RC Hydrofoil Flies Over the Water

This project was sick, really enjoyed making it. Leave a comment suggesting what I should do with his thing in the future, or any other things you'd like to see me create.

[@LimabeanStudios]

Great video, love the simple goals and execution of it. Its so cool to see those foils slicing JUST under the surface

[@hamburgerinc6995]

Thanks bro

[@pmgear]

I enjoyed the build, but also the funky music, great combo for a nerd like me

[@danacarvey]

This is awesome and exactly what I wanted to build after seeing the RCTestfilight version. Nice job! Will you share the print files? 3mf files maybe?

[@GrandadIsAnOldMan]

That is really impressive, You met your targets, cheap, simple, and it worked amazingly well 👍👍

[@Caroline_Tyler]

Angle your motor down to move the thrust line close to the nose - this will help to reduce the pitching over when you add power. It's what is done for airplanes that have a top mounted prop. Nice project!!!

[@hamburgerinc6995]

that makes a lot of sense. thanks for the feedback!

[@Del350K4]

Mmm...cool intersecting ripples @ 3:00

[@MichaelRainabbaRichardson]

Smooth music for a smooth machine 😊

[@ChainsawFPV]

Very cool. I have been on a Sail GP "kick" lately. Those AC40/75 are amazing pieces of technology.

[@paulmoffett8707]

Extend the rudder control upwards to direct the airflow from the fan. I think it may improve handling at speed less good at tight corners. Great project.

[@robertbackhaus8911]

I'd like to see how thin the hydrofoils could be made. These large hydrofoils mean that the angle of attack is very small. A thinner foil with a reasonable angle of attack could allow the boat to lean into turns. Sweeping the foils backward would also help this.

[@hamburgerinc6995]

True, that is a great idea that I would love to test in the future perhaps, and see what kind of performance increases can be made. Thanks for the suggestion!

[@brazenh2836]

Only thing I'd change is making the rudder a small hinged piece at the back of the rear foil. (rear foil should be rigid) That way you'll have less proportional steering (low speed tight turn, high speed wide turn) but the vessel won't drop every time you turn, interrupting the rear foil attack angle...

[@waltonchan3931]

Trying to scale it up while keeping it simple would be a cool project!

[@Rebar77_real]

I immediately want to make a full size version! Love the design. Maybe a little H-bridge on a CD drive stepper to adjust your worm's trims on the fly? Plus a third trim on the rudder, etc. Then you could think about trim vs speed and maybe leaning into turns. Also, I wonder how small the front foils can get and if you could turn them inbound without needing to stagger them. :D

[@hamburgerinc6995]

All good ideas! if I ever further the design, these are things I would incorporate. Thanks for the suggestions

[@RegisMichelLeclerc]

I'd love to make the "full size" version too... Except that power and weight don't scale up too well, even if you stay at the size of a single seat on a platform: you need to scale the propeller, therefore the engine, which becomes too heavy for the platform (even with a big motorbike engine), which means rescaling the foils (which change lift and drag characteristics), change the propeller again, the engine... Believe me, the recursion quickly becomes a nightmare even before you start! It's all about the torque your engine is able to provide and the weight it takes doing that, not yet counting weight of the fuel and the pilot... That's where you start considering a "lifting" fuselage in fiberglass... Did anyone say "money"?

[@Makerizms]

This is epic honestly, and the way the hydrofoils cut through the water just perfect!!!

[@fjg11]

Very impressive, congratulations

[@hamburgerinc6995]

Thanks!

[@Visiorary]

I'm loving it!

[@colincharles8737]

Love it, you've got me thinking, can i make one. The motor could be incorporated into the rear foil , underwater. I like the foam hull idea its quick to make, light, and adaptable

[@myblueocean2]

You could add a step into the boat to break the water adhesion better. Great project.

[@TheFlyingChad]

That is so awesome! Great job!

[@hamburgerinc6995]

thanks!

[@Jrok338]

Well done!

[@rthefish]

An Autonomous mission sounds perfect.

[@juanarias3560]

It would be nice to install some FPV gear as it sails so smoothly. Very nice work! For your next project you should build on big enough to carry a person ! lol

[@Okamika44]

Do you have links to the STl files? awesome video!

[@dennismatovich8411]

Great project! First thing I thought was this would be great as a recovery boat.

[@hamburgerinc6995]

That would be a great application for it!

[@lesliesavage9229]

Great job.

[@segment932]

Awesome project. What about giving the trailing foil the same shape as the forward foils so that it has the same height adjusting feature? That would perhaps help the nose dives when going down in to the water.

[@hamburgerinc6995]

good idea, that might work better

[@meldert]

With more channels on the radio you could make the foils adjusted by servos too, and mixing that with the throttle so that you hav optimum angle at different speeds.

[@hamburgerinc6995]

Brilliant idea!

[@scratchbuilder101]

AWESOME!!! Would you be willing to sell a set of the stl files? At 61, I'm too old to learn cad, but I do have a Max Neo I like playing around with. Thanks.

[@hamburgerinc6995]

I genuinely never expected anyone to want to buy the parts for this thing. The foils, rudder mechanism, and whatever else aren't the most refined in their design, so I'd be willing to give them to you for free. Just be aware that you might need to scale down the foils and other components so that they can fit on your printer. You can shoot me an Email at, [e-mail] , and remind me of your interest for the CAD files, and I'll send them back to you👍

[@GoennhardtGibdirVonChillingen]

Thats a pretty neat and simple design. I was wondering, if you changed the rudder foils to be similar to the ones on the front, would it become more stable at high speeds? Because it seems to me, that the static lift from the rear foils pushes the nose down at higher speeds as the front foils lift further out of the water

[@hamburgerinc6995]

In theory, it could help. Good idea

[@annoorusa]

Cool project would it be possible to uploaud the files i would really want to make this

[@ReignFPV]

Very cool Build! it would be sick if you tried to make it into a speed boat just with foils.

[@RegisMichelLeclerc]

Nice job! The next stage is a Lippisch-style Wing-in-Ground vehicle using hydrofoils to reduce the drag of the water and reach take-off speed. I'm curious to see what your back foil looks like, though, you're not showing it to much. I'm also curious to see what happens if you turn the "winglets" (may I say "foil-lets"?) downwards and direct the drag inwards (i.e. towards the central back foil)?

[@hamburgerinc6995]

The rear foil it shaped like an upside down T. Also, it would be interesting to see how the boat would react by changing the orientation of the main foils inwards. Good suggestion

[@andreyl2705]

awesome)

[@stephenb4823]

STL?

[@TahoeMtnMan]

Love it! Have you considered putting a servo on each forward foil to adjust the pitch angle with acceleration?

[@hamburgerinc6995]

This was one of the things I considered doing, but just didn't have the time or money for 😂 but good idea

[@mino73T11]

What to do with this thing? Make it bigger and ride it! 😉 If foils become too big for a 3D printer, just increase the number, not only the size. And, judging by the efficiency of the foils, why not pedal powered?

[@herwigg3327]

Well done, how does it perform in waves? You always got perfect smooth water conditions.

[@hamburgerinc6995]

In all honesty, it was a coincidence that the days it was tested were so calm. I would imagine the boat could self stabilize through small chop, but that it would have a difficult time functioning in larger swell.

[@golfish8589]

Any thoughts on my 20 year old idea of putting hydrofoil on canoes? Human powered and electric motor powered?

[@hamburgerinc6995]

Sounds tricky, but if you have the will power to achieve it, go for it

[@mikasjoman]

So when are you gonna scale this up so you can sit on it? You just need a Flipskys 65165 motor, 12S battery pack and off you go ;)

[@hamburgerinc6995]

In a world where I had the funds, I'd definitely give that a try

[@carbonarne675]

Let's see if I get my AC 75 to work

[@ericholder2026]

Upscale it to fit a human pilot !!

[@ck2503]

What hot glue are you using? Seems super strong.

[@hamburgerinc6995]

It is from the Gorilla Glue brand, and you're right, it's the best one I've ever owned

[@Brocknoviatch]

How would this go in 30cm choppy water? Would love to give this build a go, but the lake I use rarely has water like in your video.

[@hamburgerinc6995]

No idea to be honest, the days where I tested it in this video was coincidently very calm. I would assume it could handle small chop but nothing as big as 30cm unfortunately.

[@kevinwelsh7490]

please publish a design that will carry 100 kg pilot

[@donaldstraitiff7827]

ducted fan?

[@hamburgerinc6995]

if only I had the money😂

[@donaldstraitiff7827]

@hamburgerinc6995 you could 3D print one and run it off an electric motor like a prop. Theoretically you could even duct the prop for higher efficiency. Really the magic is in the ducting.

[@donaldstraitiff7827]

@@hamburgerinc6995 I mean, the stipa-caproni worked

[@UnitSe7en]

Already wrong at 0:41. That's planing. not foiling. You built a hydroplane.

[@ChristianNally]

This is a great comment but leaves out that it’s an easy one to test by simply adding more weight. If this design foils but then turns into a stable hydroplane at high speeds, that’s not a bad thing.

[@ChristianNally]

On second thought, it’s clear that it wouldn’t get into hydroplaning mode if it didn’t foil first.

[@ChristianNally]

The only question is this: during the foiling phase, was the flow laminar?

[@UnitSe7en]

@@ChristianNally Weight is not the answer. I don't think you really know what you're talking about. And no, planing is fine. But he thinks he built a foil, and the title says it's a foil, and he thinks he's foiling, and it's not and he's not. Someone has to tell him because he clearly doesn't know the difference, that's all. If he goes around showing this off as a hydrofoil, people are rightly going to tell him he's wrong - And probably an idiot.

[@ChristianNally]

@UnitSe7ev Is it planing if most of the lift surface stays under water? I say no. You're free to argue. Ultimately it comes down to whether there is laminar flow. In air, a stalled wing isn't call a hydroplane. It still has lift (just way more drag). Increasing the weight means we get to see how much lift it has while it's submerged and whether it finds a balance point that's not as high as what you see at 0:41. Let's say it finds a balance point 1/2 way up. Is it hydroplaning then? I say no because the lift surface is all inside the water. If it was pure hydroplaning, then I think the lift/drag dynamic equilibrium wouldn't let it establish a dynamic flight height that was lifting the hulls any at all. So yeah... weight has something to do with whether we can distinguish planing from foiling.

[@TJohnsonLLC]

Fantastic. Build some for the Ukraine. Or build an AC 75 or F 50 variant.

[@x-movieclips]

udda man

[@hamburgerinc6995]

Word😂👍