That brings up an interesting point. When Paul Larsen was trying to break the world speed sailing record in Sailrocket 2 he ran in to a wall where his foils just could not go faster, there was non-linear effect where drag increased exponentially. He went to an expert who designed a super-cavitating foil and he broke through the barrier and got up over 65 knots. I believe the barrier was around 54 knots which is just where the AC75s got to. I wonder how the foil designers are dealing with this effect. I believe there was a trade off with low speed performance in making the super-cavitating foils.
Since this is the eye candy thread I'll throw in a beauty shot of Sailrocket 2
