crab

crab
i. To fly with wings level on a heading that will correct for drift from crosswinds.
ii. To fly with wings level but apply significant rudder to offset the effects of crosswind.
iii. In parachuting, it means facing one’s chute on a diagonal to the wind or crosswind, similar to tacking in a sailboat.
iv. To fly with wings level but with significant yaw due to asymmetric power or thrust.
Port engine failed & aircraft tending to yaw to the port direction. The aircraft would crab if the wings are maintained level.
v. In aerial photography, the angle formed between the flight line and the edges of the photographs in the direction of flight. At the instant of exposure, if the focal plane of the camera is not square with the direction of flight, it causes crab of the photograph. In this process, there is some reduction of overlap as shown in the illustration.
Crab of photograph.
vi. The rotation of an aircraft about its vertical axis, so as to cause the aircraft’s longitudinal axis to deviate from the flight line.

Aviation dictionary. 2014.

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  • Crab — (kr[a^]b), n. [AS. crabba; akin to D. krab, G. krabbe, krebs, Icel. krabbi, Sw. krabba, Dan. krabbe, and perh. to E. cramp. Cf. {Crawfish}.] 1. (Zo[ o]l.) One of the brachyuran Crustacea. They are mostly marine, and usually have a broad, short… …   The Collaborative International Dictionary of English

  • crab — crab; crab·bed; crab·bed·ly; crab·bed·ness; crab·bery; crab·bit; crab·eater; crab·man; crab·stick; crab·ber; crab·by; …   English syllables

  • crab — crab1 [krab] n. [ME crabbe < OE crabba < IE base * grebh , *gerebh , to scratch: see GRAPHIC] 1. any of various decapods with four pairs of legs, one pair of pincers, a flattish shell, and a short, broad abdomen folded under its thorax 2.… …   English World dictionary

  • Crab — steht für Crab Key, Filmtitel Crab Nebula, astronomisches Gebilde Horseshoe crab, Krebs Seitenwindlandung The Crab Cooker Restaurant in Kalifornien Siehe auch Crab Alley Creek, ein Fluss im US Bundesstaat Maryland Crab Island Crab Orchard Crabb …   Deutsch Wikipedia

  • crab — CRAB, crabi, s.m. Nume dat mai multor specii de animale crustacee marine, cu zece picioare, cu abdomenul scurt şi îndoit sub cefalotoracele mare şi turtit; mai cunoscută este o specie din Marea Neagră, cu carnea foarte gustoasă (Carcinus moenas) …   Dicționar Român

  • crab — the crustacean [OE] and crab the apple [14] may be two distinct words. The word for the sea creature has several continental relatives (such as German krebs and Dutch krabbe) which show it to have been of Germanic origin, and some of them, such… …   The Hutchinson dictionary of word origins

  • crab — the crustacean [OE] and crab the apple [14] may be two distinct words. The word for the sea creature has several continental relatives (such as German krebs and Dutch krabbe) which show it to have been of Germanic origin, and some of them, such… …   Word origins

  • Crab — Crab, a. [Prob. from the same root as crab, n.] Sour; rough; austere. [1913 Webster] The crab vintage of the neighb ring coast. Dryden. [1913 Webster] …   The Collaborative International Dictionary of English

  • crab — ► NOUN 1) a marine crustacean, some kinds of which are edible, with a broad shell and five pairs of legs, the first of which are modified as pincers. 2) (crabs) informal an infestation of crab lice. ► VERB 1) move sideways or obliquely. 2) fish… …   English terms dictionary

  • crab — [kræb] n [Sense: 1 3; Origin: Old English crabba] [Sense: 4; Date: 1800 1900; Origin: crabbed] 1.) a sea animal with a hard shell, five legs on each side, and two large ↑claws →↑crustacean 2.) [U] the flesh of this animal that you can cook and… …   Dictionary of contemporary English

  • crab´bi|ly — crab|by «KRAB ee», adjective, bi|er, bi|est. Informal. cross, peevish, or ill natured; crabbed: »He is brought up under the…Puritan maxims of a crabby maiden aunt (Time). –crab´bi|ly, adverb. –crab´bi|ness, noun …   Useful english dictionary

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