
The America's Cup boat calls for a smaller crew, so to get the same power out of their athletes, they switched from grinders who crank away with their arms, to cyclors who pedal with their legs. The cyclors' role is crucial, because the tuning of the aero part of the boat relies on their leg power. They're not pedalling to propel the boat, they're still sailing using the wind. Instead, they're pedalling to generate power for the systems on the boat, such as the winches for hoisting/trimming sails and for the deploying/retracting the hydro foils.
| Characteristics | Values |
|---|---|
| Reason for pedaling | To generate power for the systems on the boat |
| Systems powered | Winches for hoisting/trimming sails, deploying/retracting hydrofoils |
| Crew size | Smaller |
| Power source | Human energy |
| Power transfer | Via a fluid-coupled gear train |
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What You'll Learn

Cyclors vs grinders: the switch from arm power to leg power
The current America's Cup boat calls for a smaller crew, so to get the same power out of their athletes, they switched from "grinders" who crank away with their arms, to "cyclors" who pedal with their legs.
The cyclors’ role is crucial, because the tuning of the aero part of the boat relies on their leg power. By means of pedals, they power up the hydraulic systems that allow the trimmers to adjust sails and mast.
The electrical needs of a sailing boat are low enough that batteries, charged onshore, can power the boat through even multi-day races. However, the human power of cyclors is used to pump hydraulic fluid. They are not pedalling to propel the boat; they are still sailing using the wind. They are pedalling to generate power to the systems on the boat like the winches for hoisting/trimming sails, and for the deploying/retracting the hydrofoils.
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How the power generated by pedalling is used
The power generated by pedalling on an America's Cup boat is used to power the hydraulic systems that allow the trimmers to adjust sails and masts. The power is also used for the winches for hoisting/trimming sails, and for the deploying/retracting of the hydrofoils. The cyclors, who pedal with their legs, are crucial to the tuning of the aero part of the boat. The power they generate is enough to light up a 50 square metre room.
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The role of cyclors
Cyclors have replaced the role of 'grinders', who turned handles with their arms. The switch to cyclors was made because the current America's Cup boat calls for a smaller crew, so the same power output is needed from fewer people. The human energy generated by the cyclors goes directly into the winches via a fluid-coupled gear train.
During a race, cyclors can develop up to an average of about 2,000 watts of power, which is enough to light up a 50-square-metre room.
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The electrical needs of a sailing boat
The role of the cyclors is crucial, as the tuning of the aero part of the boat relies on their leg power. The power generated by the cyclors powers the hydraulic systems that allow the trimmers to adjust sails and masts. The power is also used for the winches for hoisting/trimming sails, and for deploying/retracting the hydro foils.
The current America's Cup boat calls for a smaller crew, so to get the same power out of their athletes, they switched from "grinders" who crank away with their arms, to "cyclors" who pedal with their legs. The human energy goes directly into the winches via a (fluid coupled) gear train.
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How the weight of cyclors impacts the boat
The weight of cyclors is important because their leg power is used to tune the aero part of the boat. Cyclors are athletes who pedal with their legs to generate power for the boat's hydraulic systems, which in turn allow the trimmers to adjust the sails and mast. This is a more efficient use of human power than the previous system, which used "grinders" who cranked away with their arms. The weight of the cyclors is therefore crucial to the overall power of the boat.
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Frequently asked questions
Pedalling generates power for the systems on the boat.
They include the winches for hoisting/trimming sails and for the deploying/retracting the hydrofoils.
The power helps the boat to perform manoeuvres, such as tacking, jibbing, and turning corners.
The power allows the trimmers to adjust the sails and mast, improving the boat's agility and responsiveness.











































