”Hello,
If your in europa please mail me at
about he hegi.
Regards Mark”,”2005-10-27″,”Mark van Rijzen”,”nopswd”,” “,””,”916576″

“6”,”920909″,”7″,”Hydrofoil Models||920909″,”This is a website I found with some scale hydrofoil models. Check it out.”,”2005-10-26″,”Rick”,”nopswd”,” “,””,”7″

“7”,”920905″,”7″,”Re; Hegi police Hydrofoil||920905″,”If you are interested in selling this boat please contact me.”,”2005-10-26″,”Rick”,”nopswd”,” “,””,”916576″

“8”,”917254″,”7″,”Re; Hegi police Hydrofoil||917254″,”This sounds like a good candidate to be offered for sale internationally at auctioni on”,”2005-10-20″,”Barney C Black”,”poopdeck”,” “,” “,”916576”

“9”,”916576″,”7″,”Hegi police Hydrofoil||916576″,” I have a Hegi Police Hydrofoil Model , the box is not in the best condition, but the model is in New condition. Everyhting appears to be there along with the Tube of Glue, witch I sure is no longer any good.I would like to sell or trade for other Boats. I’m into Fast attack. Thank you Marc “,”2005-10-19″,”Marc Tieben”,”nopswd”,” “,””,”7″

“10”,”894281″,”7″,”My three RC hydrofoil craft introduction.||894281″,”It introduces each part of my PHM.
It concentrated on the research of the hydrofoil system of the pegasus, not my ruining the function when producing it though I faithfully attempted simplifying by it as a radio controller model, and reproduction. The waterway duct of the hydrofoil that the surfacing power influences is a result of the research.
After all, there was a Japan and United States distances, too and it was impossible though it actually went to the museum and the locale in the United States where the pegasus was put and it had wanted to do a detailed observation.
However, abundant images of IHS served as a reference very much.
“,”2005-09-14”,”yoichi takahashi “,”nopswd”,” “,””,”888238″

“11”,”889917″,”7″,”My three RC hydrofoil craft introduction.||889917″,”Thank you. Barney san
I will continue, be fresh, produce the RC model of the surprise, and introduce it with
this BBS.
“,”2005-09-07”,”yoichi takahashi “,”nopswd”,” “,””,”888238″

“12”,”888238″,”7″,”My three RC hydrofoil craft introduction.||888238″,”Awesome!”,”2005-09-04″,”Barney C Black”,”poopdeck”,” “,” “,”884437”

“13”,”884437″,”7″,”My three RC hydrofoil craft introduction.||884437″,”It introduces the work of me current adds the latest work pegasus.
NO,1 Missile boat PG|‚O‚P of JSDMF¡
NO,2¤Boing JET FOIL 929.
The original hydrofoil control system that uses both of these all Submarged type hydrofoil boats entire small giros with making by oneself is installed.
“,”2005-08-28”,”yoichi takahashi “,”nopswd”,” “,””,”7″

“14”,”882561″,”7″,”Gunze Sangyo ||882561″,”I have a few vintage Gunze Sangyo Super Comet Hydrofoil kits for sale if anyone is interested. They are a recent warehouse find. Sale price is $525 + shipping anywhere in the world. Payment by PayPal (we have a business account so you can use your credit card via PayPal as well) or money order. Pictures are below. I am a reputable seller specializing in RC cars and trucks. Hence, the sale of these boats which for obvious reasons do not fit in my collection.

My website (with phone number) is

You can view my Ebay feedback here:

Most of my private collection and contact information can also be found here:

Pictures of kits for sale:

Thank you,

– Alex
“,”2005-08-24″,”Alex Oliva”,”nopswd”,” “,””,”7″

“15”,”882560″,”7″,”Gunze Sangyo ||882560″,”I have a few vintage Gunze Sangyo Super Comet Hydrofoil kits for sale if anyone is interested. They are a recent warehouse find. Sale price is $525 + shipping anywhere in the world. Payment by PayPal (we have a business account so you can use your credit card via PayPal as well) or money order. Pictures are below. I am a reputable seller specializing in RC cars and trucks. Hence, the sale of these boats which for obvious reasons do not fit in my collection.

My website (with phone number) is

You can view my Ebay feedback here:

Most of my private collection and contact information can also be found here:

Pictures of kits for sale:

Thank you,

– Alex
“,”2005-08-24″,”Alex Oliva”,”nopswd”,” “,””,”7″

“16”,”880301″,”7″,”Re; introduces RC hydrofoil PEGASUS||880301″,”Snap introduction in test Sou of my RC pegasus.
It reports on the snap testing my RC pegasus hydrofoil missile boat
It is an impellent of the water jet and an image in surfacing Sou.
“,”2005-08-20”,”yoichi takahashi “,”nopswd”,” “,””,”879209″

“17”,”880300″,”7″,”Re; introduces RC hydrofoil PEGASUS||880300″,”Snap introduction in test Sou of my RC pegasus.
It reports on the snap testing my RC pegasus hydrofoil missile boat
It is an impellent of the water jet and an image in surfacing Sou.
“,”2005-08-20”,”yoichi takahashi “,”nopswd”,” “,””,”879209″

“18”,”879209″,”7″,”Re; introduces RC hydrofoil PEGASUS||879209″,”Thank you. !Umi
I made three hydrofoil crafts (submargide foil type) succeed in this pegasus. I do not
stop the challenge to the radio controller technology not exhausted.
This concludes my report.
“,”2005-08-18”,”yoichi takahashi “,”nopswd”,” “,””,”879094″

“19”,”879208″,”7″,”Re; introduces RC hydrofoil PEGASUS||879208″,”Thank you. !Umi
I made three hydrofoil crafts (submargide foil type) succeed in this pegasus. I do not
stop the challenge to the radio controller technology not exhausted.
This concludes my report.
“,”2005-08-18”,”yoichi takahashi “,”nopswd”,” “,””,”879094″

“20”,”879094″,”7″,”Re; introduces RC hydrofoil PEGASUS||879094″,”Takahashi san,
Omedeto gozaimasu.

You make this look too easy. I am currently struggling with power vs heat and running time. I believe I have the motor and pump configured. The next step for me is to water cool it and some slight foil changes. I still feel like the boat is struggling to get lift and planing speed.

“,”2005-08-18″,”Umi_Ryuzuki”,”nopswd”,” “,””,”878596″

“21”,”878596″,”7″,”Re; introduces RC hydrofoil PEGASUS||878596″,”Thank you1. @Barney san
The development period of about one year was necessary for the modeling
of this pegasus.
My being very satisfied with result before
The pegasus who was the active service is very glad to reproduce the RC
model Sou appearance.
This concludes my report.
“,”2005-08-17”,”yoichi takahashi “,”nopswd”,” “,””,”877873″

“22”,”877873″,”7″,”Re; introduces RC hydrofoil PEGASUS||877873″,”Fantastic… Great modeling (and photography!)”,”2005-08-16″,”Barney C Black”,”poopdeck”,” “,” “,”877240”

“23”,”877321″,”7″,”introduces RC hydrofoil PEGASUS-2||877321″,”The image of introduces RC hydrofoil PEGASUS is added.
“,”2005-08-15”,”yoichi takahashi “,”nopswd”,” “,””,”7″

“24”,”877240″,”7″,”introduces RC hydrofoil PEGASUS||877240″,”The brave figuer of the success “PEGASUS” to the RC modeling of PHM1 again.
It introduces RC hydrofoil missile boat PHM1 “PEGASUS” of my latest work.
It is a radio controller model of hydrofoil missile boat PHM1 “PEGASUS” that had
attached to the patrol of the Caribbean sea with USS that I produced in the original
before that introduces here.
The feature of this model ship surfaces by using the hydrofoil by the same water jet
propulsion principle as the thing and starts.
Water is jetted at high speed with the micro water jet pump developed in the original,
it surfaces from the surface of the water with the hydrofoil at the reactionary speed,
and Sou ..
The stability when surfacing achieved a steady running by a small giro by the
hydrofoil automatic control theory originally developed.
1:50 main spec = scale scales of this boat
8.4V?Piezo-electric vibration giro control hydrofoil system and total length = ..820mm..
above equipped with Ni-Cd battery, balsa monocoque hull, 500 faction electric motor,
and original production water jet pump
“,”2005-08-15”,”yoichi takahashi “,”nopswd”,” “,””,”7″

“25”,”862106″,”7″,”Sparviero update||862106″,”Not as much accomplished as Takahashi-san, but the boat runs.
I need much more speed to even get the hull to plane up and out of the water. More design work on the pump, speed and size. I hope to get it foil borne before the end of the Summer season.

“,”2005-07-17″,”Umi_Ryuzuki”,”nopswd”,” “,” “,”0”

“26”,”851276″,”7″,”scale model hysrofoil, need some advice||851276″,”Hello Divyam,

How are you going with your model in the meantime? Have you started on the hull or selected a motor yet?

If I understood your plans correctly, you will have foils at the front of the model only and the back will not be supported by a foil?

The size of motor you select will depend on the weight of the model and how fast you would like it to go. It is important to keep the weight of the model as light as possible by using light weight materials for the hull and foils. Thin plywood (preferably no more than 2mm) could be suitable and you could also consider using balsa wiid, but in that case you need to be careful to waterproof it carefully with varnish. To propel such a model, an inclined shaft driven directly from the motor is probably most easy. A typical DC electric motor used on electric race cars should be OK if your model is light enough.

If you are able to give us more details of the geometry and expected weight of your model, then that will help when you are seeking further advice. It is a good idea to use a set of kitchen scales to weigh the various parts of the model you are planning to use, for example the hull materials, motor, batteries, propeller shaft, foils, radio control receiver and servos etc. You can then get a better estimate of the expected total weight the model.


Martin”,”2005-06-26″,”Martin Grimm”,”nopswd”,” “,””,”0″

“27”,”848065″,”7″,”Re; Lines/Plans for PHM Pegasus?||848065″,”You can get plans for the Boeing PHMs at
They have plan view, outboad profile, hull lines, and some detail sheets showing sections, and mechanical. The plans are in Metric and English measurements.”,”2005-06-19″,”Umi_Ryuzuki”,”nopswd”,” “,””,”0″

“28”,”843240″,”7″,”Re; Lines/Plans for PHM Pegasus?||843240″,”Hi! Markus san
Your Spabiero class model is wonderful.
It was a log of past BBS, there was writing the drawing of the PHM pegasus from Mr. Barney, and
look once, please. MsgidNO,

“,”2005-06-09”,”yoichi takahashi “,”nopswd”,” “,””,”0″

“29”,”842581″,”7″,”Lines/Plans for PHM Pegasus?||842581″,”Dear Sirs,

I have recently built the Italian Hydrofoil Sparviero as none working
modell in 1/72nd. (see picture following).

(See attached file: Sparviero_frontsideview2.jpg)

I´d like to build next the PHM Pegasus also as none working display modell
scale 1/72nd.

Do you know where to get accurate plans / drawings including line drawings
of the hull?

Best regards

Markus Schott
Germany”,”2005-06-08″,”Markus Schott”,”nopswd”,” “,””,”0″

“30”,”819370″,”7″,”Re; Re; Re; Nikko Shockwave wanted||819370″,”Hi Rod, thanks… there is no wiser voice than the voice of experience. Good advice!”,”2005-04-27″,”Barney C Black”,”poopdeck”,” “,” “,”0”

“31”,”815834″,”7″,”Re; Re; Nikko Shockwave wanted||815834″,”Be careful that u get a good one. I have 3 of them. Only 1 actually gets up on the foils and scoots. The others work ok but the motor does not seem to develop the necessary power. The one for sale on ebay now has a broken propellor. And I don’t think u can change it even if it comes with an extra. I wud be happy to sell you one of mine.”,”2005-04-19″,”Rod Clayards”,”nopswd”,” “,””,”0″

“32”,”814199″,”7″,”Re; Nikko Shockwave wanted||814199″,”There is a Nikko Shockwave up for auction on right now. Search for item # 5969570866. Starting bid is 99 cents. Auction closes in 5 days. The following link will take you directly to the item listing:″,”2005-04-16″,”Barney C Black”,”poopdeck”,” “,” “,”0”

“33”,”811816″,”7″,”scale model hysrofoil, need some advice||811816″,”You should definitely read through the historical correspondence in the IHS archives on models. See the following pages:

Also, a number of modelers are members of IHS, so hopefully one or more of them will see your posted message and will respond to you.”,”2005-04-11″,”Barney C Black”,”poopdeck”,” “,” “,”0”

“34”,”811810″,”7″,”Re; Nikko Shockwave wanted||811810″,”I have seen them up for sale at auction on eBay from time to time. I don’t know if you are an eBay member, but if you are, you can set up an automatic search in the “My eBay” section of the website. It will execute your search every day and send you an email if it finds anything new. Your search could be: +nikko +shockwave.”,”2005-04-11″,”Barney C Black”,”poopdeck”,” “,” “,”0”

“35”,”810414″,”7″,”Nikko Shockwave wanted||810414″,”Does anyone know where I can get a Nikko Shockwave model hydrofoil? I’ve searched the web but it seems that this product is not currently available. “,”2005-04-09″,”Jason”,”nopswd”,” “,””,”0″

“36”,”809683″,”7″,”scale model hysrofoil, need some advice||809683″,”Respected Sir/Madam,

I am Divyam Nagpal residing in New Delhi , India and was keen on seeking information on hydrofoils.I have developed designs of a scale model of a hysrofoil and would like some advice on it.
My design is basically based on a rigid hull with two foils on either sides and a meachanism following the principle of aerofoil in the front for lift.It would be about 200 cm in length and 15 cm wide at the centre. Firstly i would like to know what kind of motor would be suitable.Also i would like to know what material can be used as a hull.I have already obtained the R/C set and is ready to be installed.
I would be highly obliged if you could answer soon as this project is already delayed by a long time.

Divyam”,”2005-04-07″,”Divyam”,”nopswd”,” “,””,”0″

“37”,”805186″,”7″,”Robbe F-1 Skiboot||805186″,”I just happened upon a kit of the Robbe F-1 Skiboot high speed hydrofoil. Has anyone built this kit. I know it is not like most of the hydrofoil kits since it is not scale but is there any interest in this kit? I also have a model by Hydrofoils Inc. (not making models any more). Has anyone built this one either?”,”2005-03-30″,”Rick”,”nopswd”,” “,” “,”0”

“38”,”794425″,”7″,”radio controller high-speed SEStype ship||794425″,”Thank you. !@Mr. Bill White san
I am producing the radio controller model of PHM Pegasus besides this SES type
now. It introduces it with IHS again when launched.
This concludes my report.
“,”2005-03-11”,”yoichi takahashi “,”nopswd”,” “,””,”0″

“39”,”794416″,”7″,”Re; R/C high-speed SES ship||794416″,”Thank youI. Mr. Barney.
I can be going to keep offering an interesting topic to the IHS member in the future. Please expect it in the future.
Moreover, please sometimes look at URL that treats my work. There is a possibility that a new work is recorded. The image of the aircraft and the hovercraft was up-loaded recently.
This concludes my report.
“,”2005-03-11”,”yoichi takahashi “,”nopswd”,” “,””,”0″


For the past 26 years I have served as a project supervisor creating museum exhibits in honor of U.S. vets and those of our allies. Some of the venues I have done work for include the USS Intrepid Sea Air Space Museum and the Museum of Polish Military Heritage in America, both in New York City. Load my name Mike Dobrzelecki into a Google Search Engine and you’ll see examples of some of my work on two continents over the years.

I saw your name & email on the IHS website and hope you can provide some help on a research project concerning the Tucumcari PGH-2.

I built the old Aurora kit when it first came out in the late 1960’s early 1970’s (?) and not too long ago picked up a derelict unpainted damaged built-up, as well as a pristine complete kit still in the original box. I even still have some parts from my original build model.

My intent is to build one ‘flying’ and one in the water with its struts and foils folded up and possibly write a good article on the Tucumcari.

I have everything available on the internet for this fascinating hydrofoil, as well as, the old Sea Clasics issue with the Tucumcari on the cover. Recently, I obtained a copy of the History Channel Mail Call episode with the world’s most famous D.I. narrating exquisite video of the this fast-fighting boat in action – great footage, BTW. I have even manage to track down some of its crew for personal interviews. Most frustratingly, the crew I talked to so far all stated that their photos went missing during moves over the years.

I am looking for more photos including details of the interior, the exterior fit on the cockpit/bridge and upper surface of the hull and an answer to what’s in the large opening aft of the .50 cals and masts/antennae. I would also like to track down some more crew and any other books or naval history magazine articles on the the Tucumcari. Any leads would be appreciated.

Mike Dobrzelecki
3040 Clayton Street
Easton PA 18045
“,”2005-03-07”,”Mike Dobrzelecki “,”members”,” “,””,”0″

“41”,”791941″,”7″,”radio controller high-speed SEStype ship||791941″,”Great pictures of your model.

I got to see the full sized version about a year ago as the Vessel visited the US for joint exercises with the US Navy. It was a very impressive vessel. It was the largest Foam sandwich fiberglass ship that I have ever seen. The workmanship was supurb throughout.

Go to IHS web site at

Under Restoring a PHM in Missouri There is a briefing on the Norwegian Surface Effect Ship (SES) Fast Patrol Boat (FPB) KNM SKJOLD where you can download: skjold brief.pdf
to download a skjold Presentation with photos.

It was twice as efficient as any of the US Navy’s proposed new LCS.

The Model is very impressive as well. Does it have a working model RIB like the big one does?

Bill White”,”2005-03-07″,”Bill White”,”nopswd”,” “,””,”0″

“42”,”791409″,”7″,”R/C high-speed SES ship||791409″,”This is a very interesting and sophisticated model at

Thank you Yoichi for posting this. Several IHS members have worked on other Advanced Marine Vehicles (AMVs) besides hydrofoils and will be interested in this!”,”2005-03-05″,”Barney C Black”,”poopdeck”,” “,””,”0″

“43”,”790044″,”7″,”PHM Model Plans||790044″,”There have been many requests for plans to model PHMs. There is an interesting auction of 1:107 scale model PHM plans on eBay, Item number: 5960815691, ending March 7. This is only a one page sheet with three views, not much detail, but a start. Description says the plans are from Morrison Repla-Tech by Robert C. Morrison. I googled that and got one hit, a posted thread. Excerpt: “REPLA-TECH INTERNATIONAL P.O.Box 461000 Cole Branch Los Angeles, CA 90046-1000 Alain Proteau now owns Repla-Tech. Good source of scale documentation on your favorite airplane. 3-view drawings and photos galore! Bob Morrison’s plans range from his own to imports. Especially good coverage of race planes. Catalog $ 2.50. More than one person has tried to phone Alan to no avail. Try a post card first before risking yer $2. 50. Keep me posted. SCALE MODEL RESEARCH is now handling the Repla-Tech collection of photos.””,”2005-03-03″,”Barney C Black”,”poopdeck”,” “,””,”0″

“44”,”784147″,”7″,”radio controller high-speed SEStype ship||784147″,”The third radio controller high-speed ship series bounce. Stately missile boat
Skyol launch

The radio controller model production of a high-speed ship is started and

Northern Europe Norway naval forces this time for , five ..earliness.. years.

It is the state-of-the-art, high-speed missile boat { Skyol }

With the hovercraft named SES = Sarfasefectoshipp (surface of the water effect boat)

It has the high speed and the control stability in the high Bullitt type of the

catamaran ship.

¡ It is a light hull made of composite materials and a water jet bimotored of
the gas turbine drive.

¡ Thorough Stealth shape is deeply moved by the fjord camouflage there is power
and with the hull and the feature.

¡ There is fan air intake for surfacing on the deck.
¡ Equipped with two storage missile container eight2
¡ This hull is reproduced by 1:50 scales.
800mm in the total length

2250 weight = G

Equipped with 500 faction electric and drive self-made water jet device

Niccad and lithium Polymer battery drive

>>Please ..following.. refer to URL of publishing for the article and the image
of details.

URL:″,”2005-02-19″,”yoichi takahashi “,”nopswd”,” “,””,”0″

“45”,”770509″,”7″,”vs8 pictures||770509″,”I am looking for any pictures of the vs8 particularly on the prop rudder area – I can not contact challenge publications to see if they had an old copy of the scale modeler magazine from july 82 which showed photos of the 32nd parallel kit”,”2005-01-25″,”David Short”,”nopswd”,” “,””,”0″

“46”,”768757″,”7″,”Re: simple hydrofoil plans?||768757″,”Here are some pages of interest:

I note that on eBay, there is a recurring offer to sell a set of CDs with model boat plans. The current notice is item #5950983858, titled SIXTY THREE Model Boat Plans on Four CD Set. One of the models is described as “Electric Hydrofoil.”
“,”2005-01-22″,”Barney C Black”,”poopdeck”,” “,””,”0″

“47”,”760909″,”7″,”propose simple model hydro foil||760909″,”Hi! Conor Davies san
I am a modeler of the radio controller ship of Japan.
I propose the idea of the hydrofoil craft that remodels the electric model boat marketed to you.
The hydrofoil craft is Shupramarl type with good stability. I think that it can easily make the hydrofoil craft when it is this method. However, a slight balance of the area, the angle, the impellent, and the weight of the hull of the hydrofoil is necessary for the hydrofoil craft of the model. It is necessary to make it run making it, and it adjusts, it cuts, and to try in the result. I think that it also studies the student by the process.
PS :BBS server of this is up-loaded and the image cannot be up-loaded by full!!. Therefore, please give your E-mail Address.
The image is sent to that.
This concludes my report.

“,”2005-01-08”,”yoichi takahashi “,”nopswd”,” “,””,”0″

“48”,”760908″,”7″,”propose simple model hydro foil||760908″,”Hi! Conor Davies san
I am a modeler of the radio controller ship of Japan.
I propose the idea of the hydrofoil craft that remodels the electric model boat marketed to you.
The hydrofoil craft is Shupramarl type with good stability. I think that it can easily make the hydrofoil craft when it is this method. However, a slight balance of the area, the angle, the impellent, and the weight of the hull of the hydrofoil is necessary for the hydrofoil craft of the model. It is necessary to make it run making it, and it adjusts, it cuts, and to try in the result. I think that it also studies the student by the process.
PS :BBS server of this is up-loaded and the image cannot be up-loaded by full!!. Therefore, please give your E-mail Address.
The image is sent to that.
This concludes my report.

“,”2005-01-08”,”yoichi takahashi “,”nopswd”,” “,””,”0″

“49”,”760904″,”7″,”propose simple model hydro foil||760904″,”Hi! Conor Davies san
I am a modeler of the radio controller ship of Japan.
I propose the idea of the hydrofoil craft that remodels the electric model boat marketed to you.
The hydrofoil craft is Shupramarl type with good stability. I think that it can easily make the hydrofoil craft when it is this method. However, a slight balance of the area, the angle, the impellent, and the weight of the hull of the hydrofoil is necessary for the hydrofoil craft of the model. It is necessary to make it run making it, and it adjusts, it cuts, and to try in the result. I think that it also studies the student by the process.
“,”2005-01-08”,”yoichi takahashi “,”nopswd”,” “,””,”0″

“50”,”760245″,”7″,”simple hydrofoil plans?||760245″,”Hello,

I am a physics teacher in Harrogate, England. Some of my students have been asking about building a model hydrofoil boat, powered by some batteries and a small electric motor.

Our main difficulty is finding simple, understandable plans for the hydrofoil part itself, (materials to use, angles of attack, dimensions, position on hull etc.)

The boat will be fairly small and the hydrofoils will have to be simple, i.e. no moving surfaces.

Is this type of project possible? Are the hydrofoils easy to construct? Do such plans/instructions exist?

I would be grateful for any advice you can give or any websites you can point me to for information.

Ideally I would then send the students off to research further and come up with a project plan.

Thanking you in advance for any assistance.


Conor Davies”,”2005-01-06″,”Conor Davies”,”members”,” “,””,”0″

“51”,”755708″,”7″,”Thank you! Barney||755708″,”Thank you! Barney san. — I am very glad to put a picture on BBS with your help . The sequel of the Pegasus manufacture is also due to be reported from now on.”,”2004-12-25″,”yoichi takahashi “,”nopswd”,” “,””,”0″

“52”,”755619″,”7″,”Photos: PHM Model in Progress||755619″,”Click the following link to see photos of this model under construction:”,”2004-12-24″,”Barney C Black”,”poopdeck”,” “,””,”0″

“53”,”755397″,”7″,”Jetfoil Dimensions, Plans, Profiles||755397″,”I have posted information about Jetfoil dimensions, plans, profiles, fittings, hull access openings, etc. that may be of interest to people who want to model this vessel. The information shows differences between Model 929-100 (Hull Numbers 001 thru 0010) and 929-115 (0011 and on). Go to the following webpage to find the link:”,”2004-12-23″,”Barney C Black”,”poopdeck”,” “,””,”0″

“54”,”754247″,”7″,”Local Interest in Hydrofoil/Portland, Oregon||754247″,”I am interested to form a local activity group here in Portland, Oregon.
This can be informal and maybe those people interested could meet once a month. My interests are as follows:

1) Historical Issues
2) Theoretical and computational aspects related to
hydrodynamics and hydrofoils in particular

This message was motivated by the most recent article on model development of radio controlled hydrofoil boats. In particular the one by Aimee Eng and Cliff Shaw.
Please feel free to contact me at:

With regards, Axel Mainzer Koenig”,”2004-12-20″,”Axel Mainzer Koenig”,”nopswd”,” “,””,”0″

“55”,”753597″,”7″,”Under RC Pegasus construction||753597″,”The radio control hydrovane patrol guided missile (Pegasus) which I am building now is introduced. I think that I wants to reproduce sailing of Pegasus of an active-service time with S= 1:50 and the hull RC made from a full length =800mm balsa. It is a brave figure again !”,”2004-12-18″,”yoichi takahashi “,”nopswd”,” “,””,”0″

“56”,”735242″,”7″,”Re: Introduction of my R/CHydrofoilsModels ||735242″,”Hello1 Wolfgang Lam san
Your mail was read.
Thank you for having my radio control jetfoil praised.
and Although I have understood your intention generally, there is a
point which is not known well yet. There is a question. Do you want to
develop an amphibious, completely new hydrofoil type radio control
automobile model like the image data of a trial product? . Or do you
want to develop the radio control scale model of the jetfoil high-speed
pure Boeing ship? . I have not done understanding which it is yet.
Please give me the reply of the above question. Above
— “,”2004-11-09”,”yoichi takahashi “,”nopswd”,” “,””,”0″

“57”,”735236″,”7″,”Re: Introduction of my R/CHydrofoilsModels ||735236″,”Hi! Wolfgang Lam san
I to the E-mail by which it came from you put once again the contents of the reply taken out to Fri and 05 Nov 2004 repeatedly here last week.
— “,”2004-11-09”,”yoichi takahashi “,”nopswd”,” “,””,”0″

“58”,”735168″,”7″,”Re: Introduction of my R/CHydrofoilsModels wo||735168″,”Dear Yoichi Takahashi san

So excited receiving your message, it is so great meeting you Hydrofoil Jetfoil lovers. In our mail, you mentioned that you have replied last Saturday. I think I missed it, did you send directly to my e-mail account or post it on IHS message board ? Do you mind send it over again, are there more photos/video that you would like to share with us ?

We are a small radio toy manufacturing company and have been manufacturing such for Taiyo and Tamiya. Recently we want to develope a Hydrofoil or Jetfoil toy, of course, cost is a very important factor as our marketing sector is in toys but not hobbies that we would be excited if we can find working partners for consultation or joint venture.

If you have any suggestions, we would be delighted to hear.

Thanks and rgds,

Wolfgang Lam
“,”2004-11-09″,”Wolfgang Lam (Hong Kong)”,”nopswd”,” “,””,”0″

“59”,”734680″,”7″,”JETFOIL model||734680″,”Good evening!
. Wolfgang Lam san It is very interested in your project.
Since the mail from you was contained in my mail last weekend, although I was allowed to ask a question, has it arrived? Since there was writing when it visited the IHS board today, it is replying also by this IHS. Now, development of my RC jetfoil model took in three years. Many were repetitions of an experiment, a try, and an error. All rejection type hydrofoils are very difficult things, such as stability, maneuverability drivability, and a propultion system, so much. I was able to acquire some physical numerical values and know-how required for a design by this development. If your picture is seen, some subjects can see. Selection of a water jet system etc. needs a design and technical choosing the optimal for the area of in-its-hands wings, form, a control system, and propultion. Moreover, weight, the hydrovane for stability reservation, the size of a hull, etc. serve as a conclusive factor. The theory and the solution method of a model are a method of at a model. Above”,”2004-11-08″,”yoichi takahashi “,”nopswd”,” “,””,”0″

“60”,”732651″,”7″,”Re: Invite modeller on Jetfoil project||732651″,”Your photos are most interesting. Take a look at the Flying DUKW on my webpage at”,”2004-11-04″,”Barney C Black”,”poopdeck”,” “,””,”0″

“61”,”732178″,”7″,”Source of RC Hydrofoils||732178″,”I see used RC Hydrofoils come up for auction on from time to time.”,”2004-11-03″,”Barney C Black”,”poopdeck”,” “,””,”0″

“62”,”732176″,”7″,”Re: Introduction of my R/CHydrofoilsModels wo||732176″,”Mr. Yoichi Takahashi san

My name is Wolfgang Lam from Hong Kong, I saw your beautiful Jetfoil model picture and your introduction, they looked brilliant.

We would like to invite you participate in our project of re-modelling an amphibian toy car to a Jetfoil using centrifugal fan for the waterjet propulsion system.

The car measures about 360 x 140 mm, estimated payload is around 1100 gm with motors, servos, battery etc.

I am attaching a photo for your quick browsing and if you are interested in know more, I can send you movie file of size about 10 MB.

Looking forward to hear you again.

Tks n Rgds”,”2004-11-03″,”Wolfgang Lam (Hong Kong)”,”nopswd”,” “,””,”0″

“63”,”732116″,”7″,”Jetfoil Hydrofoil modelling||732116″,”Hi, all Jetfoil Hydrofoil lovers We are looking for helper to re-constructing an amphibian toy car into a Jetfoil, it measures about 360 x 140 mm, estimated payload is 1100 gm with batteries, motors, servos. Attached is a slide/video clip which shows real one flying and the car standing on its struts. Thank you “,”2004-11-02″,”Wolfgang Lam (Hong Kong)”,”nopswd”,” “,””,”0″

“64”,”731709″,”7″,”Invite modeller on Jetfoil project||731709″,”Please see attached for another photo of the (ex amphibian car) for rebuilding into a Jetfoil.


Wolfgang Lam”,”2004-11-02″,”Wolfgang Lam (Hong Kong)”,”nopswd”,” “,””,”0″

“65”,”731698″,”7″,”Invite modeller on Jetfoil project||731698″,”Hi, Jetfoil/Hydrofoil lovers

We would like to seek a helper for building a Jetfoil model from a toy ship hull (an ex-amphibian car) using a centrifual fan as the propulsion system, the toy ship hull measures 360 x 140 mm, estimated payload with batteries, motors, servos etc is 1100 gm.

We can send you the hull, the fan, and required motor for assembling.

Please see attached photos of the ship hull with the centrifual fan and posted on its 3 struts.

Thank you”,”2004-11-02″,”Wolfgang Lam (Hong Kong)”,”wavecon”,” “,””,”0″

“66”,”722798″,”7″,”Looking for.||722798″,”Is there anyone that is selling RC Hydrofoils?”,”2004-10-13″,”Jim Myers”,”nopswd”,” “,””,”0″

“67”,”721717″,”7″,”hydro foils for kiteboard||721717″,”I have recently competed in Weymouth speed week on a kitesurf kite and standard board and have posted a speed of 30.97 knots.
I wish to increase the speed and the only thing I believe is stopping me is the boards resistance. I wish to try out hydrfoils on my board that will lift the board approx 5-10 cm off the surface of the water. I have thoght about using hydrfoils off model boats.
The hydrofoils will have to be made of metal I think. Has anyone got any suggestions of where I could get such things from or made?
The board I am using is 130cm long and 37cm wide.
I look forward to your suggestions
Richard Gowers
Uk”,”2004-10-11″,”Rich Gowers”,”nopswd”,” “,””,”0″

“68”,”709950″,”7″,”Re: Tucumcari Model e-bay||709950″,”Here is a third Tucumcari Model.
It says a couple pieces are missing.
Item Number 5921479181″,”2004-09-16″,”Aimee Eng”,”nopswd”,” “,””,”0″

“69”,”708393″,”7″,”Another Tucumcari Sept 13th, 2004||708393″,”Here is another e-bay auction for one of these model kits.

or Item Number 5920973946″,”2004-09-13″,”Aimee Eng”,”nopswd”,” “,””,”0″

“70”,”703922″,”7″,”Re: board ease of use||703922″,”Aimee

We have tried to make to make the board a little simpler to use. If we messed up and made it worse, let me know what bothers you and we can fix it.

Bill White
Moderator”,”2004-09-03″,”Bill White”,”foilsadm”,” “,””,”0″

“71”,”703833″,”7″,”Tucumcari Model e-bay||703833″,”If anyone is interested, there is an Aurora model of the Tucumcari on e-bay.
Item number 5918286328


(did this bbs get more difficult to access since I was last here?)”,”2004-09-03″,”Aimee Eng”,”nopswd”,” “,””,”0″

“72”,”694827″,”7″,”want to take lease russian hydrofoil||694827″,”Falcon sea trans company would like to lease russian built hydrofoil if u have any information please mail me as soon as possible”,”2004-08-15″,”Ruman Barua”,”nopswd”,” “,””,”0″

“73”,”689422″,”7″,”Introduction 2 my R/CHydrofoilsModels||689422″,”Konbanwa Takahashi san,

Here are the fiberglass struts after one week of work.
The Struts came out very well and I am happy with the work.

The right strut is still solid, with the foam core still in place.
The left strut has had the foam melted out with acetone.

I will reinforce the uptake with a vertical piece of styrene, This will also help keep the water running straight as it passes through the strut.

Mata aimasho,

Aimee Eng.”,”2004-08-04″,”Aimee Eng”,”nopswd”,” “,””,”0″

“74”,”688884″,”7″,”Introduction 2 my R/CHydrofoilsModels||688884″,”I have decided to try to fiberglass the rear struts.
Here are the foam cores fiberglassed and vacuum bagged.
“,”2004-08-03″,”Aimee Eng”,”nopswd”,” “,””,”0″

“75”,”684342″,”7″,”Introduction 2 my R/CHydrofoilsModels||684342″,”konbannwa! Aimee.Eng
. The thin aluminum board which constitutes the strike rat is pasted up by epoxy adhesion material. Since it is very difficult, aluminum welding is not used. Above”,”2004-07-25″,”yoichi takahashi “,”nopswd”,” “,””,”0″

“76”,”683895″,”7″,”Introduction 2 my R/CHydrofoilsModels||683895″,”Konbanwa Takahashi san,

How did you assemble the aluminium plates?
Is the aluminium TIG welded or epoxied(glued) into shape?

I am Sailing boats this weekend, So no new work until next week.

Mata ne.”,”2004-07-24″,”Aimee Eng”,”nopswd”,” “,””,”0″

“77”,”683816″,”7″,”Introduction 2 my R/CHydrofoilsModels||683816″,”konnichiwa!. Aimee Eng san
The struts is made with the 0.3‚‚ thin aluminum board in order to serve as a waterway duct. Foil is shaving and making ramin wood to the wings type.
“,”2004-07-23”,”yoichi takahashi “,”nopswd”,” “,””,”0″

“78”,”683143″,”7″,”Introduction 2 my R/CHydrofoilsModels||683143″,”konbanwa Takahashi san,

The temperature is 26-32C here.
The planking is 1.5mm balsa wood. After sanding the hull lost 20 g but I am trying to smooth the hull right now so it may stay about 290g when finished. Hopefully your diagrams and pictures will keep this project from taking three years to complete.

I am not sure I understand the joint development question.
Is that you helping me develop my model? I welcome your help.
Also, I would be happy to help anyone start or build a model if it is within my means.

I am thinking that I will build the jet pump not buy one.
How did you build your struts?
Are the struts and foils balsa?
“,”2004-07-22″,”Aimee Eng”,”nopswd”,” “,””,”0″

“79”,”682771″,”7″,”Introduction 2 my R/CHydrofoilsModels||682771″,”CONBANWA. Aimee Eng san!

This place, intense heat continues every day, and, as for Japan, it is very hot (39-degree Centigrade). You live. How are
and the temperature at the time? . It is leaf surprise at the speed of your modeling speed! Thank you for showing a beautiful hull. Judging from a hull size, the almost same size as my hydrovane patrol guided missile is conjectured. Getting, if you say, a jet pump and a hydrovane think that they are difficult to be sure. Finishing as lightly as possible is important for a hull. Mind should attach to seldom become weight over just because it thinks a feeling of a scale as important. By the way, is the Planck wood of a hull a balsa? The jet pump spent also for me to research and development in three years. Although the jet pump for models out of which electric power comes was looked for among the world, there is anywhere, and it was made personally. [ no ] Then, although it is a proposal, how is collaborating on your on-going R/C MODELE-SUPABIERO class by two persons? Mutual favorite technology is shared and it is international joint development. If you avoid, since it may offer the technology of an electric jet pump and I will also want to have subject nature as a modeler which plays an active part internationally.
Please inquire.”,”2004-07-21″,”yoichi takahashi “,”nopswd”,” “,””,”0″

“80”,”682646″,”7″,”Re; RHS 160 F- Foil Arrangement||682646″,”Well apparently there are some file limits for accounts so if you need a larger file of the RHS140 plans e-mail me, and I will send you the best copy I have.

Also, I have not extrapolated any frame/station drawings for the 140 series yet, so that information is not available at this time.”,”2004-07-21″,”Aimee Eng”,”nopswd”,” “,””,”0″

“81”,”682641″,”7″,”Re; RHS 160 F- Foil Arrangement||682641″,”How about an RHS 140
(Courtesy of Martin Grimm)

Perhaps you can modify the superstructure, length and beam to match the RHS 160″,”2004-07-21″,”Aimee Eng”,”nopswd”,” “,””,”0″

“82”,”682329″,”7″,”Introduction 2 my R/CHydrofoilsModels||682329″,”Ohaiyo Takahashi san,

Building a boat hull is the easy part. (Boat hull wa muzukashii ku nai.)
Building the jet pump and foils will be difficult. I would like to make this electric powered. Any assistance will be greatly appreciated. (Jet pump to foils wa taskete onegaishimasu.)

The Sparveiro class is
Length x width x draught
23m x 7m x 1.5m

The model is
637mm x 185mm x 40mm
Currently the rough fiberglass hull weighs 288.5g
I will sand it and finish the hull today.

Aimee Eng

Here is todays hull image
“,”2004-07-20″,”Aimee Eng”,”nopswd”,” “,””,”0″

“83”,”682268″,”7″,”Introduction 2 my R/CHydrofoilsModels||682268″,”CONBANWA! Aimee ENG san

Thank you for having the picture of your spa BIERO class shown. By the way, is the speed of your work very Quicly? . Would you teach the size of the scale of a hull, and the full length of an actual ship, if it avoids? Is it engine? Is it an electric motor drive? . Above”,”2004-07-20″,”yoichi takahashi “,”nopswd”,” “,””,”0″

“84”,”682267″,”7″,”Introduction 2 my R/CHydrofoilsModels||682267″,”CONBANWA! Aimee ENG san

Thank you for having the picture of your spa BIERO class shown. By the way, is the speed of your work very Quicly? . Would you teach the size of the scale of a hull, and the full length of an actual ship, if it avoids? Is it engine? Is it an electric motor drive? . Above”,”2004-07-20″,”yoichi takahashi “,”nopswd”,” “,””,”0″





Archive; Model Kits, TUCUMCARI/Others

Click below to Open
[Date/Time=03-24-2002 – 3:15 PM] [Msgid=237685]
Archive; Radio-Controlled Hydrofoil Models
Click below to Open
[Date/Time=03-24-2002 – 3:22 PM] [Msgid=237690]
Flying Keelboat

      • microSAIL! (

      • ) ia about to introduce a revolutionary RC sailing model: the aeroSKIFF. This boat is the first production model sailboat to be offered with a canting keel which is very fast: 0 to 52 degrees in one second. Most revolutionary of all is that the boat is also available with hydrofoils(!): one on the daggerboard just ahead of the canting keel strut and one on the rudder(thats right–only two!). She uses a variation of Dr. Sam Bradfieds altitude control system. So far as we know the aeroSKIFF is the FIRST BALLASTED KEELBOAT–either model or fullsize to fly on fully submerged foils(or any other kind of foils). We are pursuing a patented version of this model technology for use on full size boats like Open 60’s…
      • If you have ever heard of or seen –and can substantiate it-another keelboat on foils please contact Doug Lord at:

      • The aeroSkiff pictures will be posted on our website in a month or so…

[Date/Time=04-21-2002 – 12:56 PM]

Name:Doug Lord, [Msgid=249867]
PHM Radio Controlled Model


      • For those interested in the model of the


      • (PHM-4) by Ronald Swart, Look at:

      • .
      • When more info shows up, I will make a update.

[Date/Time=05-12-2002 – 7:56 AM]

Name:Mark van Rijzen, [Msgid=258425]
PHM Radio Controlled Model

      • Additional photos provided to IHS by Mark

[Date/Time=05-22-2002 – 9:02 PM]

Name:Barney C. Black, [Msgid=262735]
Test Rig for R/C Model CURL CURL


      • See the image of my model R/C hydrofoil with a ‘test rig’ catamaran owned by a friend of mine (pictured). Actually, the catamaran has been used for solar boat races in recent years but is ideal for towing models. The idea was that this could be used to do experimental tests of transverse stability of the model while foilborne on a calm day. We just have not got far enough with the idea yet! Far more ideal of course would be to perform the tests in a towing tank! — Martin Grimm (

      • )

[Date/Time=05-27-2002 – 6:35 PM]

Name:Martin Grimm, [Msgid=264347]
Wing In Ground Effect Models

      • Wing In Ground Effect Models
      • Dear W.I.G enthusiast
      • This is just a note to tell you that I have added some more photos of WhizzyWig models to my web site, which you might like to see.
      • Visit :

      • or go direct to the WhizzyWig Gallery :

      • to see the pictures.
      • Also a new video clip of the prototype WhizzyWig XGE, flying in XGE mode (eXtreme Ground Effect) has been added to the Video section of The Wig Page, visit:

      • If you would like a set of plans to build your own WhizzyWig model see the details at :

      • , or email me and ask for an order form for the WhizzyWig XGE Plans Pack.
      • I hope you enjoy the photo.

      • Regards
      • Graham Taylor

      • Date=2002-05-29 for Graham Taylor

[Date/Time=05-31-2002 – 1:29 PM]

Name:Graham Taylor, [Msgid=265985]
How Small Can You Go?


      • Is it possible to make a working foil less than 10mm from leading edge to trailing edge that would be suitable for a small saing model say <40cm long overall? If it is possible what would be the best cross section and angle of the foil and would a T foil configuration work at this size? Also to make it at all effective how light would the model have to be?

[Date/Time=07-12-2002 – 4:25 PM]

Name:Matthew Lingley, [Msgid=281832]
How Small Can You Go?

      • Matthew,
      • I think it would be possible to build a sailing hydrofoil model of only around 40cm long and with hydrofoil chord lengths of less than 10mm, but you would have to take a lot of care to make it work, especially to keep its weight down to the bare minimum. I can’t imaging anyone else would have made such a small sailing hydrofoil before.
      • A more workable size for a sailing model would be like the MicroSail F3 (see:

      • ) which is 1.4 metres (55.75 inches) long. Building to that scale means shaping and assembling the components doesn’t become so fiddly.
      • If you were to attempt a 40cm long model of a similar arrangement to the F3, then the weight budget you have to work with can be estimated by scaling down from particulars of the F3 model. This model has a weight of up to 8.2 lb or 3.7 kg. If you try to build a model only 28% of the size of the F3, then its weight would have to be about 86 grams!
      • An inverted T foil system as on the F3 required foil control to regulate the angle of attack of its foils. The weight of such control linkages alone would cause problems. As such, for a small sailing hydrofoil you would be far better off using surface piercing hydrofoils that don’t require foil angle control (explore our website for more details of the differences between folly submerged and surface piercing hydrofoil types).
      • Furthermore, the model would have to be free sailing as even the lightest radio control equipment would make it too heavy.
      • A final aspect to consider: As boats become smaller, the frictional resistance coefficient of their hulls (or foils) becomes higher. This means that although they have less wetted surface area that is subject to friction, they still suffer from a relatively larger amount of resistance in proportion to their weight.
      • Although a smaller model may seem more manageable to build, in this case you would be better off adopting a larger model as there is a better chance you will be able to make it work well.
      • I don’t have any good tips to offer you about the best foil cross section and angle except that the best lift to drag ratio of most aerofoils and hydrofoils is achieved at a relatively small angle of attack (around 3-4 degrees?) and you should be aiming for that angle.
      • I wish you well with your hydrofoil modelling.

[Date/Time=07-13-2002 – 3:36 AM]

Name:Martin Grimm, [Msgid=281949]
Thunderstreak Collection


      • I visited your site, and was surprised to see a reference to the old ThunderStreak model on your page at

      • ! I thought you might get a kick out of my collection.

[Date/Time=07-25-2002 – 5:13 AM]

Name:Mark, [Msgid=286201]
Thunderstreak Collection

      • Mark
      • thanks for the great photo
      • Bill White

[Date/Time=07-27-2002 – 5:04 PM]

Name:bill white, [Msgid=287225]
PHM model up for sale!!


      • Announcement!!!
      • A friend of my is selling his PHM model.

      • This is a Radio Controlled model of the USS Aquilla.
      • The buyer will not get the model only,but also the mould to make a new PHM hull.
      • And a lot of information.(photo’s drawing enz..)
      • The model is build according to the original drawings of the Boeing company.
      • In a scale of 1:30,
      • this makes her length 135 cm,
      • beam 48 cm,
      • and the weight is 14 kg.
      • Hull is made of kevlar,deck,deckhouse and foils are made of aluminium.
      • Need some detail work.
      • Asking price is $3000,- USD,
      • That is for:
      • Model,mould,photobook,drawings and shipping.

[Date/Time=08-07-2002 – 4:26 PM]

Name:Capt Mark van Rijzen, [Msgid=292219]
Attached File  “” – size 26604   Click Here To Download
PHM model up for sale!!

      • WoW! I’ve contacted the owners (and perspective owners) of the remaining PHM’s. Ever thought about “Super Sizing” and buying one of the originals….?

[Date/Time=08-10-2002 – 12:41 AM]

Name:Dan Schmidt, [Msgid=293848]
Test Rig for R/C Model CURL CURL

      • I recent received an e-mail enquiry seeking more details about the ?test rig? boat and whether it could be used for model testing work.
      • The photo in the original posted message on this subject was taken earlier this year and is the only time we have attempted to tow the hydrofoil model using the catamaran so far. It was really just an idea prompted by the fact that it is difficult to gain access to towing tank facilities (though the hydrofoil model in the photo has been tested in the towing tank at the Australian Maritime College in Launceston as a research activity some years ago).
      • The idea of using a boat as a means to test scale models for assessment of their performance is not a new one. I have video footage that shows that a Volga sports hydrofoil (see the website for details of this craft type) was once used by Rostislav Evgenievich Alekseev (again, see website for more info) and the Central Hydrofoil Design Bureau in the former Soviet Union to test the characteristics of Wing-in-Ground-Effect craft (Ekranoplans) using small scale models. In that case, the model was simply towed from a bar projecting out from the side of this small 6 seater hydrofoil and was towed via a thin towline. These tests were probably conducted to examine flight stability and other such issues. A more dedicated self-propelled model test platform was designed by the Gdansk Ship Research Institute in Poland and is described in the 1974-75 issue of Jane’s Surface Skimmers. This was known as the Badacz II and was of a hydrofoil supported catamaran configuration with the towing rig installed at the bow. It was apparently used for testing of hydrofoil and hovercraft models. Taking the idea to extremes, Boeing used the hydroplane ‘Aqua-Jet’ to test hydrofoil models at high speed, reportedly up to 100 knots. I am also aware that a consulting naval architect in Australia has used a larger boat for testing of scale models of conventional vessels and others have probably also done so.
      • Our catamaran called ?Ampcat? is not highly instrumented. On the occasion of the trial run towing the hydrofoil model, we had a small hand held GPS unit on board. It could measure speed over ground fairly well (but how accurately, I can’t say). We had also fitted a very basic Pitot tube that was roughly marked off with speeds in half-knot increments. The instrument was simply manufactured from a length of Perspex tube heated and bent into an L shape with the lower opening facing forward into the oncoming water flow and the upper end open to atmospheric pressure. The stagnation pressure at the front of the tube results in a column of water within the Pitot tube, which rises above the mean water level. This in theory should measure speed through the water but again; I can’t say how accurate it is in practice. The towing force could be measured using a simple spring balance (more tension in the tow line results in extension of a spring) combined with a calibrated scale to make it possible to read off the tow force. This is a simple visual scale and naturally if the boat and model are not in calm water, the tension will fluctuate and readings will be difficult to record. The intention was to mount a video camera near the model to record pitch or roll motions if the tests are conducted in waves. The approach was to do everything on a shoestring budget as this is only a personal interest rather than a commercial enterprise.
      • Ampcat can comfortably reach 6.5 knots via a battery powered electric outboard motor. If it is towing a 1:20 scale model as in the photo, that speed corresponds to a full scale speed of the hydrofoil of about 29 knots based on Froude Number.
      • Testing of scale models of ships and boats to estimating resistance of the full scale vessel is established practice in the maritime industry, however you need to be quite familiar with scaling techniques and extrapolation methods to reliably predict the full-scale performance. That is even more complicated in the case of a hydrofoil than a conventional vessel. Designers, including in the hydrofoil business, have been ‘burned’ by not getting their model scaling techniques quite right. There are no shortages of craft that have under-performed on full-scale trials despite what the model tests may have indicated.

[Date/Time=08-11-2002 – 6:18 AM]

Name:Martin Grimm, [Msgid=294217]
PHM model up for sale!!

      • I am interested in seeing a built model — not buying one. Anyone have one living on the eastern portion of USA?

[Date/Time=08-11-2002 – 7:32 PM]

Name:Gerry Levine, [Msgid=294364]
PT-50 Model


      • I am Japanese, and I am a fan of hydrofoil boats in Japan inland sea. I made a model of hydrofoil boat PT-50.

[Date/Time=08-18-2002 – 1:08 PM]

Name:Katsuhiro Sakai, [Msgid=297592]
PT-50 Model

      • Katsuhiro
      • The detail of the model is impresive. It is very hard to tell from your enclosed pictures that we are looking at a scale model.
      • Congratuations on your fine workmanship.
      • Bill white

[Date/Time=08-18-2002 – 10:12 PM]

Name:Bill White, [Msgid=297759]
PHM model up for sale!!

      • Why do you ask about owning a model in northeastern US?

[Date/Time=08-18-2002 – 11:30 PM]

Name:Dan Schmidt, [Msgid=297791]
Bras D`Or Model Question


      • I am a master seaman instructor at the fleet school in Victoria, BC.
      • I belong to a Radio Control boat club and am looking for a little
      • information or pictures on Bras D’Or. I wanted to know if there are rudders on the aft stabilizers, or is the ship steered by just the front foil? I have just completed a four foot CPF with working lights and radars. I have been told by numerous persons that the FHE 400 could not be made to work. I hope that you can help me out.

[Date/Time=08-20-2002 – 4:45 AM]

Name:C.T. Thomas, [Msgid=298311]
Bras D`Or Model Question

      • The IHS has a large Section on the Bras D`Or at

      • It indicates that the bow foil was used for foilborne and hullborne steering.
      • The The Defence R&D Canada – Atlantic’s mandate is to conduct research and development in Underwater Sensing and Countermeasures, Naval Command and Control, Air Platforms, Naval Platforms etc. They did trails on the Bras D`Or in the 60’s and 70’s. There is some information on their web site in the History section.

      • See also: Back to the Canadian Navy – Postwar Fleet

      • Also: If you go to IHS main home page and use the IHS Site search engine you will come up with 14 items addressing Bras D`Or both technical and historical.
      • Hope this helps.
      • Bill White

[Date/Time=08-21-2002 – 9:45 AM]

Name:Bill White, [Msgid=298902]
Bras D`Or Model Question

      • Following up on what Bill has already said, the whole bow foil assembly rotated about a vertical stock similar to a rudder stock. This was supported within a Teflon coated spherical bearing near the keel. This arrangement allowed the bow foil incidence angle to be adjusted by a hydraulic ram positioned just below the weather deck in the bow area. A steering actuator was positioned at the level of the spherical bearing with the control linkage projecting out of the Port side of the hull below the hullborne waterline.
      • To help with building a model, the book “The Flying 400” by Thomas G. Lynch would be very useful to you. This has many good photos and diagrams. Full details are available on the IHS website “Popular Books on Hydrofoils” page. Of course you could also visit the real thing on display in Quebec to see all the details first hand!
      • All the best with the modelling project.

[Date/Time=08-22-2002 – 9:48 AM]

Name:Martin Grimm, [Msgid=299478]
Looking for RC Coke Hydrofoil


      • I am looking for the RC Coca-Cola Hydrofoil that was made in Japan. I can’t seem to find them anywhere. I believe they were made back in the ealy 90’s. They were not sold in US. Can anyone help?? Will pay a finders fee of $200 if someone can locate one for me to buy. Thanks.

[Date/Time=08-28-2002 – 6:26 PM]

Name:Barry Miller, [Msgid=302505]
Looking for RC Coke Hydrofoil

      • I had not heard of these models, but I will post your message in our announcements page to give you a second shot at connecting with someone. If you have a photo or sketch of this model, we would like to have it for our photo gallery.

[Date/Time=09-04-2002 – 8:58 AM]

Name:Barney C Black, [Msgid=305241]
PT-50 and PT-20 Models (Manly)


      • There are detailed plans of the PT 50 Hydrofoils in the State Archives at Kingswood NSW.
      • I built a 1:25 scale static model of the Manly II PT 20 Hydrofoil (see below). I have the complete plans of both the Japanese version & my version. I also have full plans of the Hydrofoil “Fairlight”.
      • I would love to build scale models of both the Dee Why & Curl Curl Hydrofoils.

[Date/Time=09-14-2002 – 7:42 PM]

Name:Alex, [Msgid=309777]
PT-50 and PT-20 Models (Manly)

      • When the Sydney hydrofoils were decommissioned by the State Transit Authority I made enquiries at their Balmain workshops about whether surplus plans could be made available, even if just to copy. I didn’t have success at the time, though there was a hint that they would at least not just ‘ditch’ the information. I am pleased to hear that at least the PT 50 hydrofoil plans are available in the state archives and some day I may obtain a copy for my own information. I wonder whether the same applies for the PT 20, RHS 140 or RHS 60F types and the alternative variant of the PT 50 (since some had the raised wheelhouse arrangement).
      • The Japanese (Hitachi) had a variety of superstructure configurations for the PT 20s they built under license to Supramar. For Manly they incorporated the panoramic windows. Others were built with ‘standard’ windows throughout. For other variants there was a small exterior area for use by a limited number of passengers behind the wheelhouse.
      • The plans I prepared for my ‘Curl Curl’ model were based on fairly small scale published arrangement drawings of the type, suitably modified to reflect the peculiarities of the superstructure of ‘Curl Curl’ itself. These plans were further refined by reference to a collection of photos I had taken of ‘Curl Curl’. I have never properly completed the plans for use by others, as in fact I have many loose templates and sketches of details from which I also worked. My intention was always to finish off those plans as a basis from which others could have an easier start into building a hydrofoil model. One day I would like to put in the time to finish the drawing work.
      • Of course, I would also be keen for someone to take on a project to model ‘Dee Why’ or ‘Palm Beach’ since I am unaware of anyone who has taken on those as model subjects (both these two had the raised wheelhouse similar to ‘Curl Curl’ but instead were PT 50s). I am sorry to say I have fewer photos or postcards of those two hydrofoils (none of my own), let alone drawings of that version. You could however adapt the ‘Fairlight’ drawings you have managed to obtain (presumably from the state archives?) with the help of any photos you can get.

[Date/Time=09-14-2002 – 7:49 PM]

Name:Martin Grimm, [Msgid=309781]
PT-50 and PT-20 Models (Manly)

      • Hello,
      • I am a Hong Kong people.
      • I was interseting in this model for few years.
      • I have to plan for build it,but here have not enough information for build it ,also I not have quility to build it.
      • I want to ask you that will you sell it ?

[Date/Time=09-22-2002 – 4:08 PM]

Name:Anthony Choi, [Msgid=313028]
PT-50 and PT-20 Models (Manly)

      • Hello,
      • I am a Hong Kong people.
      • I was interseting in this model for few years.
      • I have to plan for build it,but here have not enough information for build it ,also I not have quility to build it.
      • I want to ask you that will you sell it ?

[Date/Time=09-22-2002 – 4:09 PM]

Name:Anthony Choi, [Msgid=313029]
PT-50 and PT-20 Models (Manly)

      • Hello,
      • I am a Hong Kong people.
      • I was interseting in this model for few years.
      • I have to plan for build it,but here have not enough information for build it ,also I not have quility to build it.
      • I want to ask you that will you sell it ?

[Date/Time=09-22-2002 – 4:12 PM]

Name:Anthony Choi, [Msgid=313030]
About PT-50 model


      • Now I am looking for a model of PT-50 Hyfrofoil.It is made in Japan model company which call Gunze Sangyo.If anyone can locate me to buy the model or directly sell to me .I can give a higher price for you.
      • P.s.If anyone can find it ,please send a e-mail to me.
      • Thanks.

[Date/Time=10-12-2002 – 8:38 AM]

Name:Antony Choi, [Msgid=322522]
About PT-50 model

      • Try eBay. It is amazing how many out of production model kits can be found there.

[Date/Time=10-13-2002 – 11:18 AM]

Name:Greg Bender, [Msgid=322911]
PHM / Jetfoil Model Plans

      • I’m the person with the Jetfoil mouldings, of HMS Speedy 929-320 and the commercial 929-115-100. I’ve been working on the jetfoil model for many years, and I will soon be able to have a model fully working with ACS (My models of Jetfoil and PHM are 4ft / 1.2 m long).
      • I worked with Martin Seymour on his model back in 1985. Jetfoil or PHM require the same type of system for automatic control. I have now sourced the outlets for Jetfoil control and hope soon to be testing. Back in 1985, there was a lack of knowledge of the systems for control, but these systems are now available. I expect to have some positive news in the spring of 2003 so watch this space. Also available will be mouldings for PT50, PT75, RHS 150/160/200 + PHM, complete and ready to run.
      • I can confirm that I have all of the workshop manuals of Boeing Jetfoil and drawings. The ACS has been in my blood for years, and I have had a major breakthrough in the past few days.
      • I am able to give advice on all aspects of Jetfoil and PHM for modeling.

[Date/Time=11-02-2002 – 12:03 PM]

Name:Peter Cahill, [Msgid=332437]
Microsail Link


      • Was surfing your web site and thought your photos were excellent.
      • I sail radio controlled 12 Meter yachts in Orlando Florida. A friend and designer who lives here has developed and produced a Tri-Foiler which would be a good thing to add to your collection and web site.
      • Take a look at
[Date/Time=11-22-2002 – 5:14 AM]

Name:Tim Hopkins, [Msgid=341790]
Microsail Link

      • Thanks Tim
      • We appreciate the information and will add information of our links to other sites on our IHS Web pages. It looks pretty impressive.
      • Bill White

[Date/Time=11-23-2002 – 6:41 PM]

Name:Bill White, [Msgid=342527]
600mm hydrofoil


      • I’m a 23 year old sailmaker at North Sails New Zealand. I have been sailing for 18 years. I have been sailing IOM’s for a couple of years. I’m interested in building a 600mm hydrofoil. I know this seems small but there is a competition at work. The rules 600mm max length, 1050mm from top of the rig to bottom of the keel, and it must be a monohull. I have been searching the internet for information about hydrofoils, I’m interested in finding out more about altitude control system but am finding it hard to find something. Are there any tips, hints or anything that would be helpful?

[Date/Time=01-29-2003 – 9:34 PM]

Name:Scott Beavis, [Msgid=369322]
Re; 600mm hydrofoil

      • You should also browse through our email archives on the following page:

      • . In particular you may be interested in two postings entitled “Modelbuilding Scaling Lessons Learned”, one by Martin Grimm, the other by Ernst Zemann ( you will have to scroll down a bit to find these as they date back to December 2000.
      • Good luck with your project, and by all means send us some photos and text for our newsletter when you are done.

[Date/Time=01-29-2003 – 9:36 PM]

Name:Barney C Black, [Msgid=369323]
Re; 600mm hydrofoil

      • You might want to go to:

      • the site for the multiONE(One Meter) website. I know you’re talking about a monohull but there is good info on foils on that site.
      • So far no one has succesfully sailed a hydrofoil monohull KEELBOAT though I am right on the verge of doing so with a boat called “aeroSKIFF”. It has a canting keel for stability and features a mainfoil on the daggerboard and a foil on the rudder–two foils total.(also see:

      • for full size monohulls(without ballast keels) on foils.
      • Another project almost ready for testing is our “microMOTH(working name) that consists of a lightweight narrow 36″ by 4″ main hull and, again, a foil on the daggerboard and one on the rudder and NO ballast keel! For stability this boat uses a 28” wide “rack” with buoyancy pods on the ends to support the boat at rest. There is a debate as to whether it is a monohull or not but I say it is since the buoyancy pods do NOT support the boat when it is sailing.For sailing stabiity up to 3lb is moved across the rack very quickly…
      • Very basic parameters that I know work are: around 50-60 sq. inches of sail for each square inch of main foil area; above a 150 sail per lb. of model displacement. Rudder foil about 1/2 area of main foil; mainfoil +2.5 degrees, rudder foil zero. Altitude control on my first models is MANUAL using a flap on the main foil; the ONE Meter site I mentioned has a description of a version of Dr. Sam Bradfields altitude control system I used (with permission) on the F3 hydrofoil model.
      • Good luck and keep us informed! You can contact me directly at:

      • if you’d like.

[Date/Time=01-30-2003 – 8:47 AM]

Name:Doug Lord, [Msgid=369498]
Re; Re; 600mm hydrofoil

      • Further to the message that Barney had sent you, it would also be worth your while looking at the MicroFoiler F3 model at the MicroSail! website:

      • This 1.4m model trimaran hydrofoil was developed by Doug Lord with the help of Sam Bradfield. The concept could possibly be further scaled down to 600mm and adapted to a monohull arrangement with a cross beam to support the forward pair of foils, if that is permitted. It may however be more practical to adopt surface piercing foils as on the full scale French l’hydroptere (see:

      • ) as these are self stabilizing and so would not need the tiny height sensor wands that you would require with a scaled-down version of a fully-submerged foil design such as the F3.

[Date/Time=02-02-2003 – 11:45 AM]

Name:Martin Grimm, [Msgid=371006]
12 Inch Radio Controlled Hydrofoil


      • This 12-inches in length hydrofoil model was given to me in the early 1960s when I was about 14 years old. The mini hydrofoil was a Vacuum-form hull with plastic foils. The boat was intended to be driven by a simple motor and 2 cells. That was about the time when the James Bond 007


      • film was first shown. The same type of hydrofoil flew in the movie.
      • At that time no radio-control equipment or rechargeable cells of such small size were available yet. On one occassion I was amazed to see another boy free-run the same boat with 8 AA cells flying.
      • I kept this boat as it was for another 30 years before getting around to adding R/C capability. I do not remember which might be the manufacturing company but I am sure it was a Japanese one, and it might be the Model Craft Clipper Co.
      • In the 1990s, I was having fun with mini 1/24 Tamiya cars and later 1/200 Mini-japanese destroyers, radio-controlled of course. One day the childhood dream of making the mini-hydrofoil flies came back, so I started working.
      • First I reinforced the PVC hull with a very thin layer of glass-epoxy. Hull,deck, and cabin were assembled with the boat opened from the canopy of the cabin so as to give the boat 15mm more critical side-wall. Radio-control gears were mounted in the rear section of hull, which was made completely water-proof. A Tamaya black-180 mini motor was soldered to the shaft-tube and geared to the shaft running a KNK 27mm plactic 2-blade propeller. The boat took six 270mah or six 500mah (short-type) cells. The foil was redesigned with adjustable collet soldered first to a thin copper plate then glued to the plastic foil with AA glue. The rudder sat left away from the propeller wash.
      • Today, the boat has been untouched since 1996, and there is still one problem to solve – to make it turn left.

[Date/Time=02-02-2003 – 1:03 PM]

Name:Peter Cheung, [Msgid=371040]
Re; 12 Inch Radio Controlled Hydrofoil

      • Thanks for the photos… I especially like your model test basin. It is not quite as fully featured as the model basin at David Taylor Research Lab, but it does the job, and the price is cheap!

[Date/Time=02-02-2003 – 1:08 PM]

Name:Barney C Black, [Msgid=371043]
Re; 12 Inch Radio Controlled Hydrofoil

      • Very cool model. I would love to see it run. It’s hard to tell from the low quality pictures, does the model have a rudder, or any kind of steering gear? You said you can’t get it to turn left. What appears to happen when you try?
      • Thanks for sharing, Scott Smith

[Date/Time=02-04-2003 – 7:05 AM]

Name:Scott Smith, [Msgid=371915]
See and Hear it Run

      • You can now see (and hear) it run. Peter Cheung kindly provided two video clips of his model in action. These clips are in *.mpg format; each is approx. 1 meg in file size and lasts for 6 seconds.
      • Clip #1:

      • Clip #2:
[Date/Time=02-07-2003 – 8:07 PM]

Name:Barney C. Black, [Msgid=374282]
Buyer (and Seller) Beware


      • Some of the commercially produced hydrofoil RC model kits have been long discontinued and are now quite rare and valuable. Recently, several people who posted messages here were contacted directly by email with an offer to sell a rare such model at a price in the hundreds of dollars. The individual making this offer was not a member of IHS and is not known to us. The offer may be perfectly legitimate. The price may be perfectly fair… IHS has no way of knowing, and we do not recommend or endorse products and services. This seems a good opportunity to remind our valued members and correspondents to be wary of responding to any unsolicited offer to sell valuable merchandise by e-mail. If, due to distance or other reason, you have no way to meet the seller under safe circumstances and see the merchandise before you buy, then you would be ill advised to provide personal information, give out your credit card number, or mail a payment in the hundreds of dollars in such a situation. For the legitimate seller with a valuable model or other item to sell who does not have an established internet business, I would recommend that you sell the item locally where people can view the item in a safe public location before buying. Or you can list your item for sale on eBay or other web-based auction site and earn the confidence of your potential buyers by offering to deal through the payment escrow feature offered on such sites. As the saying goes, “Let the Buyer Beware!” The legitimate seller should heed this warning also, and sell by a safe means… you do not want to get a bad check or a stolen credit card number in return for your valuable model!

[Date/Time=02-17-2003 – 7:18 AM]

Name:Barney C. Black, [Msgid=379512]
plese hepl with hydro


      • hi, friends, im looking for help to find cad or paper panes of hydro named Miss Budweiser, i need for made an 1/8 rc model, can anyone help me??? i heve been looking for more than 1 month but nothing, please send me mail at

      • we have an modelmakers building, prototipes, enginner, etc if any one need our services, contact or visit my web page

      • best regards
      • fernando palacio

[Date/Time=02-25-2003 – 5:48 AM]

Name:fernando palacio edreira, [Msgid=384434]
Re; Buyer (and Seller) Beware

      • thanks , you are rigth, i surf the web and find many photos of this hydro, and several details, now im draving cad plans to my model,wil be post here the result when finish, a lot of work, but really enjoy them, regards from spain.
      • fernando palacio

[Date/Time=02-26-2003 – 4:56 PM]

Name:fernando palacio edreira, [Msgid=385462]

      • I have not heard of anyone offering plans, but I can see why you want to build your own. The commercially manufactured R/C model of


      • is quite expensive. One just sold on eBay (item # 3116608353) for USD276.00. Here is the description taken from the eBay listing:
      • “Miss Budweiser style hydrofoil remote control boat, 42 inches long, 14 inches wide with K&B 7.5cc outboard and all accessories. Radio is a Futuba Magnum Sport FP-T2PB with a 75.690 chip set, receiver is a Futuba FP-R112JE 2 channel with a futuba FP-S148 indirect drive servo and a system 2000 1/4 scale TS-72 servo. Also included is the starter and spare leg housing and prop . Great summer hobby , I haven’t run this machine but was told it will do over 50 MPH on smooth water!!”

[Date/Time=02-26-2003 – 8:02 PM]

Name:Barney C. Black, [Msgid=385555]
PT 50 Found


      • I thought I’d write just to let you know that after 22 years of searching ( and 3 years since posting my original email on IHS) I have finally managed to find a Super Comet PT50 model. I was approached by email in response to my posting here, and I took a risk – after 22 years I thought it was worth it, and the model arrived today. It was found in a model shop in Italy, and it looks as though all of the parts are there including the assembly instructions and decals. I’ll post some pictures when completed – hopefully in a month or so. Thanks for your help in finding the model.

[Date/Time=02-26-2003 – 8:19 PM]

Name:Nick James, [Msgid=385567]
Re; plese hepl with hydro

      • Dear Fernando,
      • The IHS is the International Hydrofoil Society. Miss Budwieser is a hydroplane. Hydroplanes are a form of racing boats sponsored by the American Power Boat Association. I would suggest you look at their web pages. I suspect obtaining drawings would be difficult since these racing teams do not want to disclose any of their secrets to maintain an edge on their competitors.
      • S. Arima, IHS member

[Date/Time=03-01-2003 – 10:07 PM]

Name:S. Arima, [Msgid=387384]
Re; About PT-50 model

      • Dear Mr.Anthony CHOI,
      • Are you still serious of buying PT50 model hydrofoil which was manufactured by Gunze Sangyo? I have one untouched still in box.
      • Yours Sincerely,
      • Peter CHEUNG
      • 4th March,2003

[Date/Time=03-04-2003 – 9:47 AM]

Name:Peter CHEUNG, [Msgid=388816]
Re; Re; About PT-50 model


      • yes I still interest it.
      • my

[Date/Time=03-04-2003 – 11:41 AM]

Name:Anthony Choi, [Msgid=388901]
Re; PT 50 Found

      • again

[Date/Time=03-04-2003 – 11:24 PM]

Name:Peter CHEUNG, [Msgid=389427]
Attached File  “” – size 884204   Click Here To Download
Re; Re; Re; About PT-50 model


      • Dear Mr. Anthony CHOI,
      • Please see photos of model PT50 in Box.
      • Peter CHEUNG.

[Date/Time=03-05-2003 – 10:17 AM]

Name:Peter CHEUNG, [Msgid=389631]
Attached File  “” – size 18532   Click Here To Download
Re; Re; Re; About PT-50 model

      • Photo again with box opened and boat seen inside.

[Date/Time=03-05-2003 – 11:07 AM]

Name:Peter CHEUNG, [Msgid=389661]
Attached File  “” – size 16208   Click Here To Download
Re; Re; Re; Re; About PT-50 model

      • I can’t view this video.

[Date/Time=03-05-2003 – 11:58 AM]

Name:Anthony Choi, [Msgid=389691]

      • I live in Messina, Italy. I have built a PT 50 model in wood, to 1/20 scale. It’s propulsion is electric, but it can be equipped with two diesel motors. The hydrofoil model is an exact reproduction of the famous


      • . For more information, contact me!

[Date/Time=03-07-2003 – 7:05 PM]

Name:Vincenzo Annuario, [Msgid=391268]
RC Model Hydrofoil Plans Found


      • I looked on various websites for a good/damaged Shockwave R/C model that I could reverse engineer and scale up in size, but I was unable to find anything at all. However, when searching the web for a starter/plan I did find through Traplet Publications a plan for a hydrofoil. It is the “Rapier” by Graham Taylor previously featured in “Marine Modelling Magazine” (also Traplet) The plan number is MAR2392, and it is also possible to acquire the copy of Marine Modelling Magazine through this company (issue no. 69 December ’92) that gives a build overview and other usefull building infomation. The plan and magazine combined cost about ?10. I’ve had mine on the go for about a two weeks now (I’m a patient builder!) and it’s coming along nicely.

[Date/Time=04-08-2003 – 8:34 PM]

Name:Mike Keen, [Msgid=412916]
Re; RC Model Hydrofoil Plans Found

      • Hi Mike, information about this magazine issue and several others devoted to hydrofoil models is posted in our correspondence archives at

      • . The website for Traplet publications is:

      • . Graham Taylor’s most interesting website is at

      • . You should not hesitate to contact him through his website if you have questions. Of course we would like to have photos and lessons learned for our newsletter when your model is perfected.

[Date/Time=04-08-2003 – 8:41 PM]

Name:Barney C Black, [Msgid=412926]
Condor I Model Kit


      • Thought I’d just send you a picture of the completed Condor 1. The kit has been great fun to put together and was very well engineered despite the age of it. Trials have been extremely successful with the boat going straight up on its foils and even turning without coming off – a problem which I believe these models suffered from. I think the modern equipment I’ve used has helped – the motor is more efficient as is the electronic speed controller – and the weight has been reduced as well.

[Date/Time=06-02-2003 – 8:27 PM]

Name:Nick James, [Msgid=446033]
Re; Condor I Model Kit

      • Thanks Nick. We were not using the automated BBS yet when you first contacted IHS about wanting a model kit. Therefore I will reproduce below some of your previous correspondence as background:
      • “[26 Feb 03] I thought I’d write just to let you know that after 22 years of searching ( and 3 years since posting my original email on IHS) I have finally managed to find a Super Comet PT50 model. I was approached by email in response to my posting here, and I took a risk – after 22 years I thought it was worth it, and the model arrived today. It was found in a model shop in Italy, and it looks as though all of the parts are there including the assembly instructions and decals. I’ll post some pictures when completed – hopefully in a month or so. Thanks for your help in finding the model.”
      • Note that for those interested in hydrofoil models, there is a wealth of interesting correspondence in the pre-BBS archive on our page at
[Date/Time=06-02-2003 – 8:32 PM]

Name:Barney C Black, [Msgid=446038]
Russian Model Wanted

      • We are in the high speed ferry business and have developed catamarans using fixed hydro supportive foils. I am looking for a completed model of a early hydrofoil, preferably Russian. Can you guide me as to where I may find this?
      • Hydrocruiser Ventures, Box 438, Roadtown, Tortola, British Virgin Islands.
[Date/Time=06-02-2003 – 8:45 PM]

Name:Raymond Kalley, [Msgid=446043]
PT 50 Advice Needed

      • I have one of these kits that I am looking at putting together. Do you have any more details about what you used and why? Could you send some pictures of the inside and outside of the boat?

[Date/Time=06-13-2003 – 5:44 AM]

Name:Kelly Cunningham, [Msgid=451950]
Tucumcari Model fror sale

      • There is an unbuilt Tucumcari model from Aurora, on Ebay at the moment.

      • Malin

[Date/Time=06-17-2003 – 12:26 PM]

Name:Malin Dixon, [Msgid=454231]
PT50 model wanted

      • I am after a Model of a PT50. Can anyone help? I require one for static viewing or a working model if anyone has one. I know they are hard to get but who knows what is out there.

[Date/Time=06-29-2003 – 6:40 AM]

Name:Adrian Moitie, [Msgid=461561]
model of phm 5


      • trying to fine a model of phm-5 can any one help.

[Date/Time=06-30-2003 – 5:28 PM]

Name:roger barker from old phm-5, [Msgid=462322]
Re; model of phm 5

      • Check out this site,it’s not the PHM-5 but the Phm-4.

      • The USS-Aquilla(Radio Controlled model).
      • The model is build in a scale of 1:30,this makes her length 135 cm, beam 48 cm, and the weight is 14 kg.
      • The model is build according to the original drawings of the Boeing company.
      • In that time there where no propulsion jets fore such big models.

[Date/Time=07-02-2003 – 2:39 PM]

Name:Capt M van Rijzen, [Msgid=463453]
Re; model of phm 5

      • White Ensign Models offers a 1/350 model PEGASUS kit. The kit consists of of a cast resin hull, with white metal and photoetched parts. The kit includes comprehensive assembly and painting instructions. You could build that, change the number, and tweak the details main deck and above. The website is at

      • . The postal address is: White Ensign Models, Gardeners Cottage, Cowarne Court, Lower Eggleton, Ledbury, Herefordshire, HR8 2UF, U.K. The cost of the model is in British Pounds equivalent to about $35.50 USD, including air shipment worldwide.

[Date/Time=07-03-2003 – 5:31 AM]

Name:Barney C Black, [Msgid=463803]
Helo Blades as RC Model Foils


      • I intend to build an R/C model hydrofoil from scratch. Reading your website increases my interest in building my model. The “only” problem is the foils. Does anyone know how to use blades from an RC model helicopter as foils on a hydrofoil boat model? The effect of the slow running water must be similar to the air at a helicopter.
      • What do you think?

[Date/Time=07-28-2003 – 6:55 PM]

Name:Tom Delling, [Msgid=477683]
Re; Helo Blades as RC Model Foils

      • Hello Tom,
      • Your idea to use the blades from RC model helicopters for a hydrofoil model project makes good sense. This lask weekend I had a look at some model helicopters and also thought the blades could be suitable for RC hydrofoil models. Some of the higher performance model helicopter blades are now built up using a foam core and thin carbon fibre skins. These would be tough enough to cope with the occasional impact if used on a hydrofoil model. Some of the potential drawbacks of using helicopter model blades may be:
      • 1. They seem to have a chord length of 50mm or more, even for the smaller helicopter models. You would therefore need to consider building a fairly large scale hydrofoil model for these blades to be in reasonable proportion to the rest of the model.
      • 2. They have a quite large thickness to chord ratio, perhaps 10% or greater. This is more than typical required for the profile for a model hydrofoil. Although this should not be of much concern, there is likely to be a drag penalty in comparison to thinner section foils.
      • 3. They typically appear to have symmetrical profiles (same shape for top and bottom of blade). You would get a somewhat better lift to drag ratio using a cambered foil shape.
      • 4. Some of the less expensive blades still use balsa wood cores. Such blades would probably swell up and distort if immersed in water for a longer time.
      • An alternative that I am aware has been used successfully by some hydrofoil modellers is to purchase an aluminium ‘crescent’ extrusion. These are usually used for applications such as joint strips between carpet and lino flooring in houses. You may be able to obtain short lengths of such sections from a hardware shop or metal retailer. They come in widths (chord lengths) between about 30mm and 45mm.
      • If you go ahead and make use of model helicopter blades for your hydrofoil model, please report back on how they perform. Using them would certainly reduce the time and effort needed to build a hydrofoil model.

[Date/Time=07-29-2003 – 10:11 AM]

Name:Martin Grimm, [Msgid=478064]
Re; Helo Blades as RC Model Foils

      • Here are some rough ideas on how to calculate the lift of model helicopter blades when used as hydrofoils.
      • First you must have some idea as to the coefficient of lift for a blade of the cross section you have chosen.
      • Let?s assume the blade?s profile is asymmetrical and its thickness is 12% of the cord. An example of this type of wing would be a NACA 4412. From theory of Wing Sections, by Abbott and Doenhoff, you will see that the change in the coefficient of lift (Cl) will be linear from minus 10 degrees angle of attack (AOA) to 12 degrees AOA. At ?10 degrees the Cl is -.67. At 12 degrees the Cl is 1.55. Draw a graph with a line between these two points and you will know what Cl you have for any useable AOA. For example, 2 degrees AOA will generate a Cl of .6
      • To find the lift for any assumed AOA use the simplified lift formula L = F U^2 S Cl.
      • Where L is lift.
      • F is a factor and that factor is 2.09.
      • U is the velocity in MPH.
      • S is the area of the foil in feet^2.
      • Cl is the coefficient of lift from your graph.
      • So if you choose a foil of one tenth of a square foot flying at 10 MPH and the coefficient of lift is .6 (that is to say you have an angle of attack of 2 degrees) you will have lift of 2.09 x 10 x 10 x .1x .6 = 12.54 pounds.
      • You know that the lift required is equal to the weight of your model. Now that you have the formula you can change the various assumptions to arrive at the lift required.
      • Good luck.
      • Ray Vellinga

[Date/Time=07-30-2003 – 1:50 AM]

Name:Ray Vellinga, [Msgid=478612]
Grumman Concept Display Model


      • I saw this interesting display model for sale on eBay. The description reads as follows: “Offered here is a rare and unusual manufacturer’s model made by the Grumman Corporation. No date appears anywhere on the model, but appears to be from the 1960s. The model is a scale prototype of a “Hydrofoil Research Craft”. I do not believe that such a craft ever really was built, but it was to be 104 ft. long with a beam of 23 ft. She was to weigh 90 tons with a top speed of 60 knots. This desk-top model is approximately 14″ long. The base is made from solid walnut and measures about 5″ X 16″. The model is heavy, and appears to be constructed from cast metal and solid cast resin. The side foils hinge up, and the motor assembly in the stern also hinges up.”
      • The auction ends August 10, 2003. Here is a link to the page on eBay:

[Date/Time=08-04-2003 – 6:00 PM]

Name:Barney C Black, [Msgid=481632]
Re; Grumman Concept Display Model

      • It appears to be a model of the hydrofoil “Denison” built by Grumman. I have a photo of her foilborn and was onboard her in the late sixties early seventies when she was in a cradle at San Diego.

[Date/Time=08-05-2003 – 1:58 PM]

Name:Dale Beresford, [Msgid=482171]
Re; Grumman Concept Display Model

      • I am attaching a photo of the hydrofoil “Denison” which I think is the ship the model represents.

[Date/Time=08-05-2003 – 2:03 PM]

Name:Dale Beresford, [Msgid=482175]
pt 50 model


      • i would like to rebuild a pt 50 hydrofoil model i would like to know if you know someone who has one for sale or information on how to rebuild one

[Date/Time=10-21-2003 – 11:27 AM]

Name:scott llewellyn, [Msgid=529061]
pt50 model wanted


      • i have been wanting a pt 50 hydrofoilo for about 1 year now and i was wondering if you know where i could buy one or rebuild one

[Date/Time=10-21-2003 – 11:45 AM]

Name:scott llewellyn, [Msgid=529070]
pt 50 model wanted

      • i have been looking for a pt 50 rc hydrofoil model i was wondering whever you know any places or people who could help with my search. i also want to rebuild one so do you know where they might be selling them or you have some prints that could help[ me rebuild one

[Date/Time=10-21-2003 – 12:12 PM]

Name:scott llewellyn, [Msgid=529086]
Re; pt 50 model

      • Try for a PT-50 RC model,look for hydrofoil.
      • My colleague found one on (germany)look for Tragfl?chenboot.
      • But most germans ship only in germany.
      • If you want to build one try to get good plans,
      • and photo’s.
      • Good luck!!!

[Date/Time=10-22-2003 – 5:42 AM]

Name:Capt M van Rijzen, [Msgid=529748]
Re; pt 50 model

      • This will not be easy to find. Take a look at the IHS pages at

      • and

      • for names and email addresses of people active in hydrofoil modeling. According to one correspondent Nick James, he searched for 22 years before finding a Super Comet PT-50 model (


      • ) in Italy. He took a chance and bought it. There is a photo of the completed R/C model on the IHS site.

[Date/Time=10-25-2003 – 7:55 PM]

Name:Barney C Black, [Msgid=532304]
PHM; Patrol Hydrofoil Missileship


      • For sale:PHM: Patrol Hydrofoil Missileship!!!
      • Check:

      • This is a Radio Controlled model of the USS Aquilla, one of the PHM class hydrofoils used by the US navy.
      • The model is build in a scale of 1:30, this makes her length 135 cm, beam 48 cm, and the weight is 12 kg.
      • The model is build according to the original drawings of the Boeing company.
      • The aft foil can be controlled by a servo and gyro.
      • If you take away the deckgun, you can see the bowtruster and the mechanism to steer the bow foil.
      • the deckgun and radar rotate the Bow foil is used for steering it has a bowthruster (Bugschraube) for maneuvering
      • Deck, deckhouse and foils are made of aluminium.
      • Included:
      • – Model
      • – mould, to make a new PHM hull
      • – photobook, with many original photo’s
      • – many original drawings of the complete ship from boeing
      • – 18 cell NiCd 4 Amp!!! (25,2V)
      • – 4 cell NiCd 4,8 V for receiver
      • – 4 cell NiCd 4,8 V for bowthruster
      • – receiver

[Date/Time=11-20-2003 – 5:48 AM]

Name:Capt M van Rijzen, [Msgid=547275]
32nd Parallel Schnellboot Hull Source


      • What I have for you is information about the WWII Schnellboot. 32nd Parallel is out of business. However, there are two companies currently manufacturing fiberglass hulls for this boat and selling the hulls with some drawings (not a kit). This assumes some scratch building. They are: from England: (1/30th scale) Kingston Mouldings: email:

      • website:
      • The other one is an American company: (1/32nd scale) Microglass (you’ll find it if you use a search engine.) I am building the one from Kingston Mouldings.

[Date/Time=11-27-2003 – 10:50 AM]

Name:Steve Ebel, [Msgid=550950]

      • Hello
      • Here is another company that sells a VS8 in 25th scale.

      • . It is located in Germany.
      • about $1200 for a full kit without ship.
      • Antoine

[Date/Time=12-05-2003 – 5:53 PM]

Name:Antoine Lenormand, [Msgid=554852]
 Image Attached:  “schell06.jpg”   Click Here To View
Re; PHM; Patrol Hydrofoil Missileship

      • possible to ship to the U.S.? possible to trade for unbilt kits of 32nd schnellboot and Hegi police boat hydrofoil , and cash? please reply thanks .

[Date/Time=12-22-2003 – 4:17 PM]

Name:Stephen Mc Donald, [Msgid=562352]
Re; PHM; Patrol Hydrofoil Missileship

      • sorry ! just realized that you already sold the missileship. if you should come up with another please e-mail thanks. steve

[Date/Time=12-22-2003 – 4:32 PM]

Name:Stephen Mc Donald, [Msgid=562357]

      • Hi Steve
      • I am the happy owner of that beauty. The builder (Ronald) did a marvellous job. I would be happy to share some pics with people interested. I am modifying it with the original foils and waterjet propulsion. It will have an automatic control in roll and pitch to help during foilborne runs.
      • Antoine

[Date/Time=12-24-2003 – 1:29 AM]

Name:Antoine Lenormand, [Msgid=562900]
 Image Attached:  “PHM4_2.JPG”   Click Here To View
Re; re; PHM model pics

      • can’t open the jpeg

[Date/Time=01-01-2004 – 11:11 PM]

Name:Dan Schmidt, [Msgid=565629]
cRe; Re; re; PHM model pics

      • If you want I can send some pics by email.
      • Antoine

[Date/Time=01-03-2004 – 11:08 AM]

Name:Antoine Lenormand, [Msgid=566157]
Re; pt 50 model

      • HI,
      • I have just seen on in ebay.
      • Peter from Hong Kong

[Date/Time=01-15-2004 – 12:04 AM]

Name:Peter CHEUNG, [Msgid=571745]
Re; pt50 model wanted

      • Hello there,
      • I have just seen a PT50 hydrofoil model in ebay and its item number is 3169557927.
      • Hoping that this information would be helpfulto you and good day.
      • Peter from Hong Kong

[Date/Time=01-15-2004 – 6:28 AM]

Name:Peter CHEUNG, [Msgid=571824]
Re; Re; pt 50 model

      • Hello Peter , I am a member of the hydrofoil society and I was wondering , after seeing your message , where can I see and bid on this PT 50. On which E-Bay is it on? Thanks Stephen Mc Donald

[Date/Time=01-15-2004 – 3:32 PM]

Name:Stephen Mc Donald, [Msgid=572094]
Re; Re; pt 50 model

      • Hello again Peter , I just found the item your were talking about on E-Bay , thank you very much for bringing this to our attention. If you should ever need anything from this side of the world please just E-Mail . Thanks again Steve

[Date/Time=01-15-2004 – 4:00 PM]

Name:Stephen Mc Donald, [Msgid=572107]
Re; Re; pt50 model wanted

      • Just to let everyone know that the PT50 Model went for over $900.00 on e-bay!!! Wow
      • Rod Clayards IHS Member

[Date/Time=02-01-2004 – 5:52 PM]

Name:Rod Clayards, [Msgid=582129]
RC PHM-1 Pegasus


      • I am in the process of undertaking the construction of a 6′ Radio Controlled PHM-1 Pegasus. My father was a Chief (ETC Nosek was his rate I believe) on the first crew, and I stood on the pier as a 9 year old kid on her first arrival to Key West. (Man, how the Coast Guard scratched their heads when she broke the horizon!) I would like to know if anyone has a copy of schematics, or technical drawings for her or the others. Due to the fact that she’s gone and I’ll never see her fly again, I want to build one that will. Also, since some of the correspondance on your pages are dated, what ever came of the others that were due to be scrapped. Are there anymore out there. Feel free to contact me at

      • . Thanks, TDM

[Date/Time=03-04-2004 – 3:54 PM]

Name:T.D. Mehl, [Msgid=607827]
6` Radio Controlled PHM-1 Pegasus


      • I am in the process of undertaking the construction of a 6′ Radio Controlled PHM-1 Pegasus.? My father was a Chief (ETC was his rate I believe) on the first crew, and I stood on the pier as a 9 year old kid on her first arrival to Key West.? (Man, how the Coast Guard scratched their heads when she broke the horizon!)? I would like to know if anyone has a copy of schematics, or technical drawings for her or the others.? Due to the fact that she’s gone and I’ll never see her fly again, I want to build one that will.? Also, since some? of the correspondance on your pages are dated, what ever came of the others that were due to be scrapped.? Are there anymore out there.? Feel free to contact me at

      • .? Thanks, TDM

[Date/Time=03-04-2004 – 7:59 PM]

Name:TDM, [Msgid=607933]
6` Radio Controlled PHM-1 Pegasus

      • Several documents with PHM technical information are included on the IHS AMV CD-ROMs including the original Builders Spec. I see that Floating Drydock is offering a set of PHM Hull faired lines and stations at 1/48 scale for $12. See their web page at

      • . White Ensign Models offers a PHM kit. See their website at

      • . They sell their kit direct from the website, and they also have dealers that sell their products. See the following website for photos of a completed kit and hints for building:

      • . Hope this is helpful. Please send photos and description of your model in process and finished for the IHS newsletter. Send to
[Date/Time=03-12-2004 – 7:36 PM]

Name:Barney C Black, [Msgid=612693]
Re; RC PHM-1 Pegasus

      • See the IHS correspondence archive page at

      • for PHM contacts. One PHM is floating in Missouri. Last I heard, all or most of the others were in Wilmington, NC and were slowly being scrapped by their owner, an individual.

[Date/Time=03-12-2004 – 7:41 PM]

Name:Barney C Black, [Msgid=612697]
6` Radio Controlled PHM-1 Pegasus

      • I just recalled that there is a guy who periodically sells copies of a drawing “OUTBOARD, OVERHEAD PROFILE & BODY PLAN” on eBay, if this would be of any help. His description is as follows:”Size of drawing is 23″W x 102″L. Scan on EBAY photo is terrible; drawing is very crispy, sharp. Buyer pays with US or Canadian Postal Money Order (US funds please!); shipping & handling is $ 10.50 within a rolled tube to 48 US states; Hawaii, Alaska or Canadian destination are $ 16.50 S/H. Overseas shipping on a case by case basis.” He has a copy up for auction now, item no. 2232579032 and the auction ends Mar 22. But if you miss this one, he will auction another copy soon. His eBay nickname is drydockjoe. You can contact him directly with questions by becoming an eBay member (free) and using the search feature to find him.

[Date/Time=03-16-2004 – 5:06 AM]

Name:Barney C Black, [Msgid=614939]
PHM-1 Pegasus

      • Gentlemen,
      • Progress has come along nicely on the 6’6″ PHM-1 Pegasus. I know have a 24″ wide 6’9″ block of foam in order to to start shaping the Pegasus hull. I have secured the required HydroJet engines to push the boat once she is 14.4″ out of the water. I will build her out of carbon fiber. If the real Pegasus would do 60-70mph, I won’t rest until mine will do at least that! I have the radar guns ready. I will supply pictures once they are ready of the boat as she progresses. If I get a RC hydrofoil to do 70mph she will make the cover of magazines, everybody get ready for the stir! Anyone here remember my Dad? ETCS Lawrence Nosek, he was a 1st Class in Bremerton, then picked up Cheif, and Snr Chf before we left Key West in approx.’83. Thanks, and all of your suggestions, and pointers have been most helpful. Thanks, Troy Mehl

[Date/Time=03-17-2004 – 12:36 AM]

Name:T.D. Mehl, [Msgid=615563]
PT-50 For sell

      • I have a PT-50 Super Comet kit for sell on ebay. The kit is new, in the box.
[Date/Time=04-08-2004 – 7:44 PM]

Name:Kelly, [Msgid=628494]
 Image Attached:  “IMG_00072.jpg”   Click Here To View
Plans for Kometa Model Needed


      • On your website I found model of Russian Meteor produced somewhere in Italy. Can you provide me more details – contacts – or do you know who hs a plans for such hydrofoil?

[Date/Time=05-31-2004 – 8:16 AM]

Name:Peter Caha, [Msgid=656324]
Re; Plans for Kometa Model Needed

      • I believe you refer to the large model produced by Siderea in Rome. It was sold by Mantua Model, Italy. Photos and information about this model are provided by IHS correspondent Ho Sing in the IHS archives at

      • (scroll down to find photos and messages). You may want to contact Ho Sing and some of the correspondents who answered his posting. There is a scan of the model kit directions at

      • .

[Date/Time=05-31-2004 – 8:27 AM]

Name:Barney C Black, [Msgid=656326]
Re; Plans for Kometa Model Needed

      • Well, what do you want to know?? I own one,and have two drawing in 1:2 scale.

      • I hope I can help you.

[Date/Time=06-02-2004 – 8:00 PM]

Name:Mark van Rijzen, [Msgid=657936]
Introduction of my R/CHydrofoilsModels wo


      • Hello. Mr.International Hydrofoil Society WEV master — I am Yoichi Takahashi is living in Kyoto by the radio control ship modeler of Japan On WEB,HP of an international hydrovane was discovered in the meantime, and itvisited it several times. I think that it is glad from very interesting contents. From several year before, although I was tackling radio control modeling of a hydrofoil, I succeeded in radio control-ization of the hydrofoil of 2 boats lately. Then, I contribute to your HP and think that I would like the modeler in the world to know. Since image data sends, please give me introduction by all means by HP. One is 1/40 of the scale models of the Boeing jetfoil. Sailing of all rejection type hydrofoils was realized by carrying out attitude control using the small gyroscope for model radio control helicopters. Although the promotion method was a propeller system, hydrovane control theory developed originally. The 2nd is the hydrovane patrol guided missile of the Maritime Self Defense Force of Japan. This ship realized surfacing sailing using the hydrovane by the same water jet promotion as thing. The water jet pump is using the miniature turbine pump of a full its original work. The hydrovane control theory of original development andthe gyroscope for model radio control helicopters are used also for this,and it stabilizes and runs by surface control. All run power by the electric motor of a nickel-Cd battery drive of 7.2V. Since the snap oftwo pictures and me is sent, please give me printing in the section ofthe radio control hydrofoil your homepage. In addition, you may alsocarry my E mail address. Thank you for your consideration. About my R/C hydrofoil, if there is a question, please inform the following and E mail address. Above yoichi takahashi

[Date/Time=06-12-2004 – 1:28 AM]

Name:yoichi takahashi, [Msgid=663149]
 Image Attached:  “scan0001.jpg”   Click Here To View
Introduction 2 my R/CHydrofoilsModels

      • The 2nd work of my R/C model hydrofoil is introduced. The 2nd is the hydrovane patrol guided missile of the
      • Maritime Self Defense Force of Japan. This ship realized surfacing
      • sailing using the hydrovane by the same water jet promotion as thing.
      • The water jet pump is using the miniature turbine pump of a full its
      • original work. The hydrovane control theory of original development and
      • the gyroscope for model radio control helicopters are used also for this,
      • and it stabilizes and runs by surface control.

[Date/Time=06-12-2004 – 1:54 AM]

Name:yoichi takahashi, [Msgid=663155]
 Image Attached:  “missilefoil.jpg”   Click Here To View
Introduction 1 my R/CHydrofoilsModels

      • One is 1/40 of
      • the scale models of the Boeing jetfoil. Sailing of all rejection type
      • hydrofoils was realized by carrying out attitude control using the small gyroscope for model radio control helicopters. Although the promotion method was a propeller system, hydrovane control theory developed originally.

[Date/Time=06-12-2004 – 2:00 AM]

Name:yoichi takahashi, [Msgid=663156]
 Image Attached:  “jetfoil.jpg”   Click Here To View
Introduction 3 my R/CHydrofoilsModels

      • My snap and I developed over the time for three years. Boeing jetfoil Recently image of 1 / 40 scale R/C model

[Date/Time=06-12-2004 – 2:08 AM]

Name:yoichi takahashi, [Msgid=663157]
 Image Attached:  “DSCF0011.JPG”   Click Here To View
6` Radio Controlled PHM-1 Pegasus

      • Well here are images of a PHM model on motor pods.

      • RCgroups is a nice BBS format if anyone wants to try to incorporate it into this site. I find this style of bbs, the phpBB Group, and Invision Power Boards very easy on the eyes.
      • Also, I recommend the plans from floating drydock. My “engineer” has finished his 1-1 airplane build and has begun to focus on the model PHM project. We are not headed toward anything as large as six feet though.
      • Here is an image of his engine and jet pump in the cardboard model of the stern that I produced for him.

[Date/Time=06-14-2004 – 1:02 PM]

Name:Aimee Eng, [Msgid=664081]
 Image Attached:  “Pump01.JPG”   Click Here To View
Introduction of my R/CHydrofoilsModels wo

      • Hello Yoichi Takahashi, thank you very much for sharing these exciting photos and inventive designs. I hope that the editor of the IHS newsletter will publish these photos in the next edition and that the photo gallery editor will display them on the website. You have done some excellent work!

[Date/Time=06-14-2004 – 8:37 PM]

Name:Barney C Black, [Msgid=664286]
6` Radio Controlled PHM-1 Pegasus

      • Hi Aimee, thanks for that URL with the excellent series of photos on the model PHM. Also, it is great to hear that you are starting on your PHM model after all these years of contemplation! For some reason I was not able to view the photo you attached to your posting, though… I am not sure why… maybe damaged in uploading.

[Date/Time=06-14-2004 – 8:44 PM]

Name:Barney C Black, [Msgid=664288]
6` Radio Controlled PHM-1 Pegasus

      • I have noticed that same problem with other uploaded images on this board. I will upload it again, if it doesn’t work, I will post it at the R/C groups site.

[Date/Time=06-15-2004 – 12:46 PM]

Name:Aimee Eng, [Msgid=664561]
 Image Attached:  “Pump01.JPG”   Click Here To View
What model wetbike do I have


      • I have a Spirit Marine Suzuki made moter and it says wetbike on the handlebars. It was given to my Dad years ago, then he have it to me last week. I do have a serial #. How do I find out what year model I have. Thanks for your help.

[Date/Time=06-22-2004 – 11:45 AM]

Name:Darlene Chancery, [Msgid=667971]
Re; What model wetbike do I have

      • Look at the WetBike’s serial number located on the rear of the craft(not the state’s registration number). US Standardized serial numbers use the first 3 letters (WJW for Wetco) to denote the boat manufacturer. The last 2 digits are the model year. Many WetBikes are late 70’s and early 80’s.
      • The engine is a product of Suzuki of Japan, so US parts may not fit. Suzuki gave me Ultranautics (800 356-0777) for replacement parts.
      • The WetBike was a lot of fun to ride and drew a lot of looks. It handled more like a motorcycle than jet ski. However, the WetBike is not a hydrofoil. The foils ride on the surface of the water like a wakeboard. I have an ’85 model stored in my shop.

[Date/Time=06-23-2004 – 3:03 PM]

Name:Barry Steele, [Msgid=668696]
Introduction 2 my R/CHydrofoilsModels

      • Utsukushi desu!!
      • ?????m san
      • If Possible could you provide pictures of the water intakes, engine, pump and controls inside your Spaverio model.
      • Aimee Eng

[Date/Time=07-01-2004 – 1:29 PM]

Name:Aimee Eng, [Msgid=673211]
Nikko R/C Hydrofoil for sale

      • Hello,
      • I have a Nikko Radio Controlled Hydrofoil currently on auction at ebay. Please have a look. There is No Reserve on the auction! This is a discontinued item!
[Date/Time=07-06-2004 – 8:49 PM]

Name:Kenji Watabe, [Msgid=675438]
Introduction 2 my R/CHydrofoilsModels

      • Hello. Mr,Aimee Eng.
      • Responding to your request, the picture of the water intake of my hydrovane patrol guided missile?@ship and an inboard mechanism is sent here. A water intake is the same structure as real ship. The electric motor which drives the waterway and water jet pump to a pump is carried in the inside.
      • Above

[Date/Time=07-10-2004 – 8:59 PM]

Name:yoichi takahashi, [Msgid=677558]
 Image Attached:  “WateIntakes.jpg”   Click Here To View
Introduction 2 my R/CHydrofoilsModels

      • Arigato Gozaimasu. Shashin ii desu.
      • (demo watashi onna desu.)
      • Thank you for posting the new images. However, they bring up more questions.
      • Does the entire waterway inside the boat fill up with water, and remain full as the boat runs?
      • Does it siphon feed fresh water or does it rely on forward speed to supply the intake.
      • You mention the motor supplying the waterway and jetpump are there two impellers? One to draw water into the waterway and one to push the boat forward?
      • Shitsureishimasu
      • Aimee Eng

[Date/Time=07-11-2004 – 9:08 PM]

Name:Aimee Eng, [Msgid=677894]
Introduction 2 my R/CHydrofoilsModels

      • Hi! Aimee Eng san conbanwa!
      • I reply to your question.
      • If a hydrofoil is soaked in the water surface, water permeates from a water intake and the injection mouth of a jet pump. The water will
      • small air slightly into a water duct, and will fill most. If rotation of a turbine pump increases in order to start a ship, with jet injection of water, the air in a water duct will serve as a bubble, and will be discharged. Therefore, it is filled with water at the time of a foil born, and the inside of a duct can supply water to a turbojet pump continuously. It inhales with the amount of injections of a turbojet pump, and quantity and hull speed need to carry out the design which maintained balance in relation to mutual for efficient and continuous operation of a turbojet pump. Since the illustration in order to help an understanding is appended, please refer to. Then,
      • PS: It is very good at Japanese in your Roman alphabet. Can Japanese be spoken?
      • Above

[Date/Time=07-17-2004 – 10:09 AM]

Name:yoichi takahashi, [Msgid=681043]
 Image Attached:  “hidrofoil-1.jpg”   Click Here To View
Introduction 2 my R/CHydrofoilsModels

      • Mo arigato gozaimasu
      • I can speak a little Japanese, but my vocabulary is small.
      • Since my friend has again gone flying, the PHM project is halted on account of good weather.
      • I had intended to start a PT-50 project to fill the hydrofoil project time, as they are “v” foils and propeller driven. An easier project.
      • However you have inspired me to attempt another jet drive on my own. And make this an electric project.
      • Here are the frames I cut today.
      • Left PT-50
      • Right Sparviero Missle hydrofoil

[Date/Time=07-17-2004 – 2:50 PM]

Name:Aimee Eng, [Msgid=681182]
 Image Attached:  “P1010022copy.jpg”   Click Here To View
Introduction 2 my R/CHydrofoilsModels

      • Here is today’s progress on the Sparviero Missle foil hull.
      • It is sheeted and ready for fiberglass.

[Date/Time=07-18-2004 – 9:57 PM]

Name:Aimee Eng, [Msgid=681592]
 Image Attached:  “P1010027a.jpg”   Click Here To View
RHS 160 F- Foil Arrangement

      • I want to build a RHS 160F and so I am searching for detailed plans, also of the foil arrangement. I am searching for a side view, a top view and a front view. Perhaps anyone can help me.

[Date/Time=07-19-2004 – 5:17 PM]

Name:Felix Marsteller, [Msgid=681975]

PRIOR TO 2002:

International Hydrofoil Society Correspondence Archives…

Radio Controlled (R/C) Model Hydrofoils, Power & Sail
Discussion, Advice, Information Sharing, Lessons Learned, and Networking(Last Update 2 Jun 03)


Buyer (and Seller) Beware!

[17 Feb 03] Some of the commercially produced hydrofoil RC model kits have been long discontinued. Recently, several people who posted messages here were contacted directly by email with an offer to sell a rare such model at a price in the hundreds of dollars. The individual making this offer was not a member of IHS and is not known to us. The offer may be perfectly legitimate. The price may be perfectly fair… IHS has no way of knowing, and we do not recommend or endorse products and services. This seems a good opportunity to remind our valued members and correspondents to be wary of responding to any unsolicited offer to sell valuable merchandise by e-mail. If, due to distance or other reason, you have no way to meet the seller under safe circumstances and see the merchandise before you buy, then you would be ill advised to provide personal information, give out your credit card number, or mail a payment in the hundreds of dollars in such a situation. For the legitimate seller with a valuable model or other item to sell who does not have an established internet business, I would recommend that you sell the item locally where people can view the item before buying in a safe public location. Or you can list your item for sale on eBay or other web-based auction site and earn the confidence of your potential buyers by offering to deal through the payment escrow feature offered on such sites. As the saying goes, “Let the Buyer Beware!” The legitimate seller should heed this warning also, and sell by a safe means… you do not want to get a bad check or a stolen credit card number in return for your valuable model! — Barney C. Black (Please use the BBS to reply)

New Sailing Hydrofoil RC Model From MicroSAIL

[14 Apr 02] microSAIL! is about to introduce a new radio controlled model, the aeroSKIFF. The boat has a very fast canting keel (52 degrees/one second) for stability and a dagger board just forward of the keel strut for lateral resistance. This boat is significant because it is the first KEELBOAT, to the best of our knowledge, either full size or models to sail on hydrofoils–and only two foils at that! There is a main hydrofoil on the daggerboard and one on the rudder; altitude is controlled by a slightly modified version of Dr. Sam Bradfield’s wand system. We are patenting a version of the aeroSKIFF concept for use on large monohulls such as Open 60’s and feel that our system can revolutionize monohull sailing. This type of boat, a MONOFOILER(tm) will never be as fast as a multihull foiler but it can create a unique niche for itself as a very fast single hull sailboat. We would be interested if anyone has heard of or seen — and can document — another ballasted keelboat (full size or model) having sailed on foils. — Doug Lord (

Kometa R/C Model – Help Needed

[24 Mar 02] I inherited an antique fiberglass model of the Kometa Hydrofoil (It was sold by Mantua Model, Italy, made by a small company Siderea in Rome). The model is almost 5 feet long, and seems to be built for R/C, it also has scale features (white metal window frames, lifesavers, fittings) as it has comes with a sturdy gearbox to drive 2 contra rotating props (Engine size is supposed to be a .60 – .90 glow). It comes with all the foils (extruded aluminum and curved), and foil legs (cast metal). The kit has features to be totally scale (white metal window frames, lifesavers, radar, etc). One part of the planning is my primary concern about the total weight, and CG, other details include: size of rudder, rudder placement, cooling, etc. Alas, no instructions! The picture of the bare hull is attached. I was wondering if anyone had come across this, and what were their experiences building and running this kit? — Ho Sing, Singapore (



[29 Jun 02] May be these pictures will help you! Can you send the foil’s drawings? — Michael Moizhes (

Click Here for Larger Version

[29 Jun 02] Click Here for a scan of instructions for the Mantua Model Kometa-M kit. Click Here for a photo of the piece parts. — Martin Grimm (

[15 May 03] Just for your information a hydrofoil like your model is sailing between Dar Es Salaam and Zanzibar Tanzania transporting passengers-it was imported from Russia — Johannes Pedersen ( <></>

PT-50 Model Wanted

[15 Mar 02] I have been looking for the PT 50 model for a long time. I would like to know if you can tell me where I could get the PT50 kit? or maybe you know someone that would like to sell me one. — Felix (

Response…[15 Mar 02] The problem is that the model in not being made any more since 1984 (I guess). A while ago I saw one one on eBay being sold for US$295. The best way is to find drawings of the PT-50 ,and build it yourself. — Mark van Rijzen ( website:

[17 Feb 03] One note of caution: If you get an offer to sell you a model in response to this posting, be wary about giving out credit card numbers or sending off a lot of money in response to email offers from individuals who do not operate an established internet business and are not located where you can physically see the model in a public place. In such a circumstance you could suggest to the seller that he list the item on eBay, and then use the payment escrow service offered on the eBay site to be sure you get your merchandise before the funds are released. — Barney C. Black (Please use the BBS to reply)

Hydrofoil Model Experiments

[3 Feb 02, updated 4 Mar 02 ] I conducted some experiments in 1978 that I am now getting back into after a lapse of 24 years. I even have some fuzzy video (*.avi file – 400K) showing my early craft becoming foilborne and operating. The original film was taken as 8mm, and it was later copied to VHS. This version was only recently converted to digital format. So, the quality has suffered a bit in the translation. I am looking for the original film, and if I can find it, will see if it is possible to get a better, enhanced copy made of it. There were problems of course, but after reading many of the messages here over the past couple of years since discovering this forum, I think I can address many of them now. As my time permits, I will try to bring the information I have discovered before this group for their use and entertainment. Now, some details of what I did way back when. I used a Dumas Swamp Buggy as the basic platform for my craft. Its hull is 28″ in length and has a 10″ beam. It proved to be a nice, stable platform to work with. I built it with only a couple of modifications to the original design. Mostly for my convenience to be honest. The first modification was to turn the engine pylon 180 degrees so that the engine faced in a more standard prop forward position. This allowed for easier starting of the engine, and use of a standard propeller rather than a more difficult to find pusher prop. The second modification was to build the boat with two rudders rather than the single shown on the drawings. This allowed for more control at lower speeds, and I felt more control to help counteract the foils tracking tendencies. It proved to be a good choice. This kit is still available from Dumas and various hobby supply shops for a price in the range of $50.00 or so. My engine selection was to use a Veco .19 r/c engine as it had very high power available for its size (approximately 1 BHP). As for my choice in foil design, I chose to build a single surface-piercing front foil, and what I termed a “W” foil for the rear. This, I felt would give me the stability of a three-point stance once foilborne. There were many variables that I played with as I remember. Mostly dealing with the angle to set the engine at (I chose to keep the original 5 degrees suggested by Dumas), as well as the angle of incidence of the foils (both front and rear). I originally selected a 0 degree setting for both foils in relation to the hull itself. The rear foil was set as close a possible to the same incidence as the front foil to help cut down on the initial complications of their interaction with each other. The front foil did have a deeper draft than the rear, and was set 10″ aft of the bow. The rear foil was mounted directly below the stern, and was even with its aft bulkhead. Front foil was created from balsa aileron stock (1″ wide) and shaped into a “water foil” cross section. The front foil was built with a 45 degree angle built into the foils. The rear foil was a bit more complicated, and that will have to remain for a future post. The engine thrust setting had MUCH less effect on the overall performance of the foils than I had expected. In parting, this craft did have some great potential, did work in the foilborne mode, and was a rather inexpensive way of doing some good experiments in hydrofoils. I am currently working on preliminary tests of a new boat that I hope will eventually end up as a hydrofoil. Again, it is based on a Dumas Swamp Buggy (I can’t seem to get away from this hull). I am still using a Veco .19, but have drifted away from the air-screw driven design. I am using a Graupner Water Jet, and once I am satisfied that I will be able to force enough water through the system, I will begin working on the foils. So far, all looks good. More details and photos will follow as the experiments progress. I will be happy to answer any questions. — Joe Bennett (

VS-8 R/C Model Owner

[3 Feb 02] I have a VS-8 that I run on a regular basis. 32nd Parallel Corp is out of business, I had a hard time with them myself. — Leonard (


[23 Jan 02] I am trying to build a model of the DISCO VOLANTE. Unfortunately, I have yet to find a marine engineering firm that still carries them. Also, if you look at the Rodriguez Canterei navale website they also have some information on the FLYING FISH (i.e., before conversion). It appears the FLYING FISH underwent extensive conversion at Miami Shipbuilding Co. before her movie role, including possible alteration of the forward section up to and including the foils, so I’m not certain if the plans would be complete as to new underwater lines and the integration to the “cocoon.” Information is also extremely sparse as to possible plans of the same “cocoon.” — Doug Binish (email address withheld)

Response…[23 Jan 02] Your information about conversion of FLYING FISH into DISCO VOLANTE for the James Bond movie Thunderball is partially correct. Miami Shipbuilding Corp (MSC) took care of drydocking FLYING FISH, but Allied Marine, here in Miami, fabricated the false after-part of the hull that broke away when the surprise get away was made. Click Here to see a newspaper ad dated 18 Feb 1966 offering the vessel for sale. — Jean E. Buhler

[3 Feb 02] Information such as this is a valuable aid in tracking and finding reliable plans for the DISCO VOLANTE. I understand that the cocoon section ended up as a houseboat somewhere in West Miami. True facts? Also, Is the German firm offering the PT-20 plans reliable as far as delivery and pricing( I believe it is on the models page?) — D. Binish (email address withheld)

Modeler Needs DISCO VOLANTE Details

[13 Jan 02]  I have only two photos of the DISCO VOLANTE. The conclusion based on these photos is that it was built from a Supramar PT-20. Have you more information about this topic ? I am very interested in this because I plan to build a PT-20 model with the option to alter it into a DISCO VOLANTE. I have the drawings for the PT-20 but they are not very detailed, so I am trying complete them. — Michael Thies (

Responses…[26 Mar 02] There is a bit of information and three small black and white photos of the DISCO VOLANTE in the January 1966 issue of Popular Science. The article is titled “James Bond’s Weird World of Inventions. — Barney C. Black (Please use the BBS to reply)

[14 Sep 02] I`m wondering if your intention to build a PT-20 is still on…I have two 1:24 scale plans of her [1. plans of an R/C PT-20 Hydrofoil…German I think! 2. Original Supramar PT -20 plans] Let me know. I built a 1:24 scale static model of a PT-20…see below. — Alex (

CURL CURL Model Kit Wanted

[30 Dec 01] I am very interested in the CURL CURL boat that you have on the website. Would you be able to tell me where I could get a kit (or completed boat)? Also, how does it run? — Chris Kozlik (

Model VS-8 Schnellboote Wanted

[2 Sep 01] I’m finally at a point in my life where I can get back to enjoying modeling and model boating. Specifically, I need some info on 32nd Parallel’s Schnellboote model. I just finished reading the thread you have posted on the VS-8 Hydrofoil. What a great job that was, and the fun the owner is having with it now! Sadly, as you pointed out in the thread, it appears 32nd Parallel Corp. is in hiding. So if anyone out there has this boote (boat) in kit form or already built and wants to sell it, please drop me a line, so we can commence to dicker the price. — O.E. “Spotter” Dillon, Woodbridge, VA, USA (

Response…[2 Sep 01] It looks like Antoine Lenourmand, the author of the thread you mention, has just sold his model on eBay at, item # 1614864145. One note of caution: If you get an offer to sell you a model in response to this posting, be wary about giving out credit card numbers or sending off a lot of money in response to email offers from individuals who do not operate an established internet business and are not located where you can physically see the model in a public place. In such a circumstance you could suggest to the seller that he list the item on eBay, and then use the payment escrow service offered on the eBay site to be sure you get your merchandise before the funds are released. – Barney C. Black (Please use the BBS to reply)

PT 50 Model in Holland

[14 Jun 01] Just want to let you know that the PT-50 kit is really fast. Faster than my I think cause my engine stopped working (after 12! years ), it was still the original Mabuchi RS-540SD black motor. Condor Ferries indeed ran five PT-50a ,but none of them as Condor 5 because that was a RHS-160 delivered in 1976 (you can see it on — Mark van Rijzen (

PT-50 Model in Holland

PHM Model Planning Update

[31 May 01] We have a pretty good set of plans from “Floating Drydock” now. Floating Drydock is a Plan service company. They now have a couple different scale plan drawings and sets of PHMs: Hull, faired lines and stations USS PEGASUS Builders plans outboard profile and plan view, and deckhouse details, model builders set showing main deck, outboard profile bridge superstructure deck, platforms, some hull sections, general arrangements, and longitudinal cross section. Cliff Shaw is currently designing the jet pump. I gave him three or four size and scale options, and it looks as if we will be building at 1/48 scale. My job challenge looks as if it will be to keep the model weight below five pounds or 2.26kg. I don’t think that should be too hard, but I doubt we will have scale foil retracts on this model. lol! Wish us luck, I’m sure we will need it, and any advice you guys have to give. — Aimee Eng, Portland, Oregon USA (

Response…[15 Mar 02] Can I ask you how the building of the 1/48 scale USS PEGASUS R/C model is coming? I have seen one of these boats and have dreamed of making a R/C model of it, so ”Please”!!!! let me know. — Felix (

[27 Apr 02] Note the following references:

  • “The Mariners’ Museum’s Scale Ship Model Competition and Exhibition 2000,” Scale Ship Modeler (ISSN 1066-0275), Nov/Dec 2000 (Vol. 23, No. 5), pp. 36-37, 62. Features a 1:48 scale model of PHM-1 USS PEGASUS. Modeler Dean Leary of Statesville NC was awarded the Gold Medal under the Division I (Scratchbuilt) Class B (Powered Ships) category. “The Scale Ship Model Competition and Exhibition 2000 ran from June 17 until October 28, 2000. During these dates, visitors were able to see the top ship models in the world and participate in various activities associated with the exhibition on the opening weekend. For more information about the competition and exhibition, call The Mariners’ Museum at (757) 596-222 or (800) 596-2222, or write to: The Mariners’ Museum, 100 Museum Drive, Newport, VA 23606, or visit their Web site:
  • Marine Modeling Monthly, March 1991, contains photos and drawings of the PHM Class; purpose of the article is to provide details to modellers of the PHM Class.

— Barney C. Black (Please use the BBS to reply)

Modeling the Boeing Jetfoil

[20 May 01] I have had an interest in modeling the Boeing Hydrofoil for many years, but due to the pressure of work it has not been possible to pursue the interest with vigour. I am now close to retirement and feel that I can resume my interest. I have given some thought to the problem of inherent instability of the Boeing’s foil configuration. I wondered if model radio control aircraft type “flaperons” could be used? I have happened upon some old papers referring to “The Hydroflight Society”, in England linking with a ‘Peter Cahill’. Have you heard of him? If so, do you know if he is still active? Do you have any members in the UK, in the society? — Alan Barwick (

Responses…[20 May 01] I once saw an advertisement for “Hydroflight Models – Model Hydrofoil and Hovercraft Specialists – Incorporating the Hydroflight Society (the Society for Model Hydrofoil and Hovercraft Enthusiasts)”. This was in the April 1991 issue (volume 41 Number 482) of Model Boats magazine published by Argus Special Publications in the UK. At the time, a 48″ kit for a model of HMS SPEEDY, a Boeing Jetfoil variant was due to be available soon. I had advised Chris Morgan in the UK, another person who had made enquiries via the IHS, of the details above and the address of Hydroflight Models which appeared in the advertisement. Chris was subsequently able to make contact with Peter Cahill and sent me the following update via e-mail on 1 Feb 2000: “I have tracked down the owner of Hydroflight Models… one P. Cahill. His mobile is 0403 245280 and his home number is 01797 229120. The model company is now defunct, but he still makes the hulls and fins for SPEEDY. He is also developing a propulsion system for the model based on the original SPEEDY concept. He can do this as he has all of the technical manuals, log books, engineering drawings etc etc from the design, development, test, commissioning, service, de-commissioning and eventual sale. I will give you any more information when I receive it. Chris.” I have included Chris Morgan as an information addressee to this reply in case you don’t have any success contacting Peter Cahill yourself. If you manage to get an update on how Peter Cahill is going with the SPEEDY model, please let me know and post the information on the IHS BBS . — Martin Grimm, IHS member and RC hydrofoil modeler (

[7 Apr 02] Note the following reference: Radio Control Boat Modeller, Vol.1, No.4, May/June 1986. ISSN 0268-5248. Published monthly by Argus Specialist Publications Limited, UK. Features a short one page articles on the first successful model Jetfoil marketed in the UK, this being developed by Aries Hydrafibre of Portsmouth. The model designed by Martin Seymour is to 1:32 scale and was to be on sale from 1 May 1986 for a price of about 195 UK Pounds. The model is depicted in the article. — Barney C. Black (Please use the BBS to reply)

[28 May 03] An article on the Boeing Jetfoil appeared in the International Plastic Modeler’s Society Quarterly magazine, Vol. 17, No. 4, Summer 1982. No further info is available. — Barney C. Black (Please use the BBS to reply)

How to Build an R/C Model Sailing Hydrofoil?

[19 May 01] I have recently decided I’d like to build a radio controlled model sailing hydrofoil (about 1m, 3’4″ish, high) from scratch. I hadn’t seen any sailing hydrofoils before so was glad to see that it is going to possible (in some form at least). I intend to sail it in the stretch of the River Thames near home, so the model will have to cope with varied wind conditions and must cope with high waves/chop (up to 1 foot high) – ie waterproofing for radio and servos is probably required. Since I have not yet started, and am keen to learn new skills, I was wondering if you could give some suggestions on how to build this model and from what materials etc. Budget will be rather limited so if you could give some alternatives it would be much appreciated. Thank you all for your help (anybody wishing to mail me is very welcome) — Jez McKean (; Ashdown House, Basmore Lane; Shiplake on Thames; Oxon RG9 3NU UK

Response…[19 May 01] Some possible sources of info taken from the links section of our web page include The 750mm R/C Yacht Association at and Victor Model Products at and MicroSAIL at Please feel free to browse through the posted messages we have received over the years on this subject and to contact any of the correspondents directly that you think might have good info for you. Good luck with your project. When finished please send photo and summary of “lessons learned” for possible publication on the website and in the newsletter. — Barney C. Black (Please use the BBS to reply)

[22 May 01] It’s great that you have this interest in modeling an RC foiler. The conditions you refer to:1′ waves/chop with a 39″ model are extreme to the point of being impractical. Think about it: that would be like 12 foot waves on a 39′ boat!; this becomes doubly difficult in short period choppy conditions. The main problem is that to get the hull clear of the wave tops while foiling you will have to have an extraordinarily deep foil and that’s OK but the crux is that when you’re not foiling that vertical foil will be very deep and cause a lot of drag which will make it difficult to get up on foils in the first place. The other main consideration, in those conditions, is getting the center of effort of the sails too far away from the center of lateral resistance so that you may be forced to carry too little sail area to avoid excessive heeling moment. This can all be calculated relatively simply and should be foremost on your agenda as you get started. I would suggest designing a foiler a little longer and sailing in smoother conditions until you understand more about the boat you come up with.

I will try to give you some basic parameters that may help you. You have to decide on the hull configuration and it basically comes down to a catamaran or trimaran; I would suggest a tri about 1.2 times wider than it is long with amas (outside hulls) having a 16 to 18/1 beam to length ratio and a total buoyancy of about 75% of the all up weight of the boat. The main hull should, of course, support the whole boat without either ama in the water and have a beam to length ratio of about 12/1. Next you need to decide on foil type and configuration. The two main types of foil used on sailing hydrofoils are : 1)_”Bruce” (surface piercing) foils and, 2)-“T” foils. Bruce foils are generally used in a configuration of two forward on each side with a t-foil aft on the rudder or rudders. Bruce foils do not need an altitude control system since they are at an angle of approximately 45 degrees and are designed to rise up out of the water as the boat gains speed thereby reducing their wetted surface to a minimum and providing just the lift they need to.The problem is that they tend to ventilate (suck air and lose lift) easily, especially in waves. I would suggest using “t”-foils with a flap even though they are a little more complicated; they can be set up to provide a foil set that develops its own righting moment as it goes faster and they work real well on a model. The best way to learn about them is to go see a full-size RAVE hydrofoil and study how it is set up, especially the altitude control system.

Here are some facts based on our F3 that may help you: Configuration: two T-foils forward, one T-foil on the rudder. The forward foils are set up with approximately 2.5 degrees angle of incidence and are supported by vertical foils that develop lateral resistance; the vertical foils are located just forward of the center of buoyancy of the main hull such that the main foils support approx. 80% of the boat weight with the tail foil taking about 20 % (actually much less in practice since the rudder foil counteracts the pitching moment of the boat). The span of all three foils can be about 22.6% of the length of the boat, each. Flap area should be about 33% of foil area. We used a total foil area of 2.7% of sail area divided equally between all three foils. The rudder t-foil should be set at about 0 degrees angle of incidence. Weight should be referenced to sail area and you should have at least 196sq. inches of sail area per pound of displacement for winds between 0 and 7 mph with the ability to reduce sail as the wind picks up. The figures given here could produce a boat capable of taking off in a 5-6mph wind.

You might want to contact Dr. Sam Bradfield to ask permission to use brilliant and simple altitude control system for a one-off model; again the best way to learn about it is to see a full-size RAVE. Hope this gives you enough to start doing some serious planning: but remember the more you learn the better off you’ll be. Feel free to contact me by email, and and take a look at our foiler on our site at: — Doug Lord (

Need Source of R/C Receiver Plans

[1 Apr 01] Do you have or know where I can get hold of any RC receiver plans or circuits for my GCSE project? I have to build one rather than buy it. — Chris Hawkins (

VS-8 Radio Controlled Model

[21 Feb 01] My name is Antoine Lenormand, I live in France. I will receive a VS-8 ready to run from 32nd Parallel that I bought to a person in USA. It will be the first time I get into this hobby… I have no idea of the sailing characteristics of hydrofoil boats. I contact you to ask some advice about it. — Antoine Lenormand (

Response…[21 Feb 01]Hello Antoine, and congratulations on your VS-8 purchase. Unfortunately I have had no previous correspondence on this model, except brief correspondence with the 32nd Parallel company itself. They may be your best source of information and advice. They had a webpage for this model at, though it seems to have dropped off the web. We would like to receive your impressions and opinions on the VS-8 model in the future after you have had a chance to operate and become expert with this model… and don’t forget to send a photo or two! — Barney C. Black (Please use the BBS to reply)

Follow up…

[23 Feb 01, updated 11 Mar 01] I think 32nd Parallel Corp. will not answer any more….This company had huge problems… the website is closed, maybe forever Below are two photos of the model… “at sea” and “in drydock!” The photos are not mine, they are by Mr. Anderson (the past owner of the model). Also there are 2 pics of the internal arrangement. Notice that it is a single prop model (the real VS-8 had 2 props.) The boat needs a lot of power to lift off. You must reduce the throttle to prevent the prop from coming out of the water and losing thrust. The motor draws 50A to get on the foils! The most important thing to get a model that can run a long time is to choose the right batteries…I decided to try 2 types of Ni Cad, 2000 and 2400 mAh. After an overnight charging, I plugged the 2400 mAh 8 cells in the ESC. The TEKIN 432 Marine is a speed boats “dedicated” ESC : no reverse, 100 A max Amps…I will change it to a Robbe Rokraft… After SC adjustment, I applied full throttle. Noisy boat! The prop shaft was vibrating and heating a lot, something was not normal… I dropped off the shaft and noticed that it was bent. No problem, I changed it and tried again. This time no vibrations, but the shaft was as hot as ever. But in the water the shaft will automatically be cooled… I calculated the maximum run time with this kind of batteries: no more than 10 minutes! I will try something else to improve that. To be continued… — Antoine Lenormand (

VS-8 Radio Controlled Model

More on the Above VS-8 R/C Model

[30 Mar 01] Here is the next chapter of the hydrofoil review: First lake trials : First of all, wooohhhh !!! Impressive boat ! It is amazing to see this gray boat flying above the surface, everyone at the lake was impressed. But there are some technical problems…the run time, very short, no more than 5 minutes with a full charged 8 cells 2400 mAh NiCad… I noticed 2 major hydrodynamics problems : a loss of lift and “ventilation”. Let me explain: It is a V shape hydrofoil so it is not the most stable configuration. I must immediately reduce the throttle when the boat is lifting on its foils, otherwise it will lose lift and fall brutally. The ventilation is a strange phenomena due to the cavitation under the rear foil : a bubble of “vacuum” is forming under it and the boat, again, stalls brutally! I really don’t know, for the moment, how to do to fix these problems, but I keep looking for solutions. I will change the ESC and the motor, for a 2 motors and 2 screws configuration (it will improve the longitudinal stability). During the tests, its speed was impressive when the VS-8 was on its foils (2 times its speed when the hydro doesn’t fly !!!) but because of the instability I only could manage to run it during periods of few seconds above the water (the longest period was 10 sec.) — Antoine Lenormand (

Responses…[30 Mar 01] Three possible solutions: (1) move the center of gravity forward, possibly by moving the battery pack, etc.; (2) do not try to operate the model at too high a flying height by limiting the speed; (3) add a servo-operated flap for adjusting the trim attitude. With a V foil, as the boat rises higher in the water, the foils become ever more heavily loaded as the same weight is supported by less area, and eventually they ventilate or stall. If the boat is allowed to pitch over to a smaller angle of attack at higher speeds, the flying height is lower and the foils are less heavily loaded. Also, as the boat rises, the submerged span of the V-foils reduces, which greatly increases the drag due to lift. The boat may actually go faster with more foil in the water because of this. — Tom Speer ( website:

[1 Apr 01] From my experience with the 1:20 scale RHS 140 model I fully agree with Tom Speer that you should try to experiment with shifting the centre of gravity of the boat forward if the bow foils rise too rapidly and flies too high after power is applied. Indeed, I also moved my battery pack forward as Tom suggested to you. On my model it is possible to adjust the angle of attack of the complete bow foil assembly and to a lesser extent the aft foil. This gives further options to experiment and find the best set-up for good foilborne running. From the photos of your model, I don’t know if that is so easy for you to do. Although I found the inclusion of flaps as Tom suggested too complicated for my model, you could still achieve the same result by incorporating thin alloy trim tabs on the aft end of the bow foils which can then be bent up or down slightly by hand between trial runs of your model.

The ventilation on the aft foil of your model which you have described could be due to any number of reasons. My model was also prone to such problems. If the aft foil rises too high and near to the surface, the propellers would then suck in air and this would be immediately apparent with the motors racing and the water behind the model being churned up. I suspect the foils of my model have also ventilated from time to time as the low pressure on the top of the foil causes air to be sucked down from the water surface, particularly as these foils are surface piercing anyway. This in turn causes a sudden loss in lift and the model can plunge unexpectedly. My model is fitted with what are called ‘fences’ on the foils and rudders. These are also fitted to full size hydrofoils to avoid ventilation of the foils by blocking the path for air to be sucked down. I didn’t think the model would require them but added them all the same so that they would look more realistic (the fences are also fitted to the full size RHS 140). You can see the series of fences fitted to the twin rudders on my model if you look at the aft foil photo in the Photo Gallery (under model hydrofoils) on the IHS website. The fences are also fitted to the upper sides of the bow and stern foils though they are not clearly visible and some were missing when the photos were taken. The fences may help avoid ventilation but two fellow hydrofoil modelers and IHS members in Denmark, Soren Struntze and Hans Jorgen Hansen, have had perfectly running surface piercing hydrofoil models without requiring fences to be fitted.

My model also does not run for very long on its pair of 1700 – 1800 mAh NiCad batteries, unlike those of Soren and Hans which run faultlessly for a considerable length of time. My suggestion is that you experiment with different centre of gravity positions, foil set-ups and propellers types (try changes in pitch and diameter) until you achieve the best performance. You need to be patient with this and visit your local pond many times!

— Martin Grimm (

PT-50 Model

[04 Mar 01] Just to let you know I have found a PT50 built and painted as per the box on the IHS website. I have not flown it yet but the chap who built it says, it is very fast – it has done a Barrel Roll due to having a new motor fitted. I have also found a German hydrofoil kit of a river police launch a little larger than the PT50 which I may build later. I will keep in touch after my first flight. In interest, the chap on your web with a PT50 states he has never heard of one called Condor. Actually, Condor Ferries ran no less than five of them! I have asked for some pictures for your files. — John Leaver (

Responses…[4 Mar 01] I am curious about the German hydrofoil kit of a river police launch a little larger than the PT50. I wonder if it is just the size of the model which is larger (due to its scale) or whether it is a model of an actual hydrofoil larger than the PT50? I recall the Hessian Water Police in Germany operated three of the small Supramar PT3 hydrofoil launches on the Rhine. Details were provided in an article in Hovering Craft and Hydrofoil, Vol.2, No.4, January 1963, pp22-23. — Martin Grimm (

[31 May 01] Hans Jorgen Hansen from Denmark was kind enough to provide a copy of “Hydrofoil PT-50” by Colin Gross, Model Boats magazine, Model & Allied Publications LTD, PO Box 35 Bridge ST, Hemel Hempstead, Herts, HP1 1EE, February 1981, Volume 31 No. 360, pp. 80-82. IHS has forwarded this to John Leaver. The article is informative about the experience of assembling the model, and it contains several suggestions for modifications, for example, “The bost useful modification to improve the performance of the model is to replace the stiff spring coupling between the motor and the prop shaft.. Unfortunately, the usual Ripmax/Huco universal joints do not come in the correct size. However, if two type KC42 couplings are purchased, one may be opened out to fit the prop shaft, and the other to fit the motor. When joined by the couple converter, the new coupling can still be fitted to the model by pushing the motor forwards in its clamping brackets.” According to the article, the manufacturer of the kit is Sanko Seimitsu Co. Ltd, Japan. It was imported into England by Richard Kohnstam Ltd. The kit price in 1981 was £59.99 — Barney C. Black (Please use the BBS to reply)


[25 Feb 01, updated 27 Sep 02] Attached are some images of my 1:20 scale RHS 140 CURL CURL model. I have particularly included some photos of the foils looking from the underside of the model to give a better idea of the layout of typical surface piercing hydrofoils. Also, I have included a view inside the hull of the model showing the arrangement of the RC gear and pair of electric motors directly driving the propeller shafts. Click Here for more descriptive details and “Lessons Learned” from trials (99kb Adobe Acrobat file). The speed controllers are fairly simple two-stage forward and reverse units which are those used for cheap RC cars and buggies. Perhaps I will get this model finished one day!

The model is in fact scratch built based on a small general arrangement drawing that was published for the RHS 140 series as well as a variety of photographs I took of CURL CURL while that hydrofoil was still operational in Sydney in the late 1980s. Consequently, the model is not available in kit form. I had started to prepare a plan to 1:20 scale to work from but never finished that to the point that all the construction details were shown, rather, I just started to build the model from a number of separate part templates I prepared. It has always been my intention to finalize those plans so that others could also build a model from them. I also wrote up some notes on the construction and testing of the model. Unfortunately the notes were on a computer that is no longer running so may have to be re-written. The model is largely built of plywood and the foils are also wood with metal rods at the leading and trailing edges to reduce impact damage. Other parts are fabricated from plastic or meal. The choice of materials for my model was mainly due to my lack of access to metalworking machinery. It operates on a 3-channel radio control set-up. One servo to control power to each motor / propeller and one servo for rudder control. It could be run on 2 channels without problems (no independent control of port and starboard shafts). I enjoy running the model but unfortunately that is fairly infrequent. It is somewhat of a crowd pleaser as hydrofoil models are fairly rare just as their full scale counterparts are in Australia. I last took my model out in August 2000 and unfortunately ran it aground. The damage was not major but I have been slow to repair the model. The model runs on two electric motors driven by a pair of 7.2V 1800mAH NiCad batteries. On a good day it runs foilborne very well but on other days it is stubborn! The main limitation is that I would probably not achieve much more than about 10 minutes of foilborne operation before the pair of batteries are running low. I have three sets of batteries to change over for that reason. The choice of electric or internal combustion motor for hydrofoil models is a hard one. Electric models are easy to start and run but have relatively limited endurance. IC engines solve the endurance problem and have plenty of power available but then you have to deal with issues such as engine cooling, oil, exhaust, noise, vibrations and difficult starting the engine(s). If you download the Dec 01 issue of the free on-line magazine ‘Classic Fast Ferries’ at you will be able to read about a nice, but also unfinished, scratch built scale model of a PT 50 powered by a chainsaw motor. That model is owned by Garry Fry in Sydney, Australia. There have been some hydrofoils manufactured as Radio Control model kits but I am unsure whether any of them are still in production. On the IHS website you can find examples such as a PT 50 kit manufactured in Japan many years ago and a German VS-8 military hydrofoil of WW2 released as a kit some years back but now no longer in production. It may be possible to obtain such a model by keeping an eye out for them on internet auction sites such as EBay. A final suggestion is that there was a German company that distributed plans to build a semi-scale model of the Supramar PT.20 hydrofoil that is similar but smaller than the RHS 140. That model is intended to be operated with a small IC engine similar to those used on RC model aircraft but water-cooled. The company is: Verlag fur Technik und Handwerk GmbH, and the model plans are: Bauplan MT-160.– Martin Grimm (

Jetfoil Model

[15 Feb 01] Back about 1980 I built a Boeing Jetfoil to a scale of 3/8 I think, any way it turned out about 35 inches long by about 12 inches wide. This was powered by a 61 glow plug motor and water jet, as per full size craft. The jet unit took some years to perfect in itself as there was none on the market at that time. I also played with gyros and various servos in an attempt to keep it upright, but with no luck, even using the direct control from the Tx to stabilize it, the whole thing was a bit too quick in its movements to control. However after various attempts at foil control stability (or not) the project was shelved after some 5 years. I still have 002 in its box. Your site has inspired me to have another go. If any one cares to contact me discuss it feel free. — Martin Seymour (

Response…[15 Feb 01] IHS member Harry Larsen, who knows a lot more about the math of control systems than I, reckoned that his 4000lb TALARIA III would double its angle of roll in about 1/2 second. If it got to 10 degrees of roll, the flaps couldn’t hold it. Even though he was riding it and could feel its lean, he only once drove it without automatic roll control, and after 2 minutes he was exhausted. A 35 inch model will be impossible to control by hand. You will need a fast servo controlling the flaps. You can buy a solid state helicopter gyroscope and a tilt sensor from Analog devices, available from Maplins. I can program a microcontroller to join them together if you want. How were you controlling the ride height? — Malin Dixon (

[16 Feb 01] I was wondering if you have scaled your designs up to about a 15 to 16 passenger size. This would likely be 35 ft boat or so. I am considering building or buying such a boat for use on the US west coast. I would love to see a photo of your smaller one if you can. — Robin (

PT-50 Model Kit Wanted

[13 Feb 01, updated 17 Feb 03] I am looking for a model PT50 hydrofoil. Can you tell me if you know of any for sale in any condition? – John Leaver ( [This email address for John Leaver is no longer functional – Editor]

Response…[13 Feb 01, updated 17 Feb 03] I don’t know of any model PT50 kits being sold today. We have two photos of such models in our Photo Gallery. One came from the Ebay auction site ( when a person sold one of these kits. The other was sent in by an adult in the Netherlands who got his kit as a child, and does not remember the source. I expect that another of these kits will go up for sale on eBay, but it may be a long time. I have only seen one in nearly two years of watching this site. The only thing I can suggest is to find a store that sells models and ask if there is any kind of national database of discontinued kits that are available for sale. There may be some kind of a search service available similar to the one for old books. If there is such a service or database, I would like to know about it for the information of our members and visitors. One note of caution: If you get an offer to sell you a model in response to this posting, be wary about giving out credit card numbers or sending off a lot of money in response to email offers from individuals who do not operate an established internet business and are not located where you can physically see the model in a public place. In such a circumstance you could suggest to the seller that he list the item on eBay, and then use the payment escrow service offered on the eBay site to be sure you get your merchandise before the funds are released. – Barney C. Black (Please use the BBS to reply)

Modeling the DOLPHIN

[18 Jan 01] Did the DOLPHIN MK 11 hydrofoil ever go into commercial production. I started building a model in 1977 and have just pulled it out for completion/refurbishment. Do you have any source of information relating to any of these in service or was it just a prototype? — Tony Morling (

Response…[18 Jan 01] I am not familiar with the MK 11 designation, but if you are talking about the Grumman DOLPHIN, then here is a quick overview: The prototype was completed in 1966 and subsequently saw service in the Canary Islands off the coast of West Africa. After eleven months of troublesome operation due to design “bugs” and interruption of schedules due to difficult sea states, the operator Maritima Antares returned the vessel to Grumman. A second vessel of the class was consequently abandoned in the construction phase. DOLPHIN was then named GULF STREAK and operated by Bahamas Hydro Lines on a run between Miami FL in the USA and Freeport in the Bahama Islands. Again, frequent turbulent sea states made it difficult to keep a regular ferry service schedule. In 1969, DOLPHIN moved to the Virgin Islands, where it operated a seasonal ferry service between St. Thomas and St. Croix. In December 1970, the vessel was sold to the US Navy, which moved it to San Diego where it was partially cannibalized for equipment needed in other Navy hydrofoil development efforts. There is a good B&W photo of GULF STREAK in the 1969-70 edition of Jane’s Surface Skimmer Systems, and there are line drawings of the vessel in the 1968-69 edition of the same. Another photo and the above text is posted on our website. — Barney C. Black (Please use the BBS to reply)

[16 Feb 01] I am a member of the International Hydrofoil Society and have recently ready your posted message on the IHS website about the Dolphin Mk 11 hydrofoil model you are planning to complete. I thought I might have a clue as to where the Mk 11 designation you mentioned may have originated from: Grumman had in the mid 70’s proposed to develop a FLAGSTAFF Mark 11 Patrol Hydrofoil which was to be a modernized and upgraded version of the PGH-1 FLAGSTAFF. The FLAGSTAFF patrol hydrofoil built in 1968 had many design similarities with the Dolphin passenger hydrofoil built two years earlier. The FLAGSTAFF Mk 11, which was also referred to as the SUPER FLAGSTAFF, was to have had a greater payload and range than the original FLAGSTAFF. According to Jane’s Surface Skimmers 1974-75 the principal differences between the upgraded hydrofoil and its predecessor were to be a gas turbine of greater power output, an improved right-angle drive for the propeller shaft, and the use of larger foils and struts. This would have enabled the full load displacement to increase from 67.5 tons for the FLAGSTAFF to 83.5 tons for the Mk 11. Although Jane’s ’74-75 indicates that the development of the Dolphin class had been discontinued, it is just possible that the improved design features developed for the FLAGSTAFF Mk 11 prompted Grumman to resurrect plans for the commercial variant of the hydrofoil as a Dolphin Mk 11? The FLAGSTAFF Mk 11 was never built. For additional information and photos of the sole Dolphin that was completed, download the January 2001 issue of Classic Fast Ferries available at Was the model you started building in ’77 from a kit or did you construct it based on drawings that were available at the time? That may help to clarify where the Mk 11 designation originated from. In any case I would be interested to hear more about your model, as I am sure would other hydrofoil modelers. — Martin Grimm (

Model Building Techniques– Scaling Lessons Learned…

[10 Dec 00] I of course try to design my models as close as possible to the state-of-the-art (full size) ORMA 60 trimaran yachts, but there are also some fundamental differences, mainly regarding building techniques and achievable weights. The basic relationships apply, as the physical laws are the same for 60ft – or 2M, 6ft, or 4ft models. The aim for the models is to get the models as close to the full size vessels as possible. For the relation of 60ft to 4ft, the scale is 15:1. Since ships are three-dimensional structures, you have to calculate: 15x15x15 : 1= 3375 : 1. So for overall dimensions like: length, width, height, the scale remains 15:1, but for the sail area it becomes 15×15:1 = 225:1 and for the structure and their weights it is 3375:1. Now if you look at the currently achieved weights of ORMA 60s, you’ll find weights between 5.1 tons (or 5100 kg) and 6.6 tons (or 6600 kg). 5100 divided by 3375 is only 1.51 kg and this weight has never been achieved by a fully functional 4ft. scale model. Even if you take the high end of the ORMA 60 weight range (6600 kg) and divide it by 3375, you’ll get only 1.95 kg; almost impossible to build/achieve. Actually achieved weights are between 2.25 and 3.0 kg. Now turn it the other way round: The R/C set of a 4ft trimaran including batteries and sail winch weighs about 0.33 kg. Multiplied by 3375 to scale up to full size, it would become 1113.75 kg or 1.1 tons… that is a weight of equipment for an ORMA 60 that is never reached in reality. Now you’ll understand that our models cannot really be designed and built as real “scale” models to ORMA 60s. They need to be designed to their actually achievable weights. And if you miscalculate the volume of the hulls to about 0.2 to 0.3 kg to the actually achieved weight, your boat won’t sail safely at all. Have a look below at the weights of the single (full size) components, then to the corresponding scale weights that would be ideal. Now take a look at the weights I have actually achieved, which are — I believe — the lowest weights ever achieved:

  • FONCIA: Floats: 500 kg each; Crossbars: 500 kg each; Mainhull: 1000 kg; Mast: 750 kg
  • BANQUE POPULAIRE II: (remember, this ship was destroyed in it’s first race) Floats: 420 kg each; Crossbars: 460 kg each; Mainhull: not sure (800 to 900 kg); Mast: not sure (650 to 750 kg)
  • GROUPAMA: (here I got most data, but I’m not sure how reliable they are) Floats: 400 kg each; Crossbars: 400 kg each; Mainhull: 800 kg; Mast: 650 kg; Centerboard: 150 kg; Forestay, shrouds, and hydraulics to tilt the mast: 400 kg each

For the 4ft models, the ideal weights therefore should be:

Floats: 0.12 to 0.15 kg each – achieved weights 0.25 kg (!) (each one is the achieved minimum!)Crossbars: 0.12 to 0.15 kg each – achieved weights 0.15 kg

Mainhull: 0.24 to 0.30 kg ——- achieved weights 0.50 kg (!)

Mast: 0.19 to 0.22 kg ——- achieved weights 0.25 kg


Total: 0.91 to 1.12 kg ——– achieved weight 1.55 kg


As you can see, these are only the main components. A lot of other parts relate in the same way: rudder, centerboard, centerboard trunk, boom(s), sails, forestay and shrouds and so on. The achieved weight that is most irritating to me is the weight of the crossbars! Although these parts are the most difficult ones to build, I almost achieved the ideal weight. So the (maybe strange and maybe wrong) idea came up in my mind, these crossbars could be too weak. It would be bad if they bend too much, but even worse, if they break! But they SEEM to be strong and stiff enough (according to my tests) This then would mean all hull shells I had built so far although they are very light already – must still be far too heavy. That is one more reason, why I left the workshop alone for some time and went back to drawing and calculating again. Unfortunately, it also confused me quite a bit; and held me back from continuing the model itself. Fact is, not one R/C trimaran model-builder except me (neither for Mini40, Formula 48, 2M nor for any other size) has been willing so far to share the actually achieved weights of his own models with anybody else. The R/C multihull enthusiasts should be able to work together and help each other. So I will simply publish my own data from now on, and others can compare my modeling results to their own. I hope some good discussions will happen in the near future. I also will publish all data of my older and bigger models and also of my new (although I started to build it two years ago) 2M carbon trimaran soon. — Ernst Zemann (

Modelbuilding Scaling Lessons Learned

[18 Jan 01] I have read the posted message of 10 Dec 00 by Ernst Zemann (above) and offer this reply, I know it is fairly lengthy! Ernst indicated that in his experience it is not practically possible to achieve a proper scaled weight for an ORMA 60 trimaran yacht model of 15:1 scale. While I have never built a sailing yacht model, I have in the past built RC model aircraft and an RC scale model of a hydrofoil passenger ferry. I thought it may be an interesting contrast with the ORMA 60 models to look at the achieved weights of those models compared to their full scale equivalents.

Looking first at a scale aircraft model. I have built a 1:6.75 scale de Havilland DH82 Tiger Moth bi-plane model from a kit. This model is powered by a .40 size two stroke internal combustion model aircraft engine. With a full tank of fuel and all radio control equipment fitted (4 channels with servos), the model weight is about 2.500 kg (the plans suggest anything in the range of 2.3 to 2.5 kg). By comparison, the maximum takeoff weight of the full scale DH82 is variously listed as being 803 to 827.8 kg which, when scaled down to 1:6.75, would correspond to 2.611 to 2.692 kg (up to 7.7% more than the actually achieved model weight). It should be noted that the Tiger Moth can carry two people at say 75 kg each and that would make up part of the full load weight of the aircraft. At model scale these two people would correspond to a total of 0.488 kg whereas my ‘equivalent’ of a pilot is the radio control equipment (quite old gear with a large battery and servos) which weighs around 0.550 kg. In any case, this example demonstrated it is possible to build a scale aircraft model to a weight less than the actual aircraft weight scaled down to model size using scaling laws. This seems surprising given that full scale aircraft are typically already lightly constructed. The model in question is quite solidly built, though the wings and fuselage consist largely of fabric covered balsa wood. The reason the model can be built to less weight than its ‘scaled weight’ is perhaps explained by strength considerations as discussed at the end of this message.

Turning now to my 1:20 scale model of a Rodriquez RHS 140 hydrofoil passenger ferry. The initial intention was to ensure that the model weight was correctly scaled and therefore that the model floated at the correct waterline. As the full scale vessel displaced 65 tons (or about 66 tonnes) fully loaded according to Jane’s Surface Skimmers 1974/75 the corresponding model weight could therefore be permitted to be up to 8.250 kg*. If it was less than this weight, then ballast (or preferably more batteries to give improved endurance) could be added to achieve the correct scale mass.

* Note: For model resistance testing, which is usually performed in fresh water towing tanks, the test results are usually extrapolated to the full-scale craft operating in salt water. For such tests the model should float at the correct waterline corresponding to the full-scale hydrofoil operating in salt water. As a consequence there is a slight correction that needs to be made to the model mass to account for the difference in water density between fresh water (~1000 kg/m3) and salt water (~1025 kg/m3). The 1:20 scale RHS 140 model would in that case be ballasted to: 66000/203/1.025 = 8.049 kg.

During preliminary trials of the hydrofoil model before it was fully completed the performance was found to be somewhat sluggish at a weight of only 5.500 kg. This was considered to be due to the insufficient power available from the twin electric motors used to propel the model and also a less than optimum choice of propellers. I therefore accepted that the model weight should remain less than the properly scaled weight to maintain a reasonable foilborne performance. While the model has not been completed yet, the final weight is estimated to be 5.920 kg. A breakdown of this weight is as follows:



% of total







Forward foils and cross beam



Aft foils



RC receiver, servos, RC batteries etc



1800 mAh NiCad batteries (2)



2x Motors and controllers



Deck fittings



Shafting, propellers, and couplings



Tubing for fenders etc.



Stainless steel hand railing






This is only around 72% of the correct scaled weight so the model could in this case again be built to less than the scaled weight. There is at least one reason why such a light weight could be achieved. This is simply that the model does not have to contend with 140 scaled down passengers on board (that being the maximum capacity of the RHS 140). At full scale these would weigh around 10.5 tonnes while the correctly scaled passenger weight at model scale would still have amounted to 1.312 kg. Of course my model does not have dummy passengers nor does it have any interior outfit, all of which would have added weight to the model and brought it closer to the scaled weight. At the start of the project to build this model, I estimated I had plenty of weight budget to spare and therefore I did not skimp on the hull construction material. The model is therefore quite solidly built from 2.5 mm plywood. The foils are solid wood construction with steel rod reinforcement at the leading and trailing edges. Once again, it can be seen that it is relatively straightforward to build a scale hydrofoil ferry model at a weight that is less than that of scaling down the corresponding full scale hydrofoil displacement. Fellow hydrofoil modellers in Denmark have built much lighter models than mine despite their being of a similar size. In one example, this has been achieved even though a high degree of detailed outfit has been included on the model. Some of these models are built of light alloy sheeting.

Ernst remarked with some satisfaction that he has managed to achieve the weight target on the crossbars of his ORMA 60 yacht model. This has reminded me of an interesting result I once stumbled across when it comes to scaling of strength between model and full scale craft, or for that matter from one size of hydrofoil to a larger geometrically identical one. It turns out that if an identical material is used and the construction of the structure (be that a foil or a cross bar) is also accurately scaled, the model will experience less stress that the larger scale equivalent for the same scale loading cases. I will use as an example the stress in two cantilevered beams being equivalent to one another except that they are at two different scales:

The smaller beam is solid aluminium alloy, say 6062-T6 grade with a yield strength of 110 MPa and Youngs Modulus (E) of 70 GPa, and has a cross section of 10 mm x 10 mm and a cantilever of 1.0 m span. One end is rigidly fixed to a wall. On the other end of this horizontal beam a mass of 1 kg is suspended. The maximum stress in the beam develops at the wall end and can be calculated by applying a common engineering formula:

Stress = M.y/I (Pascals)

where:M = the moment exerted in the beam at the wall end = mass x gravity x Span = 1.0 x 9.81 x 1.0 = 9.81 Nm.

y = the distance from the Neutral Axis of the beam cross section to its extreme fibres, which in this case is half the height of the beam or 5mm (0.005m) since the neutral axis lies at the centre of this symmetrical section beam.

I = the Moment of Inertia of the beam cross section. For a solid rectangular cross section this is given by: b.h3/12 where b is the base width and h is the height of the cross section of the beam. Hence I = 0.01 x 0.013 / 12 = 8.3333×10-10 m4.

Consequently, the stress in the beam is:

Stress = 9.81 x 0.005 / 8.3333×10-10 = 5.886×107 Pa or 58.86 MPa

Now, if we double all the dimensions of the beam and cube the mass suspended from the beam (following the reasoning of mass scaling given by Ernst), the beam cross section is now 20mm x 20mm while the span is 2.0 m. Of course the weight suspended from the beam is now increased by the dimension cubed, so it becomes 1 kg x 2 x 2 x 2 = 8 kg. Repeating the above calculation process for the larger beam and mass we now get the following stress in the larger cantilevered beam:

Stress = 156.96 x 0.01 / (1.3333×10-8) = 1.1772×108 Pa or 117.72 MPa

So it can be seen that the stress level has doubled rather than remaining constant as may at first have been expected. The example is such that while the smaller scale beam is still well below the yield stress, the larger scale beam has exceeded the yield stress for the same alloy. Taking this result the other way, the structure of a model in some instances can be built to less than the geometric equivalent thickness if the same material is used, or alternatively, a weaker material can be selected. A good example of this is the pair of foils on my 1:20 scale RHS 140 model. While the foils supporting the 65 ton full scale RHS 140 are constructed of hollow welded steel, the scaled foils for the 5.5 kg model are instead constructed mainly of solid wood. These foils have been demonstrated to be sufficiently strong even when the model has been tested by towing it in rough head seas when the model was ballasted to its correct scale weight of 8.25 kg. If the full scale hydrofoil had employed solid wood foils rather than steel foils, they would surely break on the first attempt to lift out of the water when becoming foilborne!

Returning to the example of the two cantilevered beams, it is also worth looking at how the deflections at the tips of these two beams compare to one another when the mass is applied. The formula for the tip deflection of a cantilevered beam with a load applied at the tip is:

Deflection = F.L2/(2.E.I)

where:F = The force applied due to the load, ie 1 x 9.81 = 9.81 N for the smaller beam case.

L = The beam length or span = 1 m for the smaller case.

E = Youngs Modulus for the beam material = 70×109 Pa or 70 GPa.

I = Section modulus of the beam as defined previously

Now, for the smaller beam, we have a deflection of:

Deflection = F.L2/(2.E.I) = 9.81 x 1.02 / (2 x 70×109 x 8.3333×10-10) = 0.084 m = 84 mm

Likewise, for the larger scale beam the deflection is 168 mm or twice as much as the smaller beam. So, just as with the stress level, the deflections increase in proportion to the scale. It must however be appreciated that allowable deflections for engineering design purposes are usually related to the size of the structure itself. In this example it can be seen that the deflections remain in the same proportion as the dimensions of the structure so are not a bigger problem at larger scale than at the smaller scale. — Martin Grimm (

Update on PHM Model

[8 Sep 00] We are currently trying to research the water jets. However my engineer is currently building a kit plane and his free time for other projects has disappeared. Our hope is to continue this project as time permits. Meantime we are all focused on other projects, models and work. Thanks for the message I will forward it to our crew — Aimee Eng (

Hydrofoils, Inc. Discontinues R/C Model Product Line

[27 Jun 00] I have tried to contact Hydrofoils, Inc. They are mentioned on your site as manufacturer of a very interesting R/C electric hydrofoil. Unfortunately I heard from someone that they don’t deal with and don’t build the R/C models anymore. Do you still have any contacts to this company? Do you know if there is any of these models in stock anywhere, maybe a last surplus at Hydrofoils Inc.? Can you please help me in solving this puzzle? — Thomas Lange (

Response…[23 Jun 00] We are not selling models anymore, and are currently concentrating only on the ferry industry. Our current business focus is on larger, high-speed marine transportation industry as indicated by the 100-kt ferry on the front of our web site home page. We no longer have the models, smaller hydrofoils, parts, or plans in production. We will advise you should we reenter that market. — Ken Cook, Hydrofoils, Inc. (

Radio Controlled Model Kit Wanted Found!

[4 Jul 00] I have been looking for a radio controlled hydrofoil kit for some time, without luck – are you aware of any available? — Nick James (

Response…[4 Jul 00, Updated 26 Feb 01] I suggest you contact the IHS photo archivist Malin Dixon because he is personally involved in motor-powered R/C model hydrofoil boats. There are only two R/C kits I know of personally; one was offered by Hydrofoils, Inc., but they have recently discontinued their model hydrofoils to concentrate on full size ferry vessels. The other is a historical reproduction of the German VS-8… from 32nd Parallel, whose website at seems to have dropped off the net recently. There are some R/C kits, discontinued now, that can still be obtained… Shockwave, PT-50, Super Comet, etc. From time to time one of these will show up for sale on the Ebay auction site. There are photos in the IHS photo gallery. There have been articles with plans in modeling magazines such as Marine Modeling Monthly (Traplet Publications UK) about building hydrofoil R/C boats, see Graham Taylor’s RAPIER and MK1 as two examples. I have presumed that you want a motor powered boat. If it is a sailboat you want, take a look at the 750mm site in Australia. Hopefully this info is of help to you. If you encounter any other hydrofoil model products or websites in your search, please let me know about them so I can cover them on our site. — Barney C. Black (Please use the BBS to reply)

[26 Feb 03] I thought I’d write just to let you know that after 22 years of searching ( and 3 years since posting my original email on IHS) I have finally managed to find a Super Comet PT50 model. I was approached by email in response to my posting here, and I took a risk – after 22 years I thought it was worth it, and the model arrived today. It was found in a model shop in Italy, and it looks as though all of the parts are there including the assembly instructions and decals. I’ll post some pictures when completed – hopefully in a month or so. Thanks for your help in finding the model.

[2 Jun 03] Thought I’d just send you a picture of the completed Condor 1. The kit has been great fun to put together and was very well engineered despite the age of it. Trials have been extremely successful with the boat going straight up on its foils and even turning without coming off – a problem which I believe these models suffered from. I think the modern equipment I’ve used has helped – the motor is more efficient as is the electronic speed controller – and the weight has been reduced as well. — Nick James (

750mm Radio-Controlled (R/C Model Sailing) Yacht Web Site

[3 Jun 00] Please check out our site for possible inclusion on your links page? We have been using inverted T-foils on our rudders for years to prevent nose diving. — Malcolm Smith, Secretary, 750mm R.C. Yacht Assoc. (

Response…[3 Jun 00] We have added a link to your interesting site as requested and are especially interested in the sub-page on future developments for fully hydrofoil-supported variants.

Source of Model Testing

[18 Feb 00] I thought, it could be of interest for you, that there is a lot of model-building and -testing going on here at Vienna/Austria, though it’s far away from the main boatbuilding places! – If anybody has a new design and wants to test a small version, before he starts the REAL one, feel free to contact me; – don’t forget, a model of 2 meters is only 1/125 expense of a real 10 Meter Yacht. I’m building these models on request, but also to have a comparison to the speed and performance of the outrigger boats (proas – models and big ones up to 33 ft this far) I’m building. In spring I will start to build a NEW, bigger, faster and lighter Proa – so if you are interested, please reply to me. It’s a cold and lonely place right now here at Austria for a boatbuilder. — Ernst Zemann ( website: ( [The webpage is no longer operative. Instead try – Editor]

Response…[18 Feb 00] Thanks for your proposal, but I have the same service in France… One of biggest model building company in the world and an hydro laboratory are offered to me a free service using engineer students to realize it… All my passed boats have been model tested… It’s a good way to get some information on realité of the VPP. If you request some information on proas, don’t hesitate to ask to me. — Guy Delage (

Source of PT-20 Model Kits

[1 Mar 00, updated 10 Dec 00] I have a German model magazine where I can order a blue print, parts list, and description how to build a model PT-20 Tragflächenboot (hydrofoil) for about US$15.00. The model is 1:25 scale, 83 cm long, 30cm broad. Also some hovercraft model plans (SRN-1 US$15.00 and Bell SK 5 US$25.00 in French), warships, towing, sailships, airplanes, and even engines… more than 2000 different plans! For who is interested I can scan the list of models. Here are the addresses for ordering the plans:

Phone: 07221-508722; Fax: 07221508733; E-mail:; Address :Verlag für technik und handelswerk GmbH, Bestellservice, D-76526 Baden-Baden, Germany

That is their head office. One can also order plans in Holland: Phone :0031-294-450460; Fax: 0031-294-452782; E-mail:; Address :De muiderkring BV, Postbus 313, NL-1380 AH Weesp. They both accept: Eurocard, Mastercard, Access, and Visacard. — Mark van Rijzen (

Hydrofoils For R/C Model Sailing Catamaran

[21 Jan 00, updated 5 Feb 01] I was hoping to add hydrofoils to my new 2m sailing boat. It seems its much more complicated than I thought. I am worried about stability. The model is six foot long with out riggers six foot wide with a mast of about nine feet. The hulls are about eight inches wide. So its very wide for its length and weight. I am worried that the foils will just make it skim on top of the water. Is it just trial and error to get the angles at the proper angle? Its like I just entered a different world, there is so much to know, but it looks fun. Please look at the web site, they are the fastest model sail boats on earth, without hydrofoils. R/C Sailing – — Jerry H. Grigg (; Fax: USA (916) 721-1417

Response…[21 Jan 00] You will need a height control system and a roll control system if you are to have fully submerged hydrofoils. It is no good to just fix the angles; you need to reduce the angle of attack of the front foils as the boat lifts to its correct flying height. A simple skate has been used to control the front foil angle for ride height control in TALARIA III, a converted Bayliner, and on Trampofoils, a human powered hydrofoil, and several others. A skate runs on the water in front of the hydrofoil, and this is attached to the front foil so that the height of the skate alters the angle of the front foil. This controls the height of the front, and the back follows the front in height control, just as the front follows the skate. The roll control is more difficult. In TALARIA III an electronic control system was used to control flaps on the rear foils to stop it falling sideways, and on the Trampofoil it was up to the rider to move up to the high side if it started to roll. The wide wing, low speed and the undivided attention of the rider on the Trampofoil made this possible. A skate on each side has been used, as in HALOBATES (see for the pictures, but the skates tend to get very large if you are trying to control the angle of larger rear foils. You can’t get the amplification affect of the ride height control with a fixed rear foil, which relies on the rear foil having a larger angle of attack when it is deeper, which is true if the front is held at a fixed height. In a sailing boat, there is a large roll torque from the sail, so you want to run with much more lift on the lee side, and probably down force on the windward side, although that can be a bit dangerous, because if you lift a foil out of the water there is no downforce and you capsize. Anyhow you need to alter the angles or flaps of the main foils to counteract the torque from the sails. This will have to respond too quickly to do by hand. Our model used a “heading hold” gyroscope, with a trim input from an accelerometer that measured the tilt. The gyroscope was mounted with its axis fore – aft, as it was holding that axis steady, while it was designed to be used in a model helicopter with its axis up – down, preventing spins. There was a fast servo connected to the output of the gyroscope, and that altered the angle of attack of the foil tips, one up and one down, like ailerons on a plane. Many sailing hydrofoils use V-foils, often mounted far from the center of the boat to give roll stability. As the boat rolls, the down side has more wing in the water, so more lift. They need to be very wide but they don’t need a control system. Email me if you have any more questions. — Malin Dixon (

To Build a PHM Model

[29 May 99] I have been researching the possibility of constructing a scale model of the Boeing PEGASUS hydrofoil. I have some line drawings from Floating Drydock. Some of the things I haven’t been able to find is good documentation of the hull form, I am looking for hull stations/frame plans. And the stowed configuration of the foils. If any of this information is available to the public, I would like to obtain some scale line drawings showing this data. If you have an Index of the available information pertaining to these boats and their schematics I would like to browse that file and possibly request other data and drawings. I have included photos of two other model ships I have built. Both are 1/72nd scale. The larger being 6′-6″ +/- long. Both are classified as is classified as “combat model warships”. The Romani class light cruiser is armed with four semi-automatic 7/32nd ball bearing guns. They operate off a 12 oz CO2 tank firing two cubic inches of air per volley. Only the number one and four turrets are armed. If the ship takes damage during a competition there are two water activated bilge pumps just forward and aft of midship. The ship is powered by a 6volt 7-10amp battery and two pitman 24v motors. It will run a scale 41kts and the running time is somewhere around….all day. The controls system is a 7channel “ACE Nautical Commander.” I believe I am up to the challenge of designing a working 3 point hydrodynamic lift vehicle. Any information that you could forward to me would be greatly appreciated. — Aimee Eng (

More…[29 May 99] Over the last two years there has been a boat on the Columbia River in Portland Oregon that looks like one of the PHM or PHC class hydrofoils; it has the single stack behind the superstructure. I haven’t been able to determine who owns it. As of today I’m not sure if it is still there. I realize that the 3pt fully submerged foils present a control problem but I believe that the RC helicopter gyroscopes should be able to help compensate this difficult configuration. I doubt however that I will be able to feed air over the foil and that foil control may have to be done via ailerons. I feel that the most difficult piece of modeling the phm series is the power plant. The Canadian BRAS d’OR at least had propellers, if I remember correctly. It also had the simpler V- foil configuration. Leave it to me to pick a difficult challenge. This is probably why I have yet to actually begin construction. Not to mention the lack of Hull data. — Aimee Eng (


[30 May 99] We have been making a model submerged foil hydrofoil, and I suggest that there are three important things to consider if you want a model to actually lift.

  1. Lift. The foil lift is the dynamic pressure times the foil area times the lift coefficient. The dynamic pressure is half the density of water times the velocity squared. The lift coefficient is up to about 1 and depends on the angle of attack but 1 is a reasonable maximum. If you use metric units of m/s, kg/m3 etc there are no conversion factors.
  2. Thrust. You need to overcome hull drag up to the point where the boat lifts. The hull drag is usually much larger than the foil drag, and is approximately proportional to boat weight. The hull drag goes up very rapidly with boat speed, up to planing speed, but that is often about lift speed. If I remember correctly, the PHMs were water jet driven, and water jets will scale very badly, especially at the much lower take-off speeds of a model.
  3. Control. I can send you the circuits that we are using, that are designed to work with model radio servos, if you want. Hydrofoils are unstable in ride height and roll, so you need to control both. It is impossible to do so by hand, because the boat will fall over too fast for you to react in time. Neither control has any input from the radio reciever.

For the ride height you need to be able to change the front foil lift from maximum to zero in about 200 ms, even if the back of the boat is changing height as well. We have a 60 ms FET servo (about $100) controlled by a capacitive height sensor. The sensor is a rigid insulated wire parallel to a strut. The capacitance to ground is dependent on how much is submerged, or the ride height. This is modified by a vertical accelerometer, to prevent the boat jumping out of the water as it reaches take off speed. We need slow control and fast control. Slow control holds the height correct but fast control keeps the vertical speed low at take-off or over waves. For roll control, the servo must be able to increase the lift on one side and reduce on the other enough to hold about a 20ø roll. It also has to be fast. We have a heading-hold gyroscope from a model helicopter, with its sensitive axis along the boat, and the gyroscope input comes from a lateral accelerometer. Again this is slow and fast control. Slow control keeps the boat from rolling and fast control keeps the roll speed low. — Malin Dixon (


[21 Jun 99] The level sensor that we are using on our RC model hydrofoil is not a finished product that is for sale. I can advise you, but I cannot tell you what will definitely work. The sensor is a capacitive sensor. The wire is insulated, and the capacitance to the water depends on the rod diameter, the immersed length, the thickness of the insulation and the dielectric constant of the insulation. The dielectric constant of water has an effect but it is so much large than the dielectric constant of the insulation is what matters. We have used this to control the angle of the front wing to give ride height control, but on its own it is not enough. It is fine for slow height changes, but fast height changes are a problem. The problems are that the angle of the front wing changes as the rear of the boat lifts, and that the boat can achieve a significant upwards speed while still too low. We have modified the signal from the height sensor with a vertical speed signal derived from an accelerometer. The gains from the height and the vertical speed are separately adjustable, and feed a fast servo motor that controls the angle of the front wing. The system needs to be fast, because the height is unstable and it only takes fractions of a second to achieve a big vertical speed. A model of a PHM will need roll control as well. — Malin Dixon (


[15 Jun 99] It appears that you are looking at two different hydrofoil ships. First off, the PLAINVIEW (AGEH-1) was stored in the mud flats of Astoria for many years. It has an exhaust on the back end of the superstructure. This ship is now moored a few miles upriver, and is owned by a church. The church accepted it as a donation. The ship moored in Astoria now is the HIGH POINT (PCH-1). The owner, Capt. Ronald Fraser’ estate is attempting to sell it. Capt. Fraser’s sister in California is the executor, and his nephew Will is the ship’s caretaker. I personally have not met or talked to Will, but I understand he is willing to show the ship to interested parties. He has very little background on the ship and its present restoration status. HIGH POINT was moved from Portland to Astoria about a year ago to conserve cost of moorage. HIGH POINT has its turbine exhausts on the stern, one on each side and an outdrive in the center of the stern for hullborne operations. If you have any particular questions, I will try to get you the answers. — Sumi Arima (

PT 50 Scale Model Hydrofoil

[16 Sep 99] I’m looking for info about the scale model hydrofoil PT-50, that I have seen on your photo gallery. I’m rebuilding a PT-50 that I got for free when I was 16 years old and knew nothing about hydrofoils. He had built the model to 60% of completion and never got it foilborne. He didn’t have any information or the original box, only the (incomplete) model. I have never got it foilborne either. I’m now 26 and captain on a Voskhod that is in use in Holland by Fast Flying Ferries. If you (or somebody else) have some information about the PT-50 model, please help. I also want to be a member of the IHS. — Mark van Rijzen (

Response…[16 Sep 99] I was delighted to hear from a working hydrofoil captain, and to receive your photos. Of course we want you to participate as a valued member of the IHS. Information about how to join can be found on the IHS website. If you have any questions after reading the information on that page, I will be glad to answer them for you. We have no info about the radio controlled scale model that appears in our photo gallery… this photo is from the EBay auction site; I never actually saw the kit. As for the real thing, the best source of details would be an old copy of Jane’s Surface Skimmers — Hydrofoils and Hovercraft. This may be available at a library locally. PT-50 was a 63-ton passenger hydrofoil ferry designed by Supramar for offshore and inter-island services. The prototype was completed early in 1958. By 1973 there were more than thirty operating regular passenger services in areas ranging from the Baltic and Mediterranean to the Japanese Inland Sea. We have only one photo on our website, located at Your scale model is named CONDOR 5. I believe that the CONDOR series was built by Hitachi Zosen and operated by Setonakai Kisen. I believe that some of the Condors are in operation today, but I do not know about the CONDOR 5 specifically. — Barney C. Black (Please use the BBS to reply)

Follow up message…

[16 Oct 99] I was glad to receive a e-mail of the IHS,and one from Malin Dixon (he put my picture on the IHS website photo gallery). I discovered some information about the Condor Ferries and the PT-50. Condor Ferries still exist, but they have no more hydrofoils. They have pictures of the fleet on their website. The website of Rodriquez Cantieri Navali has photos; they built 20 PT-50s, but none of them was built for Condor. They built only three Condor vessels: Condor 4 an RHS 140 delivered in 1974; Condor 5 an RHS 160 delivered in 1976; and Condor 7 an RHS 160F delivered in 1985. Although there was no PT-50 built as Condor 5, I named my model PT-50 “Condor 5” because at that time I had one picture and one postcard of a hydrofoil… Right! the Condor 5, which I now know is an RHS 160, not a PT-50. — Mark van Rijzen (

RC Hydrofoil With Automatic Control System (ACS)

[19 Sep 98] We have managed to get a model radio controlled hydrofoil working. I think that it is the smallest fully submerged hydrofoil ever, but that’s only because I’ve never heard of a smaller one. Here is a brief description, and the website is: The boat took a long time to develop. What we ended up with was something like this. This is from memory, so there might be small errors. Motor and drive: Model car motor, about 11 turns, driven from 8 C-cell NiCd batteries and electronic speed controller. 6:1 gearbox and 55 mm pitch propellor, 32 mm diameter. Gives about skeg thrust when stationary. Hull is from a model planing craft, but the total weight is now 3.8 kg. Wings are made from the front wing of a Trampofoil A1 cut into several pieces. Span is about 250 mm and chord about 60 mm both ends. Take off speed is about 1.5m/s. Top speed is much faster, but we haven’t measured it yet. Controls: Standard radio control gear controls motor power and rudder. Rudder is on trailing edge of front strut and is not very responsive. Turning radius is several meters. All that is the easy part. Here is the difficult part: The boat is unstable in height and roll, so control systems have been fitted for both of those. Height: Capacitive level sensor fitted in front of front strut measures ride height and controls angle of attack of the whole front wing. High speed servo motor (100 ms) is used. There is no driver input. We still have some problems. What we think is happening is that as the rear takes off, this causes the front angle of attack to fall, and the height control system is too slow or has too little gain to stop the front falling. When the front is low, it starts to rise, but when the front is low, the rear is pointing down (it has a fixed angle to the boat), so the rear falls just as the front rises, and the cycle starts again. Roll: The rear wing is in 3 parts, separated by the rear struts. The middle part is fixed, and the two outer parts, about 70 mm of span each side, move in opposition for foil control. A pendulum angle sensor is used for slow roll control, with a gyroscope for fast roll control. These control a fast servo motor which moves the outer wing parts. There is also an input from the rudder, to alter the angle as a turn is started. This seems to work well, but there were a lot of bits to get working. The boat is not very difficult to drive. Without the control systems it would be impossible. The battery life is about 5 minutes. — Malin Dixon (

Tethered Hydrofoil Project Remembered Partially

[22 Mar 98] When I was a kid (I’m 32 now) I remember flipping through a pile of Popular .* mags and found an article on building an .049 sized tethered hydrofoil. There was mention of RC, so I’m guessing it was circa early 70s. Any info greatly appreciated as hard searches have yielded nothing. — g. (

Response…[23 Mar 98] If you manage to locate a comprehensive index of Popular Mechanics articles going way back, whether by looking in your main library or contacting the magazine, I would like to know about it. I get a lot of inquiries about old articles in the magazine and would like to know where to send the inquirers to find an answer. I wish Popular Mechanics would do as National Geographic has recently done and put all their back issues onto a CD-ROM collection. You might want to visit IHS member Ken Cook’s website at web page: His company offers several radio controlled racing hydrofoil models. If you decide you want one of his kits, it would pay you to join IHS before buying, as he offers a good discount to IHS members! Finally, if you know the specific magazine and date of issue that you want, you can search for it on the internet auction sites, particularly Ebay. — Barney C. Black (Please use the BBS to reply)

Update to Previous Response…

[2 Sep 00] Note that Hydrofoils, Inc. is no longer manufacturing or supporting R/C Models. They are devoting their efforts to design and sale of full-size vessels. Suggest you visit our links page for several sources of hydrofoil models. – Barney C. Black (Please use the BBS to reply)

Hydroplane Model Sought

[20 Mar 98] Do you have any information which would be helpful for building a 24″ model of a hydroplane for racing purposes? I’ve been racing hydroplanes in competition for several years, and hold several records, but the yearn for speed has me looking to foils. — Andy Kunz (

Wants to Add Foils to Victor Products Kit

[16 Oct 97] I am interested in obtaining any technical drawings or pictures, that might aid me in the design and installation of hydrofoils on my Victor Model Products “Wildcat” Radio Controlled Catamaran. Any suggestions as to which type of foil (ladder or single) to use would be greatly appreciated. I would like to start this project soon, so I can test the boat in the early spring. — Tracy L. St. Phillips (

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