the small cut out at the base of my tracker kind of reminds one of the fin experiments for windsurfing of the 70' and 80'. is that it?
i strongly belive that to reduce the drag created by tracker fins you need to let them point inwards close to the board but they need to be parallel further down. i think this is the only way to make a fast board (that is not too wide) with good traction in sharp turns and good lowwind and upwind properties.
i might be wrong but i need to see for myself to finally know.
h.