AC75

AC75

The AC75 is a class of high‑performance foiling monohull developed for the 36th and 37th iterations of the America's Cup; it replaced prior multihull and monohull designs and produced a technological shift in sailing campaigns. The class enabled dramatic speed increases and tactical evolution among syndicates from the Royal New Zealand Yacht Squadron to Luna Rossa Prada Pirelli, provoking debates in World Sailing and among naval architecture firms such as New Zealand‑based and European design consultancies. Development involved leading design houses, top‑tier fabrication yards, elite sailors from Ben Ainslie‑era teams to veterans of the Louis Vuitton Cup and Extreme Sailing Series.

Design and Engineering

The AC75 originated from a rule authored by the America's Cup Class policy group and overseen by the Royal New Zealand Yacht Squadron and the America's Cup Event Authority, provoking collaboration between firms like Pure Design‑style consultancies and bespoke naval architects. Key features include dual canting ballast bulbs, twin foil arms with T‑foils, and a single center‑line mast system influenced by innovations from the 37th America's Cup program and prototypes trialed in the GC32 and International Moth classes. Structural engineering involved composites labs linked to organizations such as University of Auckland research groups, European composite suppliers with histories in Formula 1 and Aerospace sectors, and testing facilities formerly used by America's Cup syndicates like Oracle Team USA and Emirates Team New Zealand. Hydrodynamic and aerodynamic optimization used computational fluid dynamics workstreams inspired by studies published in venues frequented by Royal Institution contributors and engineers who had previously worked on AmericaOne and Alinghi campaigns.

Development and Construction

Development programs were typically run by syndicates headquartered in countries including New Zealand, Italy, United Kingdom, United States, and Switzerland, engaging shipyards and builders with pedigrees including the Kingdom of Saudi Arabia‑funded projects and European composite houses once tied to Team Brunel initiatives. Construction sequences combined infusion‑molded carbon fiber hulls, autoclave cures, and precision machining by suppliers formerly active in Airbus and Rolls‑Royce supply chains. Teams coordinated with professional sailors who had raced in the Volvo Ocean Race, America's Cup World Series, and Swan 65 events to iterate control systems, hydraulic actuation, and foil geometry. Trial programs were staged at venues like Auckland's Waitematā Harbour, Cagliari in Sardinia, Cowes, and San Francisco Bay, using tow tank data, wind tunnel parallels derived from Imperial College London partnerships, and sea trials that echoed earlier preparations by Team New Zealand and Luna Rossa.

Racing Performance and Tactics

On the race course, AC75 yachts reached foiling speeds and upwind VMG previously associated with multihulls such as those in the A-Class Catamaran circuit and foiling craft from the F50 fleet. Tactics evolved from strategies common in the Louis Vuitton Cup and World Match Racing Tour, integrating crew roles developed by figures from Ben Ainslie Racing and veterans of Alinghi Red Bull Racing. Manoeuvres such as foiling gybes, foil re‑entry, and hatch management required coordination reminiscent of Team New Zealand's grind system innovations and the athlete conditioning found in Team Oracle USA training regimens. Race committees, umpires, and match officials with backgrounds in Royal Yachting Association adjudication and International Sailing Federation protocols had to adapt match racing rules to high‑speed incidents, drawing from precedents set during the 36th America's Cup.

Notable Yachts and Teams

Prominent syndicates campaigning AC75 yachts have included the Royal New Zealand Yacht Squadron's Emirates Team New Zealand, Luna Rossa Prada Pirelli representing the Circolo della Vela Sicilia lineage, INEOS Britannia backed by personalities and organizations tied to INEOS and Ben Ainslie, and American Magic connected to historic American yards. Competitors often featured sailors with pedigrees in the Volvo Ocean Race, Olympic Games, and the America's Cup World Series, and designers who previously worked for campaigns such as Alinghi and Oracle Team USA. Media coverage invoked outlets experienced with major sailing events like Sky Sports, TVNZ, Rai, and NBC Sports; the campaigns also drew sponsorship from luxury brands with histories in the Louis Vuitton Cup and corporate partners familiar to F1 audiences.

Rules and Class Regulations

The AC75 operates under a class rule book developed by the America's Cup Event Authority and the Protocol Committee with input from national authorities such as Yachting New Zealand and the United States Sailing Association. Regulations specify dimensions, foil types, safety systems, and crew limits mirroring frameworks previously negotiated for classes in the America's Cup match racing era and refined by legal advisers experienced with disputes like those involving BMW Oracle Racing and Luna Rossa Challenge. Measurement, scrutineering, and protest procedures follow precedents set by international regattas including the World Sailing‑sanctioned events and the match racing formats of the Louis Vuitton Challenger Series.

Category:Sailing