autorotational

autorotation

[aw-toh-roh-tey-shuhn]
noun Aeronautics.
the condition of flight occurring when lift is derived solely from the action of air upon the unpowered rotor of a moving helicopter or autogiro.

Origin:
1915–20; auto-1 + rotation

autorotational, adjective
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World English Dictionary
autorotation (ˌɔːtəʊrəʊˈteɪʃən)
 
n
the continuous rotation of a body in an airflow, such as that of the rotor blades of a helicopter in an unpowered descent

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