Great discussion everyone.
As was stated above, increasing DH moves the draft forward on cats with masts that aren't too stiff. So does anyone know why on windsurfing sails increasing DH moves the draft aft even though their masts are very bendy? I've always wondered why it's opposite. The only thing I can think of is that since there's no mainsheet to stand up the leech the "effective" sail becomes smaller, moving downwards (as the upper to mid leech twists off), and the draft at the lower 1/3 of the sail doesn't move forward like the mid to upper part so the net result is a "relative" draft movement aft. Anyone know for sure?
Jerry