Here I'll post my attempt at designing a foil. I bought a software that will let me design and simulate a foil (with the stab), so I can design for exactly the speed, lift, and drag that I want. I used a software called 3DFoil ( http://www.hanleyinnovations.com/3dfoil.html
) which does the job. I looked at an existing foil plan (Liquid Force) and tried to copy that.
Disclaimer: I'm not an engineer and can't claim to understand a lot of the technical aspects of this.
Disclaimer 2: I have made these wings, but I have not tried them in the water. So all this is theoretical. With more experience (since I tried this I bought a Moses Fluente foil), I see that this design is prob too high aspect for my liking, probably very fast (assuming you can keep it thin) but also very twitchy longitudinally. Again this is speculation.
- Enough lift at around 7-8kts
- higher aspect in order to decrease drag
- use a known foil profile that people already use
- not overly complicated to print and add CF
At the end it requires about 0.5 hp to go at 15 knots with 250lbs on it. I figure that is very easy for a kite to provide.
Coefficients for the system
Stability (longitudinal): neutral point is about 15 cm from the front, right where the mast should be.