RE: Different technique required for isonic 101 for speed compared to traditional shapes?
Until now, I only used the 7.4 sail on the iS101. Hence the 35 fin.
Will try a shorter fin (30 or 32) once I get to use the 6.2 sail.
Spinout is not the problem. But with a too short fin you don't get enough lift; then the board does not run free and high.
I know from experience that a small fin is key to speedsurfing. But there is a limit to how small you can go. Once you're under-finned, you go slower instead of faster.