AC75
| Development | |
|---|---|
| Year | 2017 - |
| No. built | 8 launched |
| Role | inshore racing |
| Name | AC75 |
| Boat | |
| Crew | 11 + 1 optional guest |
| Displacement | 6,450 kg (14,220 lb) lightship 7,600 kg (16,800 lb) loaded |
| Draft | 5.00 m (16 ft) |
| Hull | |
| Type | Foiling Monohull |
| Construction | carbonfiber |
| LOA | 22.86 m (75 ft) |
| LOH | 20.70 m (68 ft) |
| Beam | 5.00 m (16 ft) |
| Hull appendages | |
| General | topside-mounted ballasted canting T-wing foils |
| Ballast | set in foils |
| Rudder(s) | centerline T-wing rudder |
| Rig | |
| Rig type | bermuda sloop |
| Mast length | 26.50 m (87 ft) |
| Sails | |
| General | two semi-battened mainsail skins, one headsail skin |
| Mainsail area | 145 m2 (1,560 sq ft) |
| Jib/genoa area | 90 m2 (970 sq ft) |
| Spinnaker area | 200 m2 (2,200 sq ft) |
The AC75 (America's Cup 75 class) is a 75ft sailing hydrofoil monohull class, governing the construction and operation of the yachts to be used in the 2021 America's Cup.
The class features a unique combination of sailing systems for a monohull such as hydrofoils mounted on port and starboard topside longitudinal drums, a soft double-skinned mainsail,[1] and no keel.[2]
The rule
Following the 2017 America's Cup, the winning club Royal New Zealand Yacht Squadron accepted a notice of challenge from Circolo della Vela Sicilia that stipulated a monohull in the ship's particulars. 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.[3] The return to monohulls with soft sails after three America's Cups on multihulls with wingsails is reminiscent of old America's Cup classes and seaworthy traditions, but the rule includes hydrofoils to attract high performance crews and large TV audiences.[4]
Under the protocol, each competing club may build two yachts, but two-boat testing is not allowed except during the PRADA Christmas Cup on December 17-20 2020 and for the defenders during the PRADA Cup January 15 - February 22 2021. In order to reduce design and testing costs of the class' unique features, the rule specifies foil controlling systems all manufactured by the defending club's team and foil arms all manufactured by the Challenger of Record's builder Persico Group.
The boats
| club | yacht name | christening date | builder | notes |
|---|---|---|---|---|
 Royal New Zealand Yacht Squadron |
Te Aihe / The Dolphin | 6 September 2019 | Team New Zealand | test boat[5] |
 New York Yacht Club |
Defiant | 14 September 2019 | American Magic | test boat[6] |
 Circolo della Vela Sicilia |
Luna Rossa | 2 October 2019 | Persico Group | test boat[7] |
 Royal Yacht Squadron |
Britannia | 4 October 2019 | Carrington Boats | test boat[8] |
| New York Yacht Club |
Patriot | 16 October 2020 | American Magic | race boat[9] |
| Royal Yacht Squadron |
Britannia II | 17 October 2020 | Carrington Boats | race boat[10] |
| Circolo della Vela Sicilia |
Luna Rossa | 20 October 2020 | Persico Group | race boat[11] |
| Royal New Zealand Yacht Squadron |
Te Rehutai / Sea Spray | 18 November 2020 | Team New Zealand | race boat[12] |
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.[13]
Speeds
Speeds of 50 knots have been claimed based on computer simulations.[14]
Notable high speeds actually recorded on the water have been:
- 49.1 knots by Te Rehutai on December 17, 2020.[15]
- 50.25 knots by Britannia during day 4 of the Prada Cup January 23, 2021.
- 53.31 knots by Patriot (American Magic) during day 1 of the Prada Cup Semifinals January 29, 2021.[16]
Patent claim
In 2020 patent infringement was claimed in New Zealand regarding the canting foil system used in the boats that have been produced.[17]NZ 740860
See also
References
- ^ https://www.sailingworld.com/story/racing/sails-of-the-americas-cup/
- ^ Hillary Noble (5 April 2018), America's Cup designer spotlight, North Sails
- ^ AC75 class rule version 1.1, americascup.com, 29 June 2018
- ^ Bernie Wilson (21 November 2017), Team New Zealand unveils radical foiling monohull, Associated Press
- ^ Team New Zealand launch their first AC75
- ^ A first flight and a name
- ^ 'Luna Rossa', the new flying monohull
- ^ Ineos Team UK name their first AC75 'Britannia'
- ^ Patriot christened and launched</ref, Chase boats alongside also providing flotation, by tying themselves up to attachment points on Patriot.
- ^ INEOS TEAM UK christen 'Britannia'
- ^ Luna Rossa launches its second AC75
- ^ Emirates Team New Zealand launch Te Rehutai
- ^ Matthew Sheahan (23 October 2020), Challenger Revelations, planetsail.org
- ^ "American Magic shines as racing begins". Scuttlebutt Sailing News. 17 December 2020. Archived from the original on 27 December 2020. Retrieved 27 December 2020.
{{cite web}}:|archive-date=/|archive-url=timestamp mismatch; 15 January 2020 suggested (help) - ^ "How fast can Team New Zealand's AC75 go? Grant Dalton explains the new boat's design". TVNZ. 5 September 2019. Archived from the original on 15 January 2020. Retrieved 3 November 2020.
{{cite web}}:|archive-date=/|archive-url=timestamp mismatch; 27 December 2020 suggested (help) - ^ "Prada Cup Semi-Final Day 1". America′s Cup. 29 January 2021. Archived from the original on 29 January 2021. Retrieved 29 January 2021.
- ^ Todd Niall (27 October 2020), Brazilian designer claims patent for AC75 canting foils, Stuff Ltd
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