autorotation

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Autorotation - the phenomenon of self-propelled rotation of a rotor carrier, such as a helicopter or a gyroplane, caused by a swirl of air. At the time of autorotation, the impeller has no mechanical connection to the propulsion system, which is typical of a gyroplane and a helicopter emergency.

In the helicopter, the unidirectional clutch allows the main rotor to rotate freely while the engine is stopped. The mechanical connection of the main rotor to the tail rotor (a helicopter equipped with such a propeller) is retained, which provides pilot directional control. The rotating rotor during the autorotation draws energy from the plane of the incoming air (indirectly from the weight of the falling machine) without using the propulsion (motors), providing a flight. Pilot helicopter on a non-motorized flight, with directional control, periodic control and general control, can land on autorotation. At autorotation, the rotation of the main rotor does not exert a torque on the helicopter. Airflow through helicopter rotor during normal flight and autorotation flight Bibliography

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