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Ok...its gyro-copter to start lol. They differ from helicopters in that they are in "Auto rotation" all the time during flight which means the relative wind blows through the rotor causing lift from the underside. An engine driven pusher propeller is used to push the gyro into the wind, hence causing the main rotor to turn and generate lifting forces. In a helicopter, the engine directly drives the main rotor and the tail rotor. The tail rotor is used to offset the huge torque from the main rotor in the helicopter. The gyro does not need this torque corrector as the main rotor is freewheeling and has a rudder in place of a tail rotor for directional control.
When a helicopter engine fails, it must drop a good distance to have the main rotor pick up enough speed to help flair for a lesser crash impact. The gyro is already in auto rotation and hence needs a much much less drop in altitude to keep up rotor speed for a safe landing.
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