A team of engineers in Canada have built the first successful human-powered helicopter.
The aircraft relies on pedal power alone to achieve lift-off.
The project wins a long-standing challenge set by the American Helicopter Society which offered a prize for a human-powered helicopter that could reach a height of three meters and fly for 60 seconds in a contained area.
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The pilot of the aircraft Todd Reichert is both an aerodynamics expert and a competitive speed skater.