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V FL
V FL MIL/DefStan defines design speed for landing as
whichever is greater: 1.8V s at MLW with high-lift devices
set for landing, or 1.4V s with such devices retracted.
VFLB Variable-floor-level bridge.
V FLU Critical flutter speed [usually for wing], normally
1.2 V D .
VFMED Variable-format message entry device.
VFO Variable-frequency oscillator.
VFOP Visual flight [rules] operations panel.
VFR Visual flight rules, G adds Group.
VfR Verein für Raumschiffahrt, society for space travel
(G).
VFR-OT, VFR/OT VFR on top.
V frr Becoming used for “take-off failure recognition and
reaction”.
VFSG Variable-frequency starter/generator.
VFSS Variable-frequency selection system.
V FTO V 1 for flexible take-off, factored for full power in
event of one engine failure at reduced rating.
VFW Veterans of Foreign Wars (US).
V FXR(R) Maximum flap-retraction speed.
V FXR(X) Maximum flap-extension speed.
VG 1 Variable-geometry.
2 Vertical gyro.
3 Vortex generator.
4 See V GND .
5 Airline pilots’ association (G).
Vg 1 Geostrophic wind.
2 Gust design speed, usually V B .
V G UK DefStan defines gust speed in two ways: on a
V-n plot, intersection of C Lmax with 20 ms -1 gust, or
V s1 (n G +1)½ where n G is the load factor resulting from
penetrating a 15.24 ms -1 gust at maximum EAS.
V-g Aircraft speed and normal acceleration; hence *
diagram, graphic plot of these parameters, * recorder,
primitive instrument recording speed and applied loading
in vertical (very rarely in other) plane.
VGA 1 Variable graphics array.
2 Video graphics array, 640 × 480 pixels.
3 Video graphics adapter.
VG/DG Vertical gyro/directional gyro.
VGG Visual graphics generator.
Vgh Aircraft speed, vertical acceleration and height;
hence * recorder, continuous recording of these
parameters on wire or tape.
VGI Vertical gyro instrument.
VGK 1 Supreme military command (USSR, R)
2 A CFD method (Fortran) for predicting characteristics
of a 2-D single-element aerofoil.
V GND Velocity relative to the ground, suggest usually =
G/S.
VGPO Velocity-gate pull-off.
V grad Gradient wind.
VGS 1 Velocity-gate steal; usually synonymous with
VGPO.
2 Volunteer Gliding School[s] (UK ATC, now Air
Cadets).
3 Video guidance sensor.
4 Visual guidance system.
VGT Gas-turbine association (Netherlands).
VGTD Gas-turbine APU (R).
VH 1 Designation, very heavy aircraft or unit (SAC,
formerly).
2 Or V H , velocity hold.
vibration meter
V H 1 Maximum speed in level flight with maximum
continuous power; little used outside US. Definition
should add that H = high altitude; this power at
medium/low FLs would usually exceed V DF .
2 Now also taken to mean maximum speed in horizontal
flight.
V/H Velocity/height ratio [in compatible units] in taking
reconnaissance imagery and in sensor design (M0.9/200 ft
gives * = 5).
V h 1 Hump speed.
2 Volume ration of horizontal tail.
3 Helicopter hover induced velocity.
VHDL VHSIC hardware design [or description or
descriptive] language.
v.h.f., VHF Very high frequency, see Appendix 2; /DF,
adds direction finder; /DL, data-link; /PTN = radio link
to public-telephone network.
v.h.f. omni-range See VOR.
VHFRT V.h.f. R/T.
VHL Very high level (software language).
VHMS Vehicle health-management system[s].
VHPIC Very-high performance (or power) integrated
circuit.
VHRR Very-high-resolution radiometer.
VHS Very high speed [electronics].
VHSIC Very-high-speed integrated circuit; Si or SOS,
then GaAs, two to three orders of magnitude faster than
MSI/LSI; -2 adds Phase 2.
V HW , V hw Headwind [head-on component].
VI 1 Visual identification mode.
2 Viscosity index.
3 Video interface.
4 Variable-intensity (eights).
5 Heading [course] to intercept.
6 Association of Flemish Engineers [B-3500 Hasselt]
(Belgium).
V i 1 IAS (not ASIR).
2 EAS.
3 Velocity induced by winglet, normally inwards
normal to direction of flight. Note: winglet lift has a useful
thrust component.
4 Propeller induced velocity, made up of vector sum of
Vi and Vi.
5 Mean velocity of air entering jet-engine inlet.
VIA Versatile integrated avionics.
VIAM All-union (research) institute for aviation
materials (USSR).
Viapure Optical-grade polyurethane interlayer
material.
VIAS Indicated airspeed.
VIB Vibration.
vibrating voltage regulator Controller of d.c. machines
which uses vibrating points to sense voltage and adjust
resistance controlling field current.
vibration indicator Instrument or sensor for either
recording or indicating mechanical vibration either
remote from crew or of too high a frequency to be
obvious, esp. emanating from turbine engines. Modern
turbofan engines are fitted with crystal transmitters whose
signals are filtered to pinpoint the source.
vibration isolater See isolator.
vibration meter Instrument for recording vibration
frequency; very rarely either amplitude or acceleration in
addition.
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