The AC75 (America's Cup 75 class) is a 75 ft sailboat class, governing the construction and operation of the yachts used in the 2021 America's Cup. The boat type is a foiling monohull with canting ballasted T-wing hydrofoils mounted on port and starboard topside longitudinal drums, a centerline T-wing rudder, and no keel. Speeds of 50 knots were predicted based on computer simulations and in fact have been exceeded in the Prada Cup by the America Magic’s boat in January 2021.