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- Q2297576 subject Q6913774.
- Q2297576 subject Q8878001.
- Q2297576 abstract "Autorotation is a state of flight in which the main rotor system of a helicopter or similar aircraft turns by the action of air moving up through the rotor, as with an autogyro, rather than engine power driving the rotor. The term autorotation dates to a period of early helicopter development between 1915 and 1920, and refers to the rotors turning without the engine.In normal powered helicopter flight, air is drawn into the main rotor system from above and exhausted downward, but during autorotation, air moves up into the rotor system from below as the helicopter descends. Autorotation is permitted mechanically because of both a freewheeling unit, which allows the main rotor to continue turning even if the engine is not running, as well as aerodynamic forces of relative wind maintaining rotor speed. It is the means by which a helicopter can land safely in the event of complete engine failure. Consequently, all single-engine helicopters must demonstrate this capability to obtain a type certificate.The longest autorotation in history was performed by Jean Boulet in 1972 when he reached a record altitude of 12,440 m (40,814 ft) in an Aérospatiale Lama. Because of a −63 °C (−81.4 °F) temperature at that altitude, as soon as he reduced power the engine flamed out and could not be restarted. By using autorotation he was able to land the aircraft safely.".
- Q2297576 thumbnail Airflow_in_auto-2.jpg?width=300.
- Q2297576 wikiPageExternalLink autorotation.html.
- Q2297576 wikiPageExternalLink story.cfm?c_id=1&objectid=10493099.
- Q2297576 wikiPageWikiLink Q11465.
- Q2297576 wikiPageWikiLink Q11705171.
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- Q2297576 wikiPageWikiLink Q25288.
- Q2297576 wikiPageWikiLink Q3367140.
- Q2297576 wikiPageWikiLink Q34486.
- Q2297576 wikiPageWikiLink Q370906.
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- Q2297576 wikiPageWikiLink Q48103.
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- Q2297576 wikiPageWikiLink Q609542.
- Q2297576 wikiPageWikiLink Q6683747.
- Q2297576 wikiPageWikiLink Q6913774.
- Q2297576 wikiPageWikiLink Q794571.
- Q2297576 wikiPageWikiLink Q795064.
- Q2297576 wikiPageWikiLink Q8878001.
- Q2297576 comment "Autorotation is a state of flight in which the main rotor system of a helicopter or similar aircraft turns by the action of air moving up through the rotor, as with an autogyro, rather than engine power driving the rotor.".
- Q2297576 label "Autorotation".
- Q2297576 depiction Airflow_in_auto-2.jpg.