Really interesting movie. It looks like when the boat is coming out of the water it loses speed for some reason and falls down, again takes up speed and falls again
It is an unstable system with a positive feedback loop where the foils eventually stall en the whole thing starts all over again. The same thing was happening with the ORMA tris as far back as 5 years ago. That is why foiling moths have a control rod that adjusts the angel of attack of the foil to smaller values when the boat rises too high. The Nacra Freestyle as no such thing and this is the result.
Wouter
