flapping


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Related to flapping: flapping tremor

flapping

[′flap·iŋ]
(metallurgy)
Striking through the surface of molten copper to hasten oxidation by increasing the exposure to air.

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.

flapping

A condition in which a route in a network becomes unavailable and available over and over again. See route dampening.
References in classic literature ?
He turned his collar down from his ear and listened, but as before only the whistling of the wind could be heard, the flapping and fluttering of the kerchief tied to the shafts, and the pelting of the snow against the woodwork of the sledge.
He felt glad, turned down his coat-collar and listened with strained attention, but in spite of all his efforts nothing could be heard but the wind whistling between the shafts, the flapping of the kerchief, and the snow pelting against the frame of the sledge.
The wind was blowing directly off Point Pedro and the high mountains behind, and because of this was squally and uncertain, half the time bellying the canvas out and the other half flapping it idly.
Fifteen minutes passed, the Reindeer sinking deeper and deeper, her mainsail flapping in the calm.
It was while they were thus engaged that Brady's attention was attracted by the dismal flapping of huge wings.
Above the nocturnal diapason of the teeming jungle sounded a dismal flapping of wings and over head, through the thick night, a shadowy form passed across the diffused light of the flaring camp-fire.
As he ran toward the man, Bradley heard above him the same uncanny wail that had set every nerve on edge several nights before, and the dismal flapping of huge wings.
As they ran, shouting, forward, it was obvious to them that the weird and terrible apparition was attempting to seize James; but when it saw the others coming to his rescue, it desisted, flapping rapidly upward and away, its long, ragged wings giving forth the peculiarly dismal notes which always characterized the sound of its flying.
This welcome was answered by the flapping of a handkerchief and the shrill "Rah
With a stic I pushed it closer and closer, until at last he touched it wit his beak; the paper was then instantly torn off with fury and at the same moment, every bird in the long row bega struggling and flapping its wings.
I gazed entranced, till the boat ran into the wind and the flapping sail warned me I was not attending to my duties.
The Professor, dressed in his only suit of shoddy tweeds, but flapping to and fro on the bare boards a pair of incredibly dilapidated slippers, had thrust his hands deep into the overstrained pockets of his jacket.