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V
V 1 Volts, potential, e.m.f., also potential energy.
2 Velocity, including TAS, EAS or ASIR.
3 US piston-engine designation prefix, vee-type.
4 US piston-engine designation prefix, vertical orientation,
ie crankshaft vertical (currently in use).
5 JETDS code, visible light(s).
6 Volume, or volume-fraction.
7 Total shear stress.
8 Designation prefix: convertiplane (USAF 1954–62),
V/STOL (USAF from 1954, USN from 1962).
9 US military-aircraft designation modifying prefix:
staff/VIP.
10 Unit designation prefix: airplane (USN 1922–62).
11 Potential energy.
12 Vanadium.
13 Prefix, Victor airway.
14 Varying, variation, or varying between (Metar), or
variable, or variable intensity.
15 Ground/air visual code: require assistance.
16 Secondary station (Loran).
17 Visibility, visual or visual descent point.
18 Experimental (G).
19 Veneer.
20 Vertical load.
v 1 Specific volume of gas.
2 Component of RMS velocity; phase velocity of EM
wave.
3 Thermionic valve.
4 Linear [called lateral] velocity of point due to rotation
of body in pitch.
5 Relative velocity between two moving bodies or
points.
6 Propwash velocity relative to undisturbed air, ie
‘true’ V p .
(V) 1 Suffix indicating item of electronic equipment can
be configured to suit a number of platforms or system
applications. Normally followed by numeral identifying
which (JETDS).
2 121.5 kHz available on ATCC request.
V¯v Vertical stabilizer (fin) volume coefficient.
V¯ Horizontal tail volume coefficient (I t S T /c¯S).
∇ See capital delta [Appendix 1].
V' Radial inflow velocity, eg to eye of centrifugal
V
compressor.
Velocity vector.
Vα Free-stream velocity vector.
V o
Volume rate of flow.
V 1 Decision speed; ASIR defining decision point on
take-off at which, should critical engine fail, pilot can elect
to abandon takeoff or continue. Calculated by WAT and
runway friction index for each takeoff, never less than
V MCG . Also regarded as engine-failure recognition speed,
made up of V EF plus increment due to pilot thinking time.
V2 Two-box VASI, on either side of runway.
V 2 Takeoff safety speed; lowest ASIR at which aeroplane
complies with those handling criteria associated
with climb following one engine failure, normally
obtained by factoring V MCA , V MSL and pre-stall buffet
speed. Aeroplane should reach V 2 at screen after engine
failure at V 1 and climb out to 120 m height without speed
falling below V 2 .
V 3 Normal screen with all engines operating, at which
aeroplane is assumed to pass through screen height in
normal takeoff; usually about V 2 +10kt.
V4 Four-box VASI.
V 4 Steady initial climb speed for first-segment noiseabatement
climb with all engines operating.
V6 Six-box VASI.
V 8 law The law governing noise caused by shear at the
periphery of a jet [proportional to the eighth power of the
shear velocity].
V12 A V6 on each side of the runway.
V16 Two V4 VASIs on each side of the runway.
V90 Category of off-base military airstrips dispersed
through countryside and usable by fighters (Sweden).
V abs Absolute velocity.
V-aerial Two rod conductors balance-fed at apex with
geometry giving desired directional propagation.
V-band Original radar frequency band 46–56 GHz
(obs.).
V-beam radar Uses an inclined and a vertical beam to
determine target bearing, range and altitude.
V-belt Drive belt of tapering cross-section, often coming
to narrow inner edge like V, mating with pulleys having
inclined inner peripheral faces.
V-block Hardwood block with large V-notch used in
hand sheet-metalwork.
V-bombers The UK’s only strategic jet bombers
(1951–90), named Valiant, Vulcan, Victor.
V-diagram A standard procedure for developing software,
in which a V-shape is constructed by listing
development activities on the left and verification activities
on the right.
V-engine See vee engine.
V-force Squadrons equipped with V-bombers; crews
graded as Combat, Select, Select Star [1957–90] (RAF).
V rel Relative velocity.
V-speeds See V 1 et seq.
V-tail See butterfly tail.
VA 1 Volts × amperes; basic measure of a.c. or reactive
electrical power.
2 Visual aids (ICAO panel).
3 Unit prefix: fixed-wing attack squadron (USN).
4 Voice-activated.
5 Air army (USSR).
6 Veterans Administration (US).
7 Visual approach, and VASI.
8 Vortex advisory.
9 Volcanic ash.
10 Virtual airline [simmer].
V A Design manoeuvring speed; on basic manoeuvring
envelope speed at intersection of positive stall curve
(assumed in cruise configuration) with n 1 (limiting positive
manoeuvring load factor). Highest EAS at which
limit load factor can be pulled.
V a 1 Aquaplaning speed; speed (usually ASIR) at which
wheels lose effective contact with runway covered with
standing water.
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