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vector computer
7 In translation from Italian, rocket launch vehicle.
8 Prefix to three-digit heading passed to interceptor
engaged in interception (for recovery, corresponding
word is steer).
vector computer Device for solving vector triangles, eg
CSC.
vectored Capable of being pointed in chosen directions.
vectored attack Surface attack in which weapon carrier
is vectored (4) to weapon-delivery point by unit which
holds contact on target (DoD, NATO).
vectored thrust Propulsive thrust whose axis can be
rotated to control vehicle trajectory; term normally
applied to swivelling-nozzle jet engine of aeroplane,
corresponding term for space and military rockets being
usually TVC.
vector flight control Control of trajectory by vectored
thrust.
vectoring Vectored.
vector force Resultant of wing’s lift [or lift coefficient]
and pitching moment [or its coefficient], acting through
c.p.
vectoring in forward flight See viff.
vector quantity One that has magnitude and direction.
vector sight Traditional type of bomb sight incorporating
mechanical representation of vectors of relevant
vector triangle.
vector steering Control of trajectory by vectored thrust.
vector triangle Closed figure formed from three vectors,
eg (1) heading/TAS, track/GS and W/V, or (2) lift, drag
and resultant force on lifting wing.
vector velocity See vorticity. Tantological on its own,
velocity implying direction.
Vectra Extremely strong liquid-crystal polymer, injection
moulded and often strengthened with chopped
graphite or glass (Hoechst Celanese).
VEDM Vehicle and engine display management.
vee-belt V-belt.
vee depression Vee-shaped low extending between two
highs, usually with squall.
veeder counter Stepping digital counter, eg odometer;
today often LED or LCD.
vee engine Piston engine whose cylinders are arranged in
two inclined in-line rows (banks) in V form seen from
either end, driving on common crankshaft; hence vee-12
(often called V-12) ** with six cylinders in each bank.
vee formation Aircraft formation in shape of horizontal
V proceeding apex-first, for symmetry with odd number
of aircraft.
Veep VIP.
veering Change of wind direction clockwise seen from
above; now applies in either hemisphere.
vee tab Elevator spring tab with no-load up-deflection
balanced by positive [typically + 10°] trim tab feature of
some large aircraft in 1940s.
vee tail See butterfly.
V EF Speed at which critical engine failure occurs in
accelerate/stop takeoff; defines V 1 as * plus speed gained
with critical engine inoperative during time pilot takes to
recognize situation and respond. In US often V ef .
vegetable Mine laid by aircraft at sea (RAF, WW2),
hence gardening.
vegetable oil Several, esp. castor, used for engine lubrication
pre-1935.
VEGV Variable exit guide vane.
velocity of advance
VEH Variable edge enhancement, see EH.
vehicle Self-propelled, boosted or towed conveyance for
transporting a burden on land, sea or through air or space.
This is DoD/NATO wording. Only possible word in most
generalized contexts, and also only word covering
aircraft, spacecraft, missiles, RPVs etc. Air * identifies
flying portion of weapon or reconnaissance system that
has extensive non-flying portions.
vehicle axes Axes, usually cartesian, related to vehicle
rather than to Earth or space.
vehicle correlator Radar subsystem intended to
eliminate clutter caused by detection of large numbers of
road vehicles [e.g., fleeing civilians] whose speeds exceed
lower limit for detection in look-down mode.
vehicle mass ratio Ratio of final mass of vehicle, usually
M f , after cutoff or burnout of propulsion to initial mass,
usually M o . Normally applied to rocket vehicles.
veil cloud Loose term meaning either Cs or cloud
forming thin veil on mountain.
VEK Equivalent airspeed (EDP).
VEL 1 True airspeed (EDP).
2 Velocity.
vela sensor Usually measures velocity and angle of
attack.
velocimeter 1 Generalized term for velocity meter.
2 CW-reflection Doppler system for measurement of
radial velocity, ie speed of approach or recession relative
to observer.
velocity 1 Measure of motion; speed (linear or angular)
in specified direction.
2 Loosely (though common in fluid flow), speed. SI
unit is m/s. For some conversion factors, see speed.
velocity blast contour Plot of jet wake velocities immediately
behind large jet as it proceeds from gate to
takeoff point. Usual measure is 6 ft (1.83 m) above ground
at distance 50 ft (15.24 m) behind tail.
velocity budget Sum of all velocities in planning spaceflight.
velocity factor Ratio of speed of RF wave along
conductor to its speed in free space, usually 0.6 to almost
unity; symbol k. In typical co-axial cable value is about
0.66, often expressed as a percentage.
velocity gate Basic ability of CW, Doppler and certain
other tracking radars to sense and lock on to particular
radial velocity characteristic of target. Hence ** pull-off,
basic ECM technique to pull radar off target signal and
thus give infinite JSRR.
velocity gradient Rate of change of fluid speed per unit
distance traversed perpendicular to streamlines, eg in
boundary layer.
velocity head Not accepted term; usually means pitot
pressure but has even been used to mean kinetic energy of
unit mass of fluid.
velocity jump Angle between launch line and line of
departure (ASCC).
velocity microphone Electrical output = f(V) where V is
mean speed of particles on which sound waves impact.
velocity modulation Various techniques of modulating
electron beams, eg by h.f. transverse field which impresses
sinusoidal velocity contour causing corresponding
variation in intensity of scanning spot.
velocity of advance Airspeed past propeller blades
ignoring speed due to rotation of blades; essentially
750