Nazsail said: My thinking is a cammed sailed. The pop of the rotation at the gybe or tack sending shock waves thru the water should be enough to scare the sharks away...
Sorry, completely wrong! The pop of the cam indeed sends shock waves through the water, but the shark thinks that it’s a fish in distress, floating on its side, flapping its tail, so the shark heads straight to where the sound originated.
This is the real reason that cammed sails are becoming more and more unpopular, due to the declining population of windsurfers who use these sails.