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autorotation

[aw-toh-roh-tey-shuhn]

au·to·ro·ta·tion

[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

au·to·ro·ta·tion·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Autorotation is always a great word to know.
So is shear strain. Does it mean:
ratio of longitudinal strain to longitudinal stress
ratio between amount by which a body is skewed and its length
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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