In 2013, the AeroVelo Atlas Human-Powered Helicopter made a flight lasting 64 seconds at a height of up to 3.3 m (10ft 10in), to win the AHS Sikorsky Prize. The challenge was set in 1980, for a human to hover at a height of 3 meters for 60 seconds. Until this day, the $250,000 prize went unclaimed for 33 years, despite the best efforts of dozens of teams around the world. The winning design was a quadcopter with a bicycle-mounted pilot (Todd Reichert) at the center of a vast but light four-truss frame. By pedalling, the humanpowered four huge, aerofoil rotors, turning quite slowly but still providing the necessary lift. The American Helicopter Society (AHS) funded the prize. «