A motor sailing yacht, Wind Surf's sails aren't just for show. "There's more power in the sails than there is in the engines," says Captain Tim Roberts. Occasionally, Captain Roberts will cut the engines and proceed under sail. But there has to be a good wind. Wind Surf can make 9 knots in good wind, and in the Caribbean the Leeward islands are famous for tradewinds, so there's a good chance to go under sail power only.