AC75

The AC75 (America's Cup 75) is a racing yacht used in the 2021 America's Cup and 37th America's Cup matches and planned to be used for the 38th America's Cup match. The monohulls feature wing-like sailing hydrofoils mounted under the hull, a soft wingsail, and no keel.

The rule Following the 2017 America's Cup, winners Royal New Zealand Yacht Squadron accepted a notice of challenge from Circolo della Vela Sicilia stipulating a monohull would be used in 2021. Conceptual graphics of a monohull with soft sails and topside canting hydrofoils were released on 21 November 2017, and the first draft of the class rule was published by the defender and the challenger of record on 29 March 2018. The return to monohulls with soft sails after three America's Cups on multihulls with wingsails is reminiscent of earlier America's Cup classes and seaworthy traditions, but the rule included hydrofoils to attract high performance crews and large TV audiences.

Under the protocol, each competing club could build two yachts, but two-boat testing was excluded except during the PRADA Christmas Cup on 17–20 December 2020, and for the defenders during the PRADA Cup 15 January – 22 February 2021. To reduce design and testing costs of the class unique class features, the rule specified foil controlling systems all manufactured by defender team and foil arms all manufactured by the Challenger of Record's builder Persico Marine.

List of AC75 yachts Syndicate Name Shipyard Launched Competitive historyCurrent Notes Emirates Team New ZealandTe AiheETNZ Auckland, 6 September 2019Trial boat (never raced) Sold to Alinghi as a training boat for AC37. Renamed BoatZero American MagicDefiantAmerican Magic Newport, RI, 14 September 2019Trial boat (never raced) Luna Rossa Prada PirelliLuna RossaPersico Marine Cagliari, 2 October 2019Trial boat (never raced) INEOS Team UKBritanniaCarrington BoatsPortsmouth, 4 October 2019Trial boat (never raced) American MagicPatriotAmerican MagicAuckland, 16 October 2020Raced in the 2021 Prada CupUsed as training boat for AC37. De-commissioned in February 2023 INEOS Team UKBritanniaCarrington BoatsAuckland, 17 October 2020Raced in the 2021 Prada Cup Luna Rossa Prada PirelliLuna RossaPersico MarineAuckland, 20 October 2020Winner of the 2021 Prada CupLost the 2021 America's Cup to Emirates Team New Zealand (7–3) Emirates Team New ZealandTe RehutaiETNZAuckland, 18 November 2020Winner of the 2021 America's CupSold to Team Australia Challenge for AC38 Emirates Team New ZealandTaihoroETNZAuckland, 11 April 2024Winner of the 2024 America's Cup Luna Rossa Prada PirelliLuna RossaPersico MarineCagliari, 13 April 2024Raced in the 2024 Louis Vuitton Cup Alinghi Red Bull RacingBoatOneARBRBarcelona, 16 April 2024Raced in the 2024 Louis Vuitton Cup INEOS BritanniaBritanniaCarrington BoatsBarcelona, 1 May 2024Winner of the 2024 Louis Vuitton CupLost the 2024 America's Cup to Emirates Team New Zealand (7–2) American MagicPatriotAmerican MagicBarcelona, 7 May 2024Raced in the 2024 Louis Vuitton Cup Orient Express TeamOrient ExpressMultiplastBarcelona, 29 May 2024Raced in the 2024 Louis Vuitton Cup

The visible differences between designs have been commented by most of the yachtbuilding community and the specialized press as each of the boats were launched.

Speeds Potential speed of was claimed based on computer simulations.

Notable high speeds actually recorded in racing were: by Te Rehutai (in ) on 17 December 2020. by Britannia during day 4 of the Prada Cup 23 January 2021. by Patriot (American Magic) during day 1 of the Prada Cup Semifinals (in breeze gusting up to ) on 29 January 2021. by Luna Rossa (Luna Rossa Prada Pirelli) during day 3 of the Louis Vuitton Cup Final on 29 September 2024. by Britannia (INEOS Britannia) during day 5 of the Louis Vuitton Cup Final on 1 October 2024.

Controversy

Following the release of the canting hydrofoil design in 2017, Brazilian shipwright Manoel Chaves contacted ETNZ to inform them that he held a patent for the proposed design. Team New Zealand apparently ignored correspondence from Chaves' patent attorneys for over two years before simply dismissing the allegations. ETNZ defended themselves with the statement "every good idea has 1000 fathers".

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