flapping

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flapping

[′flap·iŋ]
(metallurgy)
Striking through the surface of molten copper to hasten oxidation by increasing the exposure to air.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

flapping

flappingclick for a larger image
The angular movement of a rotor blade above or below the plane of the hub. Blades ride higher and lower during their rotation, but they can do so only if they are allowed to move freely about a horizontal hinge or flexible root element. Design features allow for the blades to flap vertically about the flapping hinge. Blade flapping compensates for dissymmetry of lift as the retreating side flaps down resulting in increased angle of attack with consequent increase in lift. The advancing blade flaps up and the angle of attack reduces resulting in decreased lift.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved

flapping

A condition in which a route in a network becomes unavailable and available over and over again. See route dampening.
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