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advance ratio

noun (aeronautics)
1.
the ratio of wind speed along the axis of a rotor or propeller to the speed of the blade tip
2.
the ratio of forward flight speed to the speed of the rotor tip of a helicopter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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