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Rotorcraft
A rotorcraft or rotary-wing aircraft〔Oxford English Dictionary〕 is a heavier-than-air flying machine that uses lift generated by wings, called rotary wings or rotor blades, that revolve around a mast. Several rotor blades mounted on a single mast are referred to as a rotor. The International Civil Aviation Organization (ICAO) defines a rotorcraft as "supported in flight by the reactions of the air on one or more rotors".〔"ICAO Annex 7." Retrieved on 30 September 2009.〕 Rotorcraft generally include those aircraft where one or more rotors are required to provide lift throughout the entire flight, such as helicopters, cyclocopters, autogyros, and gyrodynes. Compound rotorcraft may also include additional thrust engines or propellers and static lifting surfaces.
==Classes of rotorcraft ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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