The AC72 (America's Cup 72 class) is a class of

wingsail A wingsail, twin-skin sail or double skin sail is a variable-Camber (aerodynamics), camber aerodynamic structure that is fitted to a marine vessel in place of conventional sails. Wingsails are analogous to Wing, airplane wings, except that they ...

catamaran A catamaran () (informally, a "cat") is a watercraft with two parallel hull (watercraft), hulls of equal size. The wide distance between a catamaran's hulls imparts stability through resistance to rolling and overturning; no ballast is requi ...

s built to a box rule, which governs the construction and operation of yachts competing in the 2013

Louis Vuitton Louis Vuitton Malletier SAS, commonly known as Louis Vuitton (, ), is a French Luxury goods, luxury fashion house and company founded in 1854 by Louis Vuitton (designer), Louis Vuitton. The label's LV monogram appears on most of its products, ...

and the

America's Cup The America's Cup is a sailing competition and the oldest international competition still operating in any sport. America's Cup match races are held between two sailing yachts: one from the yacht club that currently holds the trophy (known ...

races. The class was subsequently replaced by the smaller

AC50 The AC50 (defined in the America's Cup rules as AC Class yacht, or ACC) was a wingsail catamaran development rule that governed the construction of the yachts used in the 2017 Louis Vuitton Cup and the 2017 America's Cup. Like the larger AC72s ...

class.

Background

Following the

2010 America's Cup The 33rd America's Cup between Société Nautique de Genève defending with team Alinghi against Golden Gate Yacht Club, and their racing team BMW Oracle Racing was the subject of extensive court action and litigation, surpassing in acrimony ev ...

, where the

Golden Gate Yacht Club The Golden Gate Yacht Club (GGYC) is a San Francisco, California, U.S. based yacht club founded in 1939. History In 1939 the first members built a clubhouse on a barge in the San Francisco Marina. After the 1989 Loma Prieta earthquake severely ...

's '' USA 17''

trimaran A trimaran (or double-outrigger) is a multihull boat that comprises a main hull and two smaller outrigger hulls (or "floats") which are attached to the main hull with lateral beams. Most modern trimarans are sailing yachts designed for recrea ...

defeated the catamaran ''

Alinghi 5 ''Alinghi 5'' is a (waterline length, LWL), beam sloop-rigged catamaran built by Alinghi for the America's Cup (33rd edition), 33rd America's Cup. The boat was launched on 8 July 2009 when the hull was lifted from the construction shed in Vi ...

'', it was decided by the winners that the next

competition would be sailed in catamarans in the hope of making the sport more attractive to television audiences. At the same time a smaller sister class, the

AC45 The America's Cup World Series are match races and fleet regattas used as heats for the 2013 America's Cup and the 2017 America's Cup. The Yachts AC45 and AC45F The World Series uses AC45 catamarans, a one-design wingsail catamaran designed spe ...

, was developed to allow teams to practice and adjust to the new formula as well as create a greater exposure of sailing to the general public with the

America's Cup World Series The America's Cup World Series are match races and fleet regattas used as heats for the 2013 America's Cup and the 2017 America's Cup. The Yachts AC45 and AC45F The World Series uses AC45 catamarans, a one-design wingsail catamaran A c ...

Specifications

The AC72 has the following maximum specifications: *Overall length: *Waterline length: *Beam: *Weight: *Maximum draught: *Crew: 11 Maximum speed Using foils for the first time in the America's Cup the AC72 was expected to sail faster than the wind: upwind at 1.2 times the speed of the true wind, and downwind at 1.6 times the speed of the true wind. But in fact it proved faster, averaging about 1.8 times the speed of the wind with peaks slightly over 2.3. A multiple of 2.79 times wind speed was achieved by

Emirates Team New Zealand Team New Zealand or TNZ is a sailing team based in Auckland, New Zealand, representing the Royal New Zealand Yacht Squadron. The team has been branded as Emirates Team New Zealand at America's Cup competitions since 2007. Team New Zealand be ...

in practice, which sailed at 44.15 knots (81 km/h, 50 mph) in 15.8 knots of wind on July 18, 2013. Typical racing speeds are over 30 knots (55 km/h, 34 mph) with the boats capable of sailing well over 40 knots (74 km/h, 46 mph) in the right conditions. The fastest race speed recorded was on

which was 47.57 knots (88 km/h, 55 mph) in 21.8 knots of wind (2.2 times the wind speed) on September 24, 2013. Features * Pedestals * Multi speed winches * Backstays * Crossbeams * Wing Pod * Digital Performance Indicators * Soft Sails * Wing-controlled cables * Three separate cockpits * Buttons on wheels

In competition

The boats have been used in the

2013 Louis Vuitton Cup The 8th Louis Vuitton Cup was held during July and August 2013, in San Francisco, California, United States of America. The three contenders were Artemis Racing (Sweden), Emirates Team New Zealand (New Zealand), and Luna Rossa Challenge (Italy). ...

and the

2013 America's Cup The 34th America's Cup was a regatta, series of yacht races held in San Francisco Bay in September 2013. The series was contested between the defender Oracle Team USA team representing the Golden Gate Yacht Club, and the challenger Emirates Team ...

. By mid-June 2013, all boats had "lined up" and conducted trials against each other on the planned race track in

San Francisco Bay San Francisco Bay (Chochenyo language, Chochenyo: 'ommu) is a large tidal estuary in the United States, U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the cities of San Francisco, California, San ...

, notably

Oracle Team USA Oracle Team USA is an American yacht racing syndicate initially formed to compete for the 2003 America's Cup. They competed again in the 2007 event before winning the 33rd America's Cup regatta in 2010 – representing the Golden Gate Yacht Cl ...

vs.

Artemis Racing Artemis Racing is a professional sailing team founded in 2006 by businessman and sailor Torbjörn Törnqvist, named after Artemis, the ancient Greek goddess. Timeline * 2007: won the MedCup circuit, then called Breitling Medcup, and the TP52 Wo ...

and

vs.

Luna Rossa Challenge Luna Rossa Prada Pirelli, originally named Prada Challenge, then Luna Rossa Challenge, is an Italian sailboat racing syndicate first created to compete for the 2000 America's Cup. It won the Louis Vuitton Cup on its first attempt in 2000, but t ...

List of AC72 catamarans

Incidents

On 17 October 2012,

Oracle Racing Oracle Team USA is an American yacht racing syndicate initially formed to compete for the 2003 America's Cup. They competed again in the 2007 event before winning the 33rd America's Cup regatta in 2010 – representing the Golden Gate Yacht Club. ...

's AC72 pitchpoled (somersaulted) and

capsized Capsizing or keeling over occurs when a boat or ship is rolled on its side or further by wave action, instability or wind force beyond the angle of positive static stability or it is upside down in the water. The act of recovering a vessel fr ...

, causing severe damage to the yacht. The wingsail was completely destroyed while being swept under the

Golden Gate Bridge The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the strait connecting San Francisco Bay and the Pacific Ocean in California, United States. The structure links San Francisco—the northern tip of the San Francisco Peni ...

by a strong ebb tide. On 9 May 2013,

's AC72 pitchpoled and broke apart, resulting in the death of crew member Andrew Simpson. The other two teams,

, and

Team New Zealand Team New Zealand or TNZ is a Sailing (sport), sailing team based in Auckland, New Zealand, representing the Royal New Zealand Yacht Squadron. The team has been branded as Emirates (airline), Emirates Team New Zealand at America's Cup competiti ...

, both suffered minor setbacks, including hitting seals and damaging their wing sails, resulting in loss of sailing time.

References

External links

{{2013 America's Cup America's Cup yachts Catamarans Box rule sailing classes 2013 America's Cup