atomic-chomik wrote: ↑
Fri Oct 06, 2017 1:56 am
I have access to kevlar cloth(any one work with it?) and carbon fiber. As well, i have access to vacuum bag setup so all good there.
Carbon fiber is stiffer than kevlar. Also, when kevlar fibers get wet, they begin to lose some of their strength. Probably not a problem since they would be fully encapsulated in resin. The best foils are carbon for a reason. I have heard of kevlar being used from time to time, but it seems like a mistake. I think carbon is definitely better for hydrofoil construction than kevlar.
Anhedral (or is it dihedral, I'm always confused. wingtips curved down) lets you roll a bit further before the wingtip breaches the surface. When the wingtip does breach the surface tough, the curved wing will have more of a loss of lift than a flat wing. It also gives some stability in yaw and roll.
Most SUP foils have 60-70 cm struts. If you're going to make a 26 inch (66 cm) wide flat wing, it seems like that would limit your carving ability with no downward curve or angle to the wingtips.
Looking at others who I'm sure have tried many iterations of design, Takuma, gofoil, and slingshot sup foils all have curved wings.