Quick lunch time session. The 7m was plenty when I was rigging, but as soon has I hit the water, the wind started to drop and I was underpowered. Tried my "home made" carbon wide tail on my boom. It did not break (good news) but I think it is too wide for speedboards as It made the sail feel back handed and caused a few spin-outs, even when underpowered. I think it will be good on a slalom board.