HYDROFOIL -- ASTONISHING !!! 24 mph on 2 hp can save the planet! Vellinga Video

[@AlbertRobinson-v3y]

Love your work !! As soon as this last project is finished I'm starting on my hydrofoil..

[@WereAllThatBored]

Man this is the best video yet! Looking to produce +10 mph from a trolling motor. Inspirational at best!

[@normandunnaganjr.5034]

Thanks for your contribution to evolution. Been awed by this since I found out about it. Respect

[@gerhardkutt1748]

Brilliant as usual Ray. Thanks for posting.

[@SkypowerwithKarl]

I have a 10 ft RIB with a 20hp SuzukiEFI that does 31MPH. I thought I was haulin till I saw this video. 24 mph with 2 hp is totally awesome. And it looks a lot smoother riding in choppy water than my RIB. I bet a small hydraulic damper linked to the follower would keep the hull from diving when crossing a big wake. I think it over compensated or reacts to quick to the surface deviations. I wonder what a 12' aluminum boat would do with a 20 HP motor and optimum hydrofoil and prop? 45-50MPH? Makes me want to try.

[@jakim1427]

Where can I buy one of these? Cost? Or where can I buy the hydrofoils?

[@westcoastpetr]

Hello, Ray. I bought your book, and am fascinated by foiling. I have a 26’ express cruiser, and am thinking of adding foils to provide enough lift to improve fuel economy (I use it a lot), and stabilize pitching. I boat on Lake Ontario, which has very wavy waters, often around 2 feet, and this makes boating very bouncy. The spacing of the waves creates a lot of pitching on plane - about 38-44 km/hr. My thought was to add a noise foil to stabilize the bow so it doesn’t constantly fall into the trough, and scrub a lot of speed. Then add two rear foils to provide some lift at the rear. My boat weighs about 7000# loaded, and don’t need to lift it completely out of the water - just create about 1000# of lift to lighten, reducing some drag and keep the bow high and stable. Just wondering if you think this is a feasible approach to foiling? It would add many hours of boating pleasure in this turbulent lake. Also, I would consider hiring you to assist with the design, to avoid any pitfalls as I understand this is a pioneering approach. Please advise if you have a minute. Thank you. [e-mail], if you would like to reach out to me.

[@therealfearsome]

thanks Ray

[@CarlH1955]

Thanks for sharing this video. Amazing boat! I have ordered your book in the hope of some day building something like this. My idea is to use a 2-3 kW electric motor and a custom made integrated driveshaft/foil leg, though. -What do you think about this idea?

[@rvell7829]

+Carl Hyllander Take a look at the Torqeedo Travel 1003 - 28 inch long shaft, Carl. It compares to a 3 hp gas engine and weighs only 21lbs including battery. With the optional high speed propeller V30 there is a claim that it will go 14 knots (subject to verification). Lash it onto a 35 lb West Marine Saba 9.5 sit inside kayak, skillfully attach Moth struts and foils, and you might have something. I'm just suggesting some ideas. Do some research on these components before you start filling up your garage. For example, will the kayak (not a classic planning shape) go fast enough for the foils to lift the hull (Vto)? Are the Moth foils proportioned appropriately, and of the correct area? It would be no fun if you had all the answers without doing some calcs. Good luck, Ray

[@CarlH1955]

+Ray Vellinga Thanks a lot, Ray. This seems like an excellent idea.

[@powerskurf]

Fantastic thanks for posting !

[@Rico-Suave_]

thank you very much, very informative

[@mike_oe]

Very nice. I understand pitch stability / control, but how is roll stability achieved? Dihedral in the foils?? Looks very pole-walking like to me...

[@Traqr]

mike o Bingo! In order to allow leaning into turns (which keeps forces normal to the hull & allows several weight reductions) it's not self-stabilizing. You can see him working to keep the craft up at several points in the video; it reminds me of trying to balance a fast folding scooter.

[@RubenKelevra]

On computer controlled foils it's controlled by turning the left wing up and the right wing down and the other way around. :) On this system it's just controlled by turning the ship left and right or leaning. Like a motorcycle is controlled in roll. :)

[@neekniggit3606]

What are the differences between this type of hydrofoil and a surf board with a hydrofoil that can get the system in the air using just a paddle or with the rider pumping there legs up and down as though they are jumping without their feet leaving the surface of the board? I am looking to hydrofoil my sea kayak and once up launching a power kite to propel myself through the ocean.

[@ChristoCJ03]

nice, thanks

[@DinoAlberini]

Awesome video, no basic questions unanswered, even the long shaft is in the comments below, big like!

[@erikfri]

amazing efishency!! super cool!! what happens if while sailing a foil hits a fi shing net?

[@yoichitakahashi1783]

Wonderful!

[@francisosorio7995]

Can you design a flying samurai to sit 5 people including pilot?

[@andysuryadi4229]

Awesome

[@itsokswallow]

Can we buy the plans

[@zanebridgers4752]

This is awesome Ray! Really an amazing accomplishment. Tom Lang turned me onto this - and I'm glad he did! Question: Does the outboard have a foil on it? Or is it just operating on the front foil and outboard thrust after main foil retraction?

[@dejayrezme8617]

What I'm most curious about is if they are more or less energy efficient for a given speed compared to planing or displacement. I haven't found anything about the power needed to create this lift. E.g. the forward thrust force needed to create the lift at a given speed (P = F * v). Assuming you have the power to make a boat fly, at what displacement or length is this more or less efficient? I've ordered the mentioned book but can't wait haha. I figure if the foil could be made large enough to lift a solar powered boat it would make travel via solar power alone more viable (faster than displacement with solar power alone) I mean this 2hp could be replaced by a small torqeedo motor and you could put a solar panel as a roof to recharge for free. Why don't we see more boats like this? Even more complex computer controlled T hydrofoils should be relatively easy, and if there is an efficiency bump shouldn't that make it worth it? I figure with 4 computer controlled T foils you could also use a kite on a larger boat to make use of solar and wind. Kites are cheaper and don't throw shades on the solar. A computer could control the kite and the foils to keep the boat perfectly level. PS: Oh lol I didn't realize you were the actual author of the book :) It came highly recommended.

[@randomdude1786]

"for you techies" outriggers with retractable hydro foils for stability but ya I love it

[@htm3sun]

Compliments for the nice movies. Like it. I will try to design for my sailboat. Under or on the keel a hydrofoil to make it a little bit lighter to make more speed on windpower. Just for fun, and thinking on nature advantages. Anyhow, check all the movies, use the theory, invent a little and give it a swing. I am Dutch. Greetings Hans

[@erikfri]

amazing efishency!! super cool!! what happens if while sailing a foil hits a fishing net?

[@HenryLSilviaHenrylSilvia]

Stops suddenly😁

[@jonathantrekallover9369]

erikfri sharpen the the foils and you’ll cut through anything

[@250tegra]

Fishing net? Much like any keelboat/outboard/prop-drive/whatever - it depends on how the hardware is shaped. On passage to the Canaries in the 1990s. we popped into Portugal, somewhere up a wide river estuary. Near the top of tide, so we took the short route, but noticed that the two local boats in sight were on the other side. Nothing remarkable in that. Then we came across a small monohull cruiser with his keel entangled in nets - we had slipped over them with our deep vee hulls with LAR keels and had not noticed them. There were no visible markers or buoys, because they had submerged at high tide. Even props can have skegs that need not add excessive drag, too. It's all in the design.

[@bergssprangare]

Amazing..saving the universe

[@patrikhafstrom8954]

I thought speed on water was measured in knots !?

[@yahwehsonren]

Interesting

[@lucywucyyy]

man thats fast

[@bobjohnson2570]

yes...your book.....I need pdf book or kindle book NOW.....not paper book later....

[@rpp9961]

2 HP ? yes but 2 HP Yamaha ...!!!

[@MakerFabio]

if you change thumbnail you will have 1Million views

[@bobjohnson2570]

24 mph on 2 hp OMG

[@RubenKelevra]

This is lacking a computer controlled stabilization - for longer trips this level of attention would be very exhausting. But still very impressive.

[@heavyweather]

Ruben Kelevra Can be added cheaply. Arduino, sensor and some servos.

[@RubenKelevra]

Marcus interesting, which sensor would you recommend for the movement detection and angle detection?

[@dejayrezme8617]

You'd get a accelerator, gyro etc to sense the angle and orientation of the craft. These are used in phones are are very very cheap by now. They also don't need to sense anything "outside", they just measure acceleration, rotation and gravity.

[@Andysfishing]

It looks like Mr Kanai could! Ha ha

[@woodyahh2110]

Did he buy your book that you don't want to sale😀

[@waynegilham5362]

OK but who developed such an extra-extra-extra-extra long shaft 2hp outboard? (powerhead looks "stock"...) and who has developed a prop for such a tiny outboard with pitch to reach 24 mph? -- then I see WHO is the developer - yep, a Yamaha staffer! fo course, he has the full support of Yamaha R&D... but still, where canh I get such a neat outboard?? (consider a racing class.... affordable, no?)

[@rvell7829]

+Wayne Gilham Yes Wayne, the team is all from Yamaha, but I believe they are working this project independently of the Corporation. The techniques for shaft extension are well know to them, especially to Kotaro, because they have designed or made extra long shafts for the YZ886, OR51, and OU90 (see the last minute of the video). You of course are an expert in sailboats, so I ask you, aren't there extra long shafts on "kicker motors" for small cruising sailboats? The propellers can be custom made at places like Pacific Marine Propellers, Chula Vista, Ca 619-239-0129. To custom make shaft extensions is difficult, but can be done with the help of a machine shop to cut splines on a new shaft, and an aluminum welder to assemble new end plates and custom long bodies for the mid unit. The trick Kotaro's team does that really impresses me is attaching the main foil to the motor skeg. It looks like they simply weld it on, but I have never asked kotaro if there is a secret. Ray

[@peterkay7458]

I was asked to design a lower end transmission for an efoil and believe me it is a super precision engineering work of art.....not impossible to duplicate but certainly non trivial.

[@walkertongdee]

Man as we know him has been around 70,000 - 1000,000 years Ray, if you are religious lots less...

[@normandunnaganjr.5034]

I guess I’ll need some fat boy sized foils.

[@jasonalpinevillage]

Brilliant! But wtf is with that piano music.

[@nicholas2932]

lol 120mpg at WOT. thats the fastest most fuel efficient boat ever made.

[@craigthinks]

Save the plant? Maybe when they can put these on cruse ships.

[@jonathantrekallover9369]

Craig Thinks sky sails. Check’em out! Lots of other emerging tech as well. It’s more profit driven than sustainability driven because that’s what matters to capitalists but it’s good for the planet.

[@walkertongdee]

Hey Ray. where can i find some info on hydrofoil assist? I want to raise my sail/motor cat so the hull remains in the water a little bit still retaining control with rudders and hill stability. My idea is to reduce weight and surface tension to gain speed. Is this idea a good one? see kzbin.info/www/bejne/d2fHdXSIotOWqtk Thanks Hey dont forget to have fun!

[@rvell7829]

+Walkertongdee Good question, Walkertongdee. You are asking me about HYSUCATs, HYdrofoil SUpported CATamarans, and some good visual examples can be found at: ihs.phanfare.com/. In the "I" classification. Also do a google search for HYSUCAT and HYSUCAT foils, and you will find a lot more. I love the Thailand long boats, and there should be no reason hydrofoils would not work on your excellent catamaran. However, you will see a pattern of using the hydrofoil assist on heavier catamarans. Yours is light, draws little and appears to very efficient, so you might have less to gain. But the HYSUCAT system is simple and could easily be tried on your small boat. Let us know how it works for you.

[@walkertongdee]

Well yes, but as of yet I haven't proceeded, not enough info there and I did not buy your book like you told me not to, he,he. Seriously though can you point me somewhere? Thanks.

[@rvell7829]

+Walkertongdee Yes, seriously, Walkertongdee. Beg, borrow, or steal a copy of Hydrofoils: Design, Build, Fly and read it. This will give you a good understanding about the principles of hydrofoils along with much practical information. From there you can adapt foils to your catamaran. For specific questions, post them on the foils.org Chat board: www.bulletinboards.com/message.cfm?comcode=foils, Either I or Scott Smith or someone should have an answer for you and we can all share the discussion with the hydrofoil world. Ray

[@LessBoringTutorials]

a horse goes 24 mph on 1 horse power

[@dansw0rkshop]

Across the water?

[@zzzxxzzz4797]

Until you hit a fish

[@250tegra]

MMMMmmm . . . . . . Sushi!