Not bad for your first prototype! Your next prototype will be much better. Here is what I think will help. The heat from welding has annealed (weakened) the aluminum. With aluminum, this is a big change in the strength of the material. If welding aluminum and not heat treating afterword, 5086 is nic...

I found this interesting.

http://www.diy-wood-boat.com/Glue.html

Nice. Would love to see more of the twin tip in action.

Try some 1/8" 7075-T6 aluminum. Should work well and cost less than Ti.

http://www.mcmaster.com/#aluminum-alloy-7075-sheets/

ronnie wrote:The UA4085 louvre aluminium extrusion looks about right for a mast? 94mm chord and 10mm thick.
Australian company.

http://www.ullrich.co.nz/images/louvre_3.jpg

Nice find. Thanks!

I agree. Well done.

This looks interesting.

http://www.rigrite.com/Spars/Kenyon_Spa ... rfoil.html

http://www.rigrite.com/Spars/MetalMast_ ... tions.html

The T dimension is further down the webpage. Yes, it looks to have too much drag, but maybe they could offer another airfoil for a "reasonable" price?

You are amazing! Thanks for sharing.


I found this interesting.

http://www.offshorespars.com/store/airf ... er-tubing/

Good discussion, but no dog-dodo on anyone, please. Some people find surfboards fun, while others are annoyed by having to jibe them and don't have the time, skill, or patience to learn how to jibe so they use a twin tip. I think the same is true with hydrofoils. Yes, there is a trade-off, but if th...

Good Work!

I suspect the stabilizer wings might be a bit long and disturb flow over the main wing. I suspect a longer fuselage with smaller stabilizer wings would be better. But you will know before me.

Billie, you are a piece of work! (but we all are really) You are repeating what I have already stated. I knew it would not be near as efficient as a directional; but, it is not as efficient as I would like. It needs to get better and I think it has potential... ...I then moved the wings together. Th...