Not too sure about that one. Perhaps that could be why their little flap joiner is considered a part of the control system, as it could be connected to a linkage in the main wing that allows the middle of the flap to move backward and forward instead of rotating around a fixed point that lies within the wing somewhere, if that is even allowed within the rules. I just though that would be the simplest solution to being able to deflect a curved flap around a straight line.G'day Kai, welcome to the forum.
Interesting idea. Since under the rules they are required to have one flap on each of the two wings of the foil, how could the flaps be hinged inboard - ie at the foil centre line?