TomW,
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.
Design objectives
- 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.
Top view
- 2017-06-09 12_22_49-Dr. Hanley's MSA - 3DFoil (8-Surfaces).png (11.19 KiB) Viewed 2399 times
Surface stats
- 2017-06-09 12_24_58-Dr. Hanley's MSA - 3DFoil (8-Surfaces).png (21.54 KiB) Viewed 2399 times
Coefficients for the system
- 2017-06-09 12_28_45-Dr. Hanley's MSA - 3DFoil (8-Surfaces).png (17.21 KiB) Viewed 2399 times
Stability (longitudinal): neutral point is about 15 cm from the front, right where the mast should be.
- 2017-06-09 12_29_59-Dr. Hanley's MSA - 3DFoil (8-Surfaces).png (16.09 KiB) Viewed 2399 times