Interesting . But aren't boat hulls are designed for straight line speed over flat water (ideally)? Not radical changes of direction on a steep plane . Rare for a surfboard to be 'flat' on the water for an extended period of time to allow any kind of "gimmick " bottom to work. I like flat or very subtle single ->double. Interesting to see how it would go.
. Boats have had that technology for close to 100 years, i was actually thinking of trying out a similar idea with the next wooden board i am gonna build, just to see what happens