flapping to equality

flapping to equality

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During the movement of a helicopter rotating blade, the speed of airflow over the advancing blade is higher than the retreating blade, resulting in production of an unequal amount of lift. This is called a dissymmetry of lift. To correct this aerodynamic imbalance, the blades are allowed to perform a series of controlled movements to produce equal amounts of lift. This process of equalization is called flapping to equality. See also dissymmetry of lift.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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