All I know is what I read about it, after the cup, when someone from Oracle was being interviewed. He said, the ground crew for the solid wing was a huge expense, and they could have gone nearly as fast, for half the cost, with soft sails. That was why I was surprised they chose a boat that's nearly as big, and with the wings too. I don't see much of a cost savings there. I hope they decided to come up with a better way to control the foil's angle of attack.