flap

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flap

1. Aviation a movable surface fixed to the trailing edge of an aircraft wing that increases lift during takeoff and drag during landing
2. Surgery a piece of tissue partially connected to the body, either following an amputation or to be used as a graft

flap

[flap]
(aerospace engineering)
Any control surface, such as a speed brake, dive brake, or dive-recovery brake, used primarily to increase the lift or drag on an airplane, or to aid in recovery from a dive.
Any rudder attached to a rocket and acting either in the air or within the jet stream.

flap

flap
i. Auxiliary controls built into the wings and used to increase the camber. Flaps may be on the leading or the trailing edges. Trailing edge flaps reduce the stalling angle, whereas leading edge flaps increase the stalling angle when referred to the chord line of the original nonflapped airfoil. Flaps permit aircraft to fly at a lower speed, permitting better control on takeoff and a lower approach speed for landing. Flaps also increase drag, permitting aircraft to descend at a steeper angle. There are various kinds of flaps, such as splits, fowlers, zaps, and slotted.
ii. Short for cowl flaps. See cowl flap.
iii. The up-and-down movement of the tip of a helicopter rotor blade. See flapping.

FLAP

(1)
A symbolic mathematics package for IBM 360.

["FLAP Programmer's Manual", A.H. Morris Jr., TR-2558 (1971) US Naval Weapons Lab].

[Sammet 1969, p. 506].

flap

(storage, jargon)
To unload a DECtape (so it goes flap, flap, flap). Old-time hackers at MIT tell of the days when the disk was device 0 and microtapes were 1, 2, etc. and attempting to flap device 0 would instead start a motor banging inside a cabinet near the disk.

The term is used, by extension, for unloading any magnetic tape. See also macrotape. Modern cartridge tapes no longer actually flap, but the usage has remained.

The term could well be re-applied to DEC's TK50 cartridge tape drive, a spectacularly misengineered contraption which makes a loud flapping sound, almost like an old reel-type lawnmower, in one of its many tape-eating failure modes.

flap

(networking)

FLAP

The communications protocol used by AOL Instant Messenger (AIM). FLAP runs over TCP/IP and provides the header format for transmitting IM commands and data. It includes the SNAC data type, which is the primary data structure transmitted between clients and servers. See OSCAR.
References in classic literature ?
Finding that his look was not returned, or indeed observed by the person to whom it was addressed, John gradually concentrated the whole power of his eyes into one focus, and brought it to bear upon the man in the flapped hat, at whom he came to stare in course of time with an intensity so remarkable, that it affected his fireside cronies, who all, as with one accord, took their pipes from their lips, and stared with open mouths at the stranger likewise.
The sturdy landlord had a large pair of dull fish-like eyes, and the little man who had hazarded the remark about the moon (and who was the parish-clerk and bell-ringer of Chigwell, a village hard by) had little round black shiny eyes like beads; moreover this little man wore at the knees of his rusty black breeches, and on his rusty black coat, and all down his long flapped waistcoat, little queer buttons like nothing except his eyes; but so like them, that as they twinkled and glistened in the light of the fire, which shone too in his bright shoe-buckles, he seemed all eyes from head to foot, and to be gazing with every one of them at the unknown customer.
In the meantime, the captain gradually brightened up at his own music, and at last flapped his hand upon the table before him in a way we all knew to mean silence.