Here’s a fascinating article about the Vestas Sailrocket, which broke what was considered a hard limit on sail boat speed:  How a Boat-Plane Hybrid Shattered the Sound Barrier of Sailing – Autopia/Wired.com

When I traveled to Namibia a year before, I had met a daredevil yachtsman with his eyes on a big prize. But now that he has it, all Larsen can talk about is the hydrodynamic frontier. “What we are discovering is that things are not as black-and-white going through this barrier as we thought they were,” he says. The mixture of air, vapor, and very high speed water wrapping itself around a boat at the limit is dynamic and extremely hard to model by computer or even simulate in a high-speed flow tank. To understand it, you must explore it directly, through experimentation. You need SailRocket.