The AC72 (Americas Cup 72 class) is a wing sail catamaran box rule, governing the construction and operation of the yachts to be used in the 2013 Louis Vuitton Cup selection series and the 2013 America's Cup. This new and revolutionary design is extremely expensive and has allowed the development of foils which lift the hull out of the water in some conditions leading to extreme boat speeds. The tight box rule for the AC72 wing sail catamaran sets very narrow ranges for length, beam and wing sail dimensions, but the devil is in the details. The wing sail originally got the most attention in the media but focus has now shifted to the daggerboards and hydrofoiling.

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