This problem of turtling is a well know issue. Yet it hasn't been addressed by anyone in the primary phase of boat design, other than Bill Roberts. His Supercat and ARC catamarans are the only ones, that I am aware of, that build a large enough mast section to provide sufficient buoyancy to keep the boat from going turtle in all but the most extreme circumstances, this is not by accident …but by design.. Why hasn't anyone else followed suite. Yes you have the Hobie Bob, but that is nothing but an awkward band aid that hurts (or is perceived to hurt) performance. Why not adapt this simple solution to a potentially horrific problem. The increase in mast section size never seems to slow down Bill or Eric on the race course.