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VSDR
3 VDL(2) specific DTE address.
VSDR Variable-speed digital recorder.
VSER Vertical-speed and energy rate.
VSF Void-sensing fuze.
VSFI Vertical-scale flight instrument.
V SFL Level-flight stalling speed with flaps set for
landing.
VSG Vibrating-structure gyro.
VShorad Very short-range air defense (USA).
VSI 1 Vertical-speed indicator, output is rate of climb
or descent.
2 Vertical soft-iron; component of Earth’s field.
3 Vapour space inhibitor = VPI.
4 Vacuum superinsulation.
5 Velocity and steering indicator.
6 Variable-swath imagery.
7 Vertical situation indicator.
V SI Indicated stalling speed [avoid confusion with V s1 ].
V s (in) Stalling speed, clean, in inverted flight.
VSIP Virtual-system implementation.
V6, V16 Vasi with 6 or 16 boxes, the 16-box being on
both sides of the runway.
VSJ Vazduhoplovni Savez Jugoslavije, aeronautical
sport union of former Yugoslavia.
VSL Vertical-speed limit [A adds advisory, which may
be preventative or corrective].
VSLD Velocity-, or vertical-, search lookdown.
V-sled, VSLED Vibration, structural life and engine
diagnostic system.
VSM 1 Vertical-separation minimum, or minima.
2 Very small munition.
VSMI Verein Schweizerischer Maschinen-Industrieller
[office, CH-8032 Zürich] (Switzerland).
V s0 Stalling speed at MTWA with flaps at landing
setting, engine[s] idling.
V s1 Stalling speed at MTWA in a specified configuration
other than clean.
V s1g Stalling speed at MTWA under 1 g vertical
(normal) acceleration; obtained from V s by correcting for
any imposed normal acceleration that may have been
present during an actual measured stall; a ‘pure’ V s not
normally entering into performance calculations.
VSP Vertical speed; VS more common.
VSR 1 Very short range.
2 Volume search radar.
3 Valve-seat recession.
VSRA V/STOL research aircraft (NASA).
VSRAD Very short range air defence.
VSRS Variable-speed rotor system.
VSS 1 Video signal simulator.
2 Variable-stability system.
3 Vehicle systems simulator.
VSSA Variable-stability simulator aircraft.
VSSC Vikram Sarabhai Space Centre (India).
V SSE Minimum ‘safe sungle-engine’ speed, selected by
manufacturer, for intentionally shutting down one engine
in flight for pilot training; in UK and some other countries
this is prohibited below 3,000 ft (907 m) AGL.
VSSG Vertical Separation Study Group (Navsep).
VST Variable-stability trainer; aeroplane with avionics
and flight-control surfaces added to enable it precisely to
duplicate flight characteristics of other types.
V st One reference states ‘stall or minimum flight
VTO
speed, flaps up, no power’; not a normally recognised
abbreviation.
V-Star Variable search and track air-defence radar.
V/STOL Vertical or short takeoff and landing.
VSTT Variable-speed training target.
VSU Voltage-sense unit.
VSV Variable-stator vane, or valve [A adds actuator,
AS adds actuating system].
VSVT CAA of lithuania (1992), in 1994 became
DCA(2).
VSW 1 Vertical speed and windshear; hence VSWI = *
indicator.
2 Variable-sweep wing.
3 Verification software.
VSWE Virtual strike warfare environment.
VSWR Voltage standing-wave ratio.
VT 1 Vernier thruster.
2 Voltage transient.
3 Vectored thrust.
4 Internal prison, eg for design teams (USSR,
1929–42).
5 Target speed.
6 Video tracker [SC adds system controller].
7 Variable time. or timing.
8 Validity time[s].
9 Vertical tail.
V T 1 Takeoff speed.
2 Confusingly, threshold speed, see V TDM , V Tmax ,
V Tmin .
3 Velocity of target.
4 Threshold voltage, especially that established for
automatic target detection.
5 Alternative to V t .
V t True airspeed, in aerodynamics.
VTA 1 Military transport aviation (USSR, R).
2 Vibration tuning amplifier.
3 Vertex time of arrival.
4 Voice terrain advisory.
VTAS 1 Visual target acquisition system.
2 True airspeed.
3 Voice, throttle and stick.
VTC 1 Vectored (or vectoring) thrust control.
2 Vernier thruster control.
3 Variable time-constant.
4 Vibratory torque control (Teledyne Continental).
5 Vertical turning center [machine tool].
V TD Touchdown [= landing] speed.
VTDF 1 Vectored-thrust ducted fan.
2 Vortex-tube dust filter.
V TDM Minimum threshold speed demonstrated.
VTDP Vectored-thrust ducted propeller.
V i Circumferential component of propeller induced
velocity.
VTK, V TK Vertical track distance.
VTL Prefix to aviation de-icing fluid specification(G).
VTM Voltage-tunable magnetron.
V Tmax Maximum threshold speed, above which risk of
overrunning is judged unacceptable; usually V AT + 15 kt.
V Tmin Minimum threshold speed, below which risk of
stall (esp. in windshear) is judged unacceptable; usually
V AT - 5 kt.
VTO 1 Vertical takeoff.
2 Varactor-tuned oscillator.
3 Volumetric top-off.
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