variable /ve.ri.b(.)l/ adjective
changing or changeable . Winds are more variable in the northern hemi-sphere than in the southern hemisphere.
variable geometry /ve.ri.b(.)l di.m.tri/ noun technology which allows the angle between wing and fuselage to be altered to give a more or less swept wing for better high-speed and low-speed flight characteristics
variable-geometry /ve.ri.b(.)l di.m.tri/ adjective referring to an aircraft with hinged wings that can move backwards or forwards during
245 venturi
flight (NOTE: The wings are swept back to give low drag in supersonic flight and are moved forwards for takeoff and landing.)
variable pitch propeller
/ve.ri.b(.)l p.t. pr.pel./ noun a propeller with a mechanism to change the blade angle, to suit flight conditions
variable-sweep /ve.ri.b(.)l swip/ adjective same as variable-geometry
variation /ve.rie..(.)n/ noun 1. a change or the amount of a change 2. the angular difference between magnetic north and true north, which is measured in degrees and is named east or west according to whether the north-seeking end of a freely suspended magnet lies to the east or to the west of the true merid-ian at that point . variation east, mag-netic least: variation west, magnetic best a mnemonic to help somebody remember whether to add or subtract variation
variety /v.ra..ti/ noun a lot of differ-ent things . Display units provide a wide variety of information relevant to engine and other automated systems operation.
variometer /ve.ri.m.t./ noun an
instrument used for measuring the rate
of climb of an aircraft such as a glider vary /ve.ri/ verb to change, to be dif-ferent . The tropopause over the UK can vary between 25,000 feet and 45,000 feet according to whether the country is covered by a polar or tropi-cal air mass.
VASI abbreviation visual approach
slope indicator vast /vɑst/ adjective large, immense, huge . the vast majority most . the vast majority of people
VCR abbreviation visual control room
VDF abbreviation very high frequency direction-finding vector /vekt./ noun 1. a quantity
with magnitude and direction indicated by a line of a given length, representing magnitude and specific direction . The triangle of velocities is a vector solution of what happens to an aircraft when wind causes drift. 2. a heading given to
a pilot to provide navigational guidance by radar . Wind velocity is indicated by a vector, identified by a single arrow, pointing in the direction the wind is blowing towards.
veer /v../ noun the shifting of the wind in a clockwise direction in the northern hemisphere . The passing of a weather trough is marked by a sharp veer in the direction of the wind. . verb 1. to change in a clockwise direction in the northern hemisphere . Winds veer and increase with height ahead of a warm front. Opposite back 2. to change direc-tion, especially as in an uncontrolled movement . The aircraft veered off the runway into the grass.
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