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''USA-17'' (formerly known as ''BMW Oracle Racing 90'' or ''BOR90'') is a sloop rigged racing trimaran built by the American sailing team BMW Oracle Racing to challenge for the 2010 America's Cup.〔 (【引用サイトリンク】title=Title unknown )〕〔 〕〔 (【引用サイトリンク】title=Title unknown )〕 Designed by VPLP Yacht Design with consultation from Franck Cammas and his Groupama multi-hull sailing team, ''BOR90'' is very light for her size being constructed almost entirely out of carbon fiber and epoxy resin, and exhibits very high performance being able to sail at 2.0 to 2.5 times the true wind speed.〔 〕 From the actual performance of the boat during the 2010 America's Cup races, it can be seen that she could achieve a velocity made good upwind of over twice the wind speed and downwind of over 2.5 times the wind speed; this means that downwind she was sailing at nearly four times the speed of the true wind. She can apparently sail at 20 degrees off the apparent wind.〔 〕 The boat sails so fast downwind that the apparent wind she generates is only 5-6 degrees different from that when she is racing upwind; that is, the boat is always sailing upwind with respect to the apparent wind.〔 (【引用サイトリンク】title=Friday the Third. Pt 1? )〕 An explanation of this phenomenon can be found in the article on sailing faster than the wind. ==Design== ''USA 17'' was designed by VPLP. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「USA 17」の詳細全文を読む スポンサード リンク
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