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 flaps.
iii. The up-and-down movement of the tip of a helicopter rotor blade. See flapping.

Aviation dictionary. 2014.

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  • Flap — may refer to:* Flap (aircraft), a hinged surface on the trailing edge of an airplane wing * Flapping, one of the basic mechanics of flight in birds * Flap, any hinged plate often used as a cover or a simple one way valve ** Cat flap, a hinged… …   Wikipedia

  • Flap — Flap, n. [OE. flappe, flap, blow, bly flap; cf. D. flap, and E. flap, v.] Anything broad and limber that hangs loose, or that is attached by one side or end and is easily moved; as, the flap of a garment. [1913 Webster] A cartilaginous flap upon… …   The Collaborative International Dictionary of English

  • flap — flap·doo·dle; flap; flap·py; hy·dro·flap; flap·pa·ble; un·flap·pa·ble; flap·per; un·flap·pa·bil·i·ty; un·flap·pa·bly; …   English syllables

  • Flap — Flap, v. t. [imp. & p. p. {Flapped}; p. pr. & vb. n. {Flapping}.] [Prob. of imitative origin; cf. D. flappen, E. flap, n., flop, flippant, fillip.] 1. To beat with a flap; to strike. [1913 Webster] Yet let me flap this bug with gilded wings. Pope …   The Collaborative International Dictionary of English

  • Flap — [flɛp], das; s, s [engl. flap = Klappe, zu: to flap = (mit den Flügeln) schlagen, flattern, wohl lautm.; vgl. ↑ flappen] (Flugw.): an der Unterseite der Tragflächen von Flugzeugen anliegender klappenähnlicher Teil, der zur Erhöhung des Auftriebs… …   Universal-Lexikon

  • flap — [flap] n. [ME flappe < the v.] 1. anything flat and broad that is attached at one end and hangs loose or covers an opening [the flap of a pocket] 2. the motion or slapping sound of a swinging flap [the flap of an awning] 3. Archaic a blow with …   English World dictionary

  • Flap — Flap, v. i. 1. To move as do wings, or as something broad or loose; to fly with wings beating the air. [1913 Webster] The crows flapped over by twos and threes. Lowell. [1913 Webster] 2. To fall and hang like a flap, as the brim of a hat, or… …   The Collaborative International Dictionary of English

  • flap — s.m.inv. ES ingl. {{wmetafile0}} 1. TS aer. superficie aerodinamica ausiliaria mobile, situata sul bordo posteriore dell ala, che serve ad aumentarne la portanza Sinonimi: ipersostentatore. 2. TS autom. in alcuni tipi di pneumatici, fascia di… …   Dizionario italiano

  • flap — [n1] winged or extended part of an object accessory, adjunct, appendage, apron, cover, drop, fly, fold, hanging, lapel, lobe, lug, overlap, pendant, pendulosity, ply, queue, skirt, strip, tab, tag, tail, tippet; concepts 471,824 flap [n2]… …   New thesaurus

  • Flap — 〈[flæ̣p] n.; Gen.: s, Pl.: s; Flugw.〉 an den Unterseiten von Flugzeugtragflächen zusätzlich angebrachte Strömungsklappen, die bei Start u. Landung zusätzlichen Auf bzw. Abtrieb erzeugen [Etym.: <engl. flap »Klappe«] …   Lexikalische Deutsches Wörterbuch

  • Flap — [flɛp] das; s, s <aus engl. flap »Klappe«> an der Unterseite der Tragflächen von Flugzeugen anliegender klappenähnlicher Teil als Start u. Landehilfe …   Das große Fremdwörterbuch

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