Hi Bill,
I do see your point about the board's lift being a set amount, whether or not it is of gybing design. I now realize you either get the AoA from the boat's angle being ~3 degress higher & crabbing sideways or 3 degrees lower and having the board point 3 higher than the boat.
If you're main concern is with the size of the trunk opening, the Tornado already deals with its wide trunk using slot strips (usually stiff mylar these days). These are very effective at sealing the trunk from water "pumping". The trunk could easily be much wider and wider strips applied.
If the board is 1.0 inches thick itself in the trunk and we want the board to be able to gybe plus and minus 3 degrees, that means the front of the CB trunk at the keel must be 3.2 inches wide. Wow, what a hole, what a wide slot, hard to seal, probably much water pumping going on in the trunk and that is negative horsepower.
Dream On,
Bill
