 Complete the following phrase:  High-performance yachts, including the International C-Class Catamaran, have used or use rigid wing sails, which perform better than traditional soft sails but are more difficult to manage. A rigid wing sail was used by Stars and Stripes, the defender which won the 1988 Americas Cup, and by USA-17, the challenger which won the 2010 Americas Cup. USA 17s performance during the 