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by PrfctChaos
Mon Oct 19, 2020 12:28 am
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3578

Re: Wing profile info for backyard hydrofoil builders

If it was only $50 I would be all in, but I don't have any pump to actually make the vacuum so unless there is some workaround I'll need to stick to handcrafting... Hand layup should be fine. But would be easier to get 200 g.m^2 fibreglass to conform than carbon fibre. For Fibreglass I would probab...
by PrfctChaos
Sun Oct 18, 2020 9:43 am
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3578

Re: Wing profile info for backyard hydrofoil builders

For 200g/m^2 carbon fibre thickennes are usually given at around 0.2-0.28 mm / ply. So 1-1.5mm for 5 layers, but check details for the specific cloth you are buying. Might turn out a bit thicker if hand laminating (i would probably suggest fibreglass instead of carbon fibre if hand laminating in any...
by PrfctChaos
Sun Oct 18, 2020 6:27 am
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3578

Re: Wing profile info for backyard hydrofoil builders

I wouldn't do random patches. Just 5 layers of plain / twill 200g/m^2 carbon, simple and the job is done. Undersize core accordingly. Smooth surfaces are 100% the most important thing and patches are a pain for getting smooth afterwards.
by PrfctChaos
Sun Oct 18, 2020 3:34 am
Forum: Hydrofoil
Topic: Moses Bolt Torque?
Replies: 34
Views: 1574

Re: Moses Bolt Torque?

The first of 2 mast-to-fuselage-screws untightens itself every session, no matter how tight I screwed it. This never seemed to be a problem to me. The whole connection seems to be very stiff. If you tighten up too hard you hear a nasty creak sound, and this sounds so wrong The 6mm bolts are stainle...
by PrfctChaos
Sat Oct 17, 2020 11:59 pm
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3578

Re: Wing profile info for backyard hydrofoil builders

Okay... So this is the result of few hours in Fusion360. I might have gone a little too ambitious with the front profile - I copied it from online pictures of Slingshot Infinity 76 wing but I think the final product will need to be simplified. Other than that I think that's a beauty! This is SG6041...
by PrfctChaos
Sat Oct 17, 2020 11:46 pm
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3578

Re: Wing profile info for backyard hydrofoil builders

Oh beautiful! Yeah, I think I'll go with the thicker option so SG6041. Is the front wing at 0° AoA relative to the fuselage? I know that stab is usually at negative 1-3° but I'm not sure about the front wing. I was thinking about printing the mould but I'm a bit worried this will be more difficult ...
by PrfctChaos
Fri Oct 16, 2020 11:36 pm
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3578

Re: Wing profile info for backyard hydrofoil builders

HI PrfctChaos. I increased the wingspan and the chord a little, but it was just because I was still taking the technique of modeling the profiles, but I will return to the initial size predicted. I intend to design the td set. But it's still at the beginning. I do not want to give you trouble, but ...
by PrfctChaos
Fri Oct 16, 2020 9:22 am
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3578

Re: Wing profile info for backyard hydrofoil builders

Eric Hi Eric, If you are increasing wingspan or chord by a lot, then let us know the final wingspan and chord size you settle on and I'll rerun the profile selection to check best option for that size. The models are looking good. Are you planning on making the mast and fuse as well? Cheers HI Prfc...
by PrfctChaos
Fri Oct 16, 2020 8:44 am
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3578

Re: Wing profile info for backyard hydrofoil builders

And also noticed that the areas of 1045 cm^2 and 1210 cm^2 came up tied in the results. So here are the results for 1210 cm^2 option. It needs a s2055 profile, that profile is a bit thinner (around 8% max thickness), so the longer centre chord of 205 mm and thinner profile sort of balance out and gi...
by PrfctChaos
Fri Oct 16, 2020 6:15 am
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3578

Re: Wing profile info for backyard hydrofoil builders

Hi PrfctChaos, I'll be attempting to 3D print a front wing and then laminate it with fibreglass/epoxy. I've read the whole topic and I've done tons of other research over the past 2 days. (two days ago I've had literally zero idea about any of this but I'm making good progress, I'm really trying to...

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