What HP motor is that? It may be too small.
5 hp, i can make Some speed. Is it possible that the angle of the stabilizer is too large ?
Ca you share a video trying to fly?
Yes for sure
Move more your body position forward and go full throttle to get on a bit of a plane then shift back slightly when at speed, Looks like it wants to come out of the water but you’re to far back on the board
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You need to keep constant speed, and keep your body forward, board should be planing flat on the water, then you can start to play.
When i try to get the front down i’m reducing speed
You’re stalling the wing. That means lots of drag and no lift. As the others said, you have to gain speed before lifting the front.
If keeping the nose down doesnt work and your motor really has 5hp, then the issue(s) might be:
- Your board is really bad at planning
2.the pitch of your prop + rpm combo is too low , that is, it is designed to provide thrust at low speed and will not be able to reach enough speed - Perhaps the “fuselage” has too much drag?
Yes i understand that I think that i have to change the angle of attack of the stabilizer.
I think it want to take off to soon
Thank you for your explanation. I also think stalling is the problem here.
I assume when foil is working correct to will win speed by pushing the front down.
I lose too much energie this way. but not sure if this is caused by the angle of attack of the frontwing?
Or stabilizer? I will readjust the stabilizer and see what happens.
At the begining you want your board (and hence wing) to be as flat as possible to gain speed. Then very slowly increase the angle of the board so that the wing starts generating lift. The speed should start increasing as the lift kicks in, thus raising and reducing the drag of the board. Eventually you should be out of the water, if the wing did not stall.
The guys from foildrive have a nice video explaining this (in YouTube)
You can try changing the AoA of the stab, but imo the moment you can generate shifting your weight is much higher than the one of the stab.
On the video it seems to me that you’ve got enough power and speed to get up.
Your wing installation angle seems to be quite large and that together with the nose lift when you power up makes the wing stall. If the angle of the wing is too high already in installed position then it needs to be changed… i think you will be able to judge this when you’ve gotten up a few times, if stall is happening when board is only a little from horisontal then it will never fly well.
As all the others pointed out, you really need to keep the board horisontal and let the speed increase before shifting weight rear enough to start lifting.
Good luck!
Thank you for your input I know now that it is really important to get the speed up first when board is horizontal. the stabilizer and angle of attack are quite big, i think this is the reason it want to lift the front so soon. when this happens the frontwing works like a brake…I will change the angle of attack of the stabilizer
With certainty… That motor is too small. Show us your controller and battery. You need about 3000W to foil at about 200lb All out weight.
Controller?. Battery? It is gas (as in petrol) powered!
I’m an idiot… Although the missed detail was small.
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New possible reason for lack of flight then… Increase the pitch of your prop if possible. Hopefully your motor has some headroom for torque and you will gain extra velocity which will help you avoid stalling and get flying.
Hmmm, where to start. There’s no way to get the precise power control you need with a gas motor, it looks like you’re setting the output once and then trying to foil. we use wireless controllers for a reason–more power to get up on foil, and then drop back to maintain, unless you’re going for max speed. Is this supposed to be a board you stand on or a boat? The front wing looks like an old Gofoil M200 or maybe something smaller like a Kai, very draggy, low aspect, thick foil. Could be made to work but everything else would need to be just right and clearly it’s not. If you’re going to use GoFoil you’d be better off with a 280 which at least has lots of lift to go with all that drag, but there are better choices. The stabilizer looks ridiculous. The picture isn’t clear enough to tell, but it doesn’t look like a foil section at all. That’s not how stabilizers work–they aren’t arrow feathers, they are better described as rear wings. The angle between the stabilizer and the wing needs to be about +3 degrees. Your fuselage is crazy long. You’d be better off not completely reinventing foiling and going with something that has already been developed, like a complete Gofoil wing, fuselage, and stabilizer. The older Gofoil setups can be had dirt cheap, most folks have moved on past the old Kai, Maliko, M280, the 24" mast and the angled stabilizers so you can get them fairly cheap. You more or less need to know how to foil before you start using an efoil, at least get dragged behind a boat with a conventional foil and board and get the basics down. The board looks hideous, I can see you put a lot of effort into it, A+ for effort, F for execution–it’s more or less all wrong. Any swell hitting those slab sides is going to shove you all over. You’d really be a few steps closer to success with an existing foil board, or at least taking your building cues from stuff that already works. Don’t think I’m just being hard on you, I’ve made the same mistakes only worse. I tried to reinvent how foiling works to suit me. Bad idea. I made a lot more progress by taking advantage of all the effort that other people made to get this sport working.
i have good news! I changed the angle of attack of the stabilizer and now i can make much better
speed without lifting the front! At certain speed it start to foil! i have no video yet. will make some improvements to the board first. Then i can learn to foil!
Thank you all for the tips!
thank you also for your input. i have my doubts about the first point you mentioned.
I think the power control of the gas engine is smoother than a e-motor so no issue expected at this point.
The +3 degrees of the stabilizer is very good point! Before i had too much angle resulting in stall!
The rest of the board we can discuss:) But i agree it is quite unique.
Not sure if anyone tried before around the world, but never seen it.
For sure i understand that it will be easier to buy one.
For me it is a nice way to learn more about foiling.
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