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V TO
4 Visiting technical officer (UK).
V TO MIL/DefStan requirements define T-O speed as
whichever is lower: highest speed reached before high-lift
devices can be retracted, or 1.6V s in T–O configuration.
VTOCL Vertical takeoff, conventional landing.
VTO grid Vertical takeoff grid designed to reduce
erosion and reingestion problems in operating jet-lift
aircraft from unprepared surfaces.
VTOGW Vertical takeoff gross weight.
VTOL Vertical takeoff and landing; VTOVL adds
redundant second ‘vertical’.
VTP Vertical tailplane.
VTOSS Takeoff safety speed (rotorcraft) (FAA).
VTPR Vertical temperature-profile radiometer.
VTR 1 Video tape recorder.
2 Vocational training, or tax, relief.
3 Variable takeoff rating.
VTRAT Visual threat recognition and avoidance
trainer.
V TRK , V/TRK Vertical track.
VTRM Variable-thrust rocket motor.
VTS 1 Video target simulator.
2 Voice telecom system.
3 Voice, throttle and stick.
V i Circumferential component of propeller induced
velocity.
V TS Velocity of tunnel test section.
vTSPI Video time/space position information.
VU Volume unit.
VTUAV 1 VTOL UAV.
2 VTOL tactical UAV.
VTVL Vertical takeoff, vertical landing [suggest =
VTOL].
V U 1 Relative airspeed across upper (positively
cambered or lifting) surface of aerofoil.
2 Tangential velocity, eg of flow leaving centrifugal
compressor.
3 Utility speed (US usage).
VUAV Vertical UAV.
V/u.h.f. Very and ultra-high frequency; Appendix 2.
Vulcanoids Hypothetical asteroids within the orbit of
Mercury.
Vulkollan Hard erosion-resistant thermosetting plastics
material (trade name, F).
V us Unstick speed of marine aircraft.
VV 1 Vertical visibility, measured (most countries) in
hundreds of feet, or runway visibility value.
2 Valve voltmeter.
3 Validation and verification (sometimes V&V).
4 Velocity vector.
V ZRC
V/V Vertical velocity.
V v 1 Volume ratio for the vertical tail.
2 Vertical velocity on landing.
VVA 1 Zhukovskiy air force academy (USSR, R).
2 Vietnam Veterans of America; F adds Foundation.
3 Voltage variable attenuator.
VV&A Verification, validation and accreditation.
VVI Vertical velocity indicator, suggest = VSI.
VVIA VVA engineering academy (USSR, R).
VVLR Group of Flemish aerospace companies [100
members, office B-2000 Antwerp].
VVR Voice and video recorder.
VVS, V-VS Air forces (USSR, R).
VVT Variable valve timing.
VW Vortex wake; S adds spacing.
V w 1 Tailwind, or tailwind component.
2 Becoming common as alternative to W v for wind
velocity.
VWA Virtual worktop architecture.
VWF Verband der Wissenschaftler an Forschungsinstituten
(G).
V whirl Whirl velocity.
VWL Video wireless link.
VWP Visa-waiver program (Dept. of State).
VWRS Vibrating-wire rate sensor.
VWS 1 Vertical windshear.
2 Ventilated wet suit.
VX 1 General code for nerve gases.
2 Test and Evaluation Squadron (USN).
V x 1 Airspeed for best angle of climb, segment not specified
(US usage).
2 Vertical shear on beam at station x.
VXE Antarctic Development (ie, exploration)
Squadron (USN).
V i Axial component of propeller induced velocity.
VXO Variable crystal oscillator.
V XSE Airspeed for best angle of climb, single-engine (US
usage).
V Y Airspeed for best rate of climb (US usage).
V y Downwash velocity behind wing.
VYRO, Vyro Vertical yaw and roll.
V YSE Airspeed for best rate of climb, single-engine (US
usage, also called blueline speed).
VZ Aircraft designator, vertical-lift research (USA
1957–62).
VZLU Aeronautical Research and Test Institute,
Prague (Czech Rep.).
V ZRC Airspeed for zero rate of climb, at which with one
engine inoperative drag reduces gradient to zero.
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