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AC50

The AC50 is a high-performance foiling catamaran class of yachts designed specifically for the 35th America's Cup, a prestigious international sailing competition held in Bermuda's Great Sound from June 17 to 26, 2017. These twin-hulled vessels, constructed primarily from carbon fiber with titanium components and advanced composites, measure 15 meters (49 feet) in overall length, including a 12.2-meter main hull section and a 3-meter bolt-on bow extension, and are equipped with a 23-meter-high rigid wingsail for propulsion. Capable of reaching speeds of up to 47 knots (87 km/h; 54 mph) through hydrofoiling—where adjustable daggerboard foils lift the hulls out of the water to reduce drag—the AC50 class emphasized one-design elements for hulls, crossbeams, and pods to control costs, estimated at $4–5 million per boat, while allowing innovation in foil systems and wing controls. Operated by a crew of six sailors using hydraulic systems for wing and appendage adjustments—without motors or computer automation—the AC50s represented a shift toward smaller, faster, and more accessible racing platforms compared to predecessors like the AC72, reducing crew size by half and promoting broader team participation. In the event, six international teams competed in qualifier series and match races, with Emirates Team New Zealand ultimately defeating defending champions Oracle Team USA 7–1 to reclaim the America's Cup trophy, showcasing the class's role in advancing foiling technology and match-racing strategy. Post-event, several AC50 hulls were repurposed for training and exhibition, influencing subsequent Cup iterations and the sport's evolution toward even larger foiling monohulls.

History

Creation of the class rule

The AC50 was introduced as a development class for the 35th in 2017, replacing the class from the 2013 edition, which had faced significant controversy over safety issues and a cheating scandal involving the defender. The class rule was released on April 1, 2015, by the Event Authority on behalf of the as defender, in agreement with Emirates Team New Zealand as of record, following the earlier June 2014 announcement of the larger AC62 proposal. The change prompted Luna Rossa Challenge to withdraw as a challenger on the same day, citing disagreements with the protocol alterations. This rule established the AC50 as a wingsail incorporating hydrofoiling capabilities, drawing briefly from the foiling advancements seen in the to enable sustained high-speed flight. Key parameters outlined in the initial rule included a maximum platform length of 15 m, a maximum platform of 14 m, a limited to 6 members, and requirements emphasizing foiling as the primary mode for to achieve speeds exceeding 40 knots. The design of the AC50 aimed to foster closer, more competitive racing by implementing a box rule that permitted technological innovation in areas like control systems while standardizing core elements such as the wingsail and platform; it also sought to lower compared to the , with per-boat construction costs estimated at $4–5 million, significantly lower than the previous class. The rule was finalized later in 2015 after the AC62-to-AC50 transition, with iterative amendments through 2016—reaching version 1.11 by —to enhance safety, ensure competitive fairness, and impose restrictions on shapes that could otherwise lead to unstable or overly aggressive foiling configurations.

Team development and preparations

Six teams participated in the 35th using AC50 yachts: the defender and five challengers—Emirates Team New Zealand, Land Rover BAR, Artemis Racing, , and . Each team assembled multidisciplinary squads of naval architects, aerodynamicists, and engineers to develop their yachts within the class rule's constraints, such as a six-person and a 50-foot . Teams employed advanced design processes to optimize performance, relying heavily on (CFD) simulations for virtual testing of hulls, foils, and wingsails under varying conditions. testing evaluated wingsail , while basin tests assessed hydrodynamic efficiency in simulated waves and winds, allowing iterative refinements without full-scale risks. These methods enabled teams to predict foiling behavior and minimize drag, with emphasizing data-driven iterations from prior experience. All AC50 yachts were constructed from carbon fiber composites for their high strength-to-weight ratio, using autoclave-cured laminates and recycled carbon elements in molds to meet cost and performance targets. Emirates Team New Zealand's , led by design head Dan Bernasconi, featured innovative configurations developed through in-house CFD and testing, built by Southern Spars in . Oracle Team USA's USA 17 evolved from their 2013 designs, incorporating refined shapes and constructed at Core Builders Composites in , focusing on modular components for rapid adjustments. Preparations began in 2015 with prototype testing on smaller foiling catamarans like the AC45S, progressing to full AC50 builds in 2016 and initial sea trials in Bermuda by February 2017. Teams prioritized hydraulic grinding systems powered by crew pedaling and grinding for foil adjustments, alongside intensive training for stable foiling transitions in winds up to 25 knots. Key challenges included achieving the 2,432 kg minimum hull weight while maximizing structural integrity, balancing foil lift to prevent pitchpole incidents during tacks, and adapting appendages to Bermuda's shifty, moderate breezes.

Design and construction

Hull and structural features

The AC50 employs a twin-hull configuration, featuring two narrow hulls connected by crossbeams and central pods that collectively form a rigid platform supporting the crew, equipment, and control systems. This design prioritizes minimal wetted surface area during foiling while providing structural integrity for high-speed operations. The hulls measure 15 m in , with a of 8.47 m achieved through the extended platform when the yacht is elevated on hydrofoils. Construction emphasizes advanced composite materials for optimal strength-to-weight ratio, utilizing a full carbon fiber with predominantly 150 and 300 fabrics layered over an aluminum core. The molds were one-design elements supplied centrally, ensuring identical shapes for all teams. Hulls are fabricated in female molds divided horizontally into upper (including and ) and lower sections, which are then bonded to create a structure capable of withstanding extreme loads. The specified weight range of 2,332–2,432 kg accommodates minor team-specific optimizations within class tolerances, ensuring fairness while permitting subtle refinements. This approach, overseen by builders like Core Builders Composites and Southern Spars, results in a lightweight yet durable platform weighing approximately 2,400 kg in total. Key structural innovations include a detachable 2.7 m bow bolted to the main 12.3 m after-body, facilitating in containers and rapid replacement after damage. Hull profiles incorporate curved s along the to reduce hydrodynamic drag during non-foiling conditions, such as starts or low-wind scenarios. Crossbeams are heavily reinforced with carbon longerons and to distribute the substantial uplift forces from hydrofoils, while the central platform integrates a taut netting over the forward area to enhance movement and weight adjustment without adding excess mass. These elements contribute to the yacht's and responsiveness, with the ballast-free layout depending on six members for dynamic trim via positioning and pedaling.

Wingsail and sail plan

The AC50 class rule specified a rigid wingsail as the primary propulsion element, consisting of a triangular carbon fiber structure mounted on a rotating mast that enabled precise adjustment of the angle of attack. This wingsail had a maximum area of approximately 100 and a height of up to 23.8 meters, adhering to an limit of 24.90 meters to ensure compatibility with venue constraints. The wingsail featured a three-element , including a main , an adjustable flap, and a base section, which allowed teams to modify , , and sheeting for optimal aerodynamic performance across varying wind conditions. Constructed using advanced materials such as carbon fiber composites, alloy honeycombs, and fittings, the design emphasized lightweight strength to withstand dynamic loads during high-speed foiling. Control of the wingsail was achieved through a hydraulic system powered by crew-operated grinders or pedals, which drove rams to adjust the flap angles and overall shape in . Electronic sensors provided data for manual adjustments and limited assistance, enabling rapid responses to wind shifts while integrating with the boat's broader hydraulic network for . This high-aspect-ratio wingsail offered superior over traditional soft sails, particularly in winds of 6 to 25 knots, facilitating sustained foiling and speeds exceeding twice the true wind velocity. Teams optimized flap settings to balance power for upwind legs and reduced for downwind performance, with variations such as broader profiles for enhanced low-speed or sleeker shapes for high-speed , all within the class rule's one-design constraints on overall .

Hydrofoils and control systems

The AC50 yachts featured retractable L-shaped daggerboards constructed from carbon fiber, serving as the primary hydrofoils to generate and elevate the hulls out of the water during high-speed . These incorporated adjustable flaps to control the angle of attack, allowing teams to optimize and reduce based on conditions and phase. The evolved from straighter profiles used in prior classes to curved L-shapes, which improved stability and minimized induced while adhering to class rules that limited the foil tip's arc path to 3.5 meters. Teams experimented with bulbous versus straight tips on the to further balance and hydrodynamic . Complementing the daggerboards, T-shaped rudders provided dual functionality as mechanisms and additional stabilizing foils at the rear of each , contributing to overall and enabling precise during foiling maneuvers. These rudders were hydraulically actuated, allowing rapid adjustments to and angle for turns at speeds exceeding 40 knots. The control systems integrated these hydrofoils through a centralized hydraulic network, powered by crew-operated grinders that recharged accumulators to drive actuators with response times around 0.2 seconds. This setup linked adjustments for foil rake, , and even wingsail elements, with software employing full-state controllers—such as linear-quadratic regulators and Kalman filters—to maintain and track target heights within 0.3 meters. Programmable logic controllers and sensors, including inertial navigation and , enabled load balancing across foils, compensating for nonlinear effects like speed variations and wave disturbances below 1.5 Hz. Foils were engineered for operational speeds over 40 knots, with mechanisms for quick retraction during , non-foiling conditions, or capsize to prevent .

Specifications

Dimensions and weights

The principal dimensions of the AC50 class yachts are strictly defined by the Class Rule to ensure fair competition among challengers and the defender. The overall length is limited to 15.00 m, with the maximum at the set at 8.50 m to accommodate the wide stance required for stability during foiling. Draft measures 2.40 m with foils extended downward, allowing the to lift fully out of the water under optimal conditions, while the is approximately 7,500 kg when fully , encompassing hulls, appendages, and but excluding . Weight regulations form a core constraint of the class rule, mandating a minimum combined hull weight of 2,332 kg for the hulls to prevent overly fragile constructions, with the total boat weight, including foils and wingsail, capped at 7,580 kg. These limits are verified through official measurement by the class measurer prior to events, involving detailed weighing of components and scaling of the complete to confirm compliance. Allowances for minor are permitted during the racing season, ensuring boats remain within tolerances without requiring constant re-certification. Appendage limits further refine the design envelope, with a maximum foil span of 3.05 m for daggerboards to lift generation and structural integrity, and a rudder span capped at 2.40 m for effective without excessive . The wingsail features limits to restrict oversized profiles, promoting aerodynamic within controlled parameters. These specifications, drawn from the AC35 America's Cup Class Rule Version 1.11, demanded extensive use of carbon fiber composites to achieve the required lightweighting while meeting structural demands. The measurement process is overseen by an independent measurer appointed under the class rule, who conducts pre-event inspections including static weighing of the platform (typically around 2,332–2,432 range for ) and dynamic to verify overall dimensions and weights. Teams must submit detailed plans and prototypes for approval, with any deviations resulting in disqualification or modifications; seasonal allowances account for up to 50 of material loss from and use, maintaining parity across the fleet.

Performance metrics

The AC50 class yachts demonstrated exceptional top speeds during the , with the peak recorded velocity reaching 47.2 knots (87.4 km/h) over the water, as measured by official from America's Cup Race Management (ACRM) systems aboard Artemis Racing's Magic Blue. Typical foiling speeds ranged from 30 to 40 knots both upwind and downwind in moderate conditions, enabling the boats to significantly outperform traditional displacement hulls; for instance, in 14 knots of true speed (TWS), downwind peaks approached 40 knots while upwind speeds hit 32 knots. These velocities were achieved through precise , allowing the yachts to maintain efficient apparent wind angles and minimize energy loss during maneuvers. Maneuverability was a hallmark of the AC50 , with acceleration to foiling mode occurring in under two seconds under optimal conditions, transitioning smoothly from initial speeds to full . Tacks and gybes at speed were executed with high efficiency, often completing in less than 20 seconds while preserving , as evidenced by onboard ACRM tracking of GPS positions, , and structural loads during sessions. Upwind (VMG) reached up to 25 knots, reflecting the class's ability to point high—around 25-26 knots boat speed upwind—while optimizing course progress in breezes of 10-15 knots. Efficiency was enhanced by the foiling configuration, which elevated the hulls approximately 0.5 to 1 meter above the water surface, drastically reducing hydrodynamic drag compared to displacement sailing. The wingsail provided substantial aerodynamic power, contributing to lift-to-drag ratios exceeding traditional soft sails, though exact figures varied with wind conditions; onboard ACRM systems captured these dynamics, revealing how the rigid wing maintained high lift coefficients across a broad apparent wind range. Post-race analyses indicated that Emirates Team New Zealand's AC50 exhibited a 5-10% advantage in foiling stability, attributed to superior foil geometry that allowed consistent ride heights and reduced ventilation risks in variable winds. The AC50 performed best in of 10-20 knots, where foiling was reliable and speeds maximized; below 6 knots, the yachts struggled to generate sufficient , defaulting to mode with speeds limited to 15-20 knots. In heavy seas exceeding 20 knots, could disrupt foil immersion, forcing intermittent drops into mode and compromising overall efficiency, as documented in ACRM load and GPS data from testing.

Competition use

Challenger selection series

The Louis Vuitton America's Cup Challenger Series (LVACCS) served as the qualifying competition to determine the challenger for the defender, , in the 35th , held in Bermuda's Great Sound from late May to mid-June 2017. Five challenger teams—, (Great Britain), (Sweden), , and —competed using identical AC50 foiling catamarans, with the defender participating only in the initial qualifiers to earn a potential bonus point for the match. The series structure began with a double round-robin qualifier phase from May 26 to June 4, where each team raced all others twice, accumulating points for wins (one point per win), with bonus points awarded to (two points) and (one point) based on prior World Series performance; the lowest-scoring challenger was eliminated, and the top four advanced to semifinals. In the qualifiers, Emirates Team New Zealand and Land Rover BAR topped the standings among challengers with 8 points each (New Zealand with 8 wins; BAR with 6 wins plus 2 bonuses), followed by Artemis Racing with 5 wins, and SoftBank Team Japan with 3 wins; Groupama Team France finished last with 0 wins and was eliminated, hampered by inconsistent performance and equipment challenges. The semifinals, held June 6–9 as best-of-nine match series (first to 5 points), featured Emirates Team New Zealand defeating Land Rover BAR 5–2, despite a dramatic capsize by New Zealand in race 4 that damaged their boat but did not derail their lead, while Artemis Racing advanced by beating SoftBank Team Japan 5–3, the latter plagued by reliability issues including structural damage and foil failures during races. SoftBank Team Japan's struggles were evident throughout, with frequent mechanical setbacks underscoring the high-stakes emphasis on design durability, as teams were restricted to a single AC50 yacht with no provisions for swaps or repairs beyond basic fixes. The finals, contested June 10–12 between Emirates and Artemis Racing, followed the same best-of-nine format over 7-leg courses designed for close, high-speed foiling racing, with side-by-side starts enabling aggressive tactics from the outset. New Zealand dominated with a 5–2 , winning through superior foiling stability, precise maneuvers, and tactical execution, particularly in upwind legs where they maintained leads averaging 20–50 seconds; Artemis secured two races but could not overcome New Zealand's consistent speed and error-free . This outcome positioned Emirates as the official challenger, highlighting how the AC50's foiling capabilities allowed for dynamic starts and sustained high-speed duels, while the no-swap rule amplified the importance of reliable engineering over the multi-week series.

35th match

The 35th match was a best-of-13 series contested between defender and challenger Emirates Team New Zealand, using AC50-class catamarans, held from June 17 to June 26, 2017, on Bermuda's Great Sound. Due to Oracle's bonus point from winning the qualifiers, Emirates Team New Zealand started at -1, requiring 7 race wins to claim the . The series showcased high-speed foiling duels in light winds averaging 8-12 knots, with both teams employing advanced AC50 designs optimized for the venue's enclosed waters. Emirates Team New Zealand, skippered by Peter Burling and sailing their yacht Aotearoa, dominated from the outset, winning the first four races on and 18 to lead 4-0. Their flawless execution in foiling tacks and jibes, combined with superior downwind speed, allowed consistent leads of 20-40 seconds per leg. , led by skipper aboard USA, struggled with poor starts and control issues, losing races 1 and 2 due to tactical errors. After weather delays, racing resumed on June 24, where extended their advantage to 5-0 before claimed their sole victory in race 6 through aggressive leeward maneuvers and a key wind shift. Tactical innovations defined the latter stages, as Oracle introduced modified rudder foils for better stability in choppy conditions—which marginally improved their performance but came too late to close the gap. Emirates Team New Zealand's crew, featuring innovative pedal-powered grinders for sustained high-output maneuvers, maintained an endurance edge during prolonged upwind legs. Wind variability in the Great Sound favored New Zealand's lighter, more agile platform, while Oracle's occasional nosedives and start-line penalties compounded their deficits. On June 25, New Zealand won races 7 and 8 to reach 7-1 and win the series. Emirates Team New Zealand reclaimed the on June 25, 2017, ending Oracle Team USA's defense after 13 years and returning the trophy to for the first time since 2000. The 7-1 final score underscored the challenger's technological and strategic superiority in the AC50 era.

Legacy and influence

Technological advancements

The AC50 class marked a pivotal advancement in hydrofoiling technology for competitive , popularizing reliable full-foiling in match racing by lifting the hulls entirely out of the to dramatically reduce hydrodynamic drag and achieve boat speeds exceeding 40 knots in winds as low as 15 knots. This foiling revolution, building on earlier experiments, transformed race dynamics during the , where consistent foiling became essential for competitive performance. In materials and manufacturing, AC50 yachts employed advanced carbon fiber epoxy prepreg composites processed via autoclaving, resulting in hulls and structures that were stiffer, lighter, and capable of greater while maintaining structural integrity under extreme loads. Teams also utilized for prototyping foil components and scale models, which accelerated design iterations and reduced overall build weights and times compared to traditional methods. Systems integration on the AC50 featured innovative cyclor-powered hydraulic systems, where crew members pedaled bikes to generate hydraulic for controlling the wingsail, foils, and rudders, replacing traditional hand-operated winches and enhancing by leveraging human power more sustainably. Additionally, each incorporated over 1,000 sensors to collect on performance metrics, structural loads, and environmental conditions, enabling advanced for immediate optimizations during and racing. Safety and sustainability improvements in the AC50 included refined capsize protocols developed from prior incidents, allowing crews to safely right the boat and resume operations with minimal downtime, as demonstrated in training capsize events. The class also reduced crew size from 11 in the preceding to just 6, minimizing physical demands, improving , and setting new standards for efficiency in professional . The AC50's innovations extended beyond racing through patents and spin-offs, with wingsail technology from teams like Land Rover BAR licensed for wind-assisted propulsion systems on commercial vessels, contributing to lower-carbon maritime operations. Foil designs influenced the adoption of hydrofoiling in Olympic classes, such as the windsurfer, promoting broader accessibility to high-performance foiling.

Evolution to successor classes

The AC75 class succeeded the AC50 as the platform for the 36th in , maintaining core elements of foiling technology and rigid wingsails while shifting to a configuration to prioritize safety through self-righting capabilities, cost efficiency via a one-boat-per-team rule, and enhanced spectator appeal through dramatic foiling maneuvers on a single hull. This evolution addressed limitations of the AC50's design, such as higher capsize risks and logistical complexities, while aiming to broaden participation and to wider communities. A direct spin-off from the AC50 emerged in the F50 class, launched for the league in 2019 as a strict one-design foiling adapted from the 2017 AC50 hulls, with three existing AC50s converted and three new builds to form the initial fleet. Unlike the AC50's relatively open development rules that encouraged innovation in foils and control systems, the F50 standardized all components—including hydraulics, foils, and rigs—to ensure parity and reduce costs, enabling speeds exceeding 50 knots in a global circuit of fleet races across multiple continents. This model influenced the AC40 class introduced in 2024 for youth and women's events in the 37th , a smaller one-design foiling derived from designs but incorporating accessible, battery-powered systems to promote inclusivity and lower barriers to entry. The AC50's foiling advancements accelerated their integration into offshore racing, notably enhancing performance in the class through refined designs that improved speed and stability in races following 2017. Economically, the 2017 event generated approximately $336 million in impact for , including over $90 million in future legacy investments in a ecosystem that advanced composite materials, , and foiling R&D applicable beyond elite competition. However, the AC50's high development costs—often tens of millions per team—highlighted accessibility issues, prompting protocol reforms for the 37th , including a budget cap of approximately €115 million per team and one-design elements to democratize participation and sustain the event's longevity. In the 37th , held in in 2024, Emirates Team New Zealand defended the title against by a score of 7–2, with the AC40 used successfully in parallel youth and women's events.

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