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wet adiabatic
5 Structure is sealed to house fuel [see * wing, but
adjective also applicable to fuselage, fin or horizontal tail,
eg Airbuses].
wet adiabatic See saturated adiabatic, SALR.
wet and dry bulb See pychrometer.
wet assembly Important technique for modern aerospace
structures in which all primary components are not
only given successive surface treatments but are put
together and joined while their surfaces are still wet; eg
each component would be anodised, then coated with
primer and finally with Thiokol sealer, rivets or bolts also
being coated with Thiokol except in case of interferencefit
bolts (Taper-loks or radius-nose Hi-locks) which fill
holes completely.
wet boost Boost pressure permissible for piston engine
with water injection in operation.
wet builder Manufacturer employing wet-assembly
techniques.
wet-bulb potential Temperature air parcel would have if
adiabatically cooled to 100% RH and then adiabatically
brought to 1,000 mb level.
wet-bulb thermometer Has sensitive element surrounded
by muslin kept moist by supply of water, hence reading
gives indirect measure of relative humidity.
wet emplacement Rocket test emplacement or vehicle
launch pad whose flame deflector and nearby parts are
cooled by deluge of water.
wet film Film, usually large-format, used in traditional
optical camera.
wet filter Particles are retained by a liquid film on
element surface.
WET FUR Mnemonic for remembering aircraft
components for recognition purposes: wings, engines, tail,
fuselage, undercarriage, radiators (or radomes) (UK,
WW2).
wet H-bomb Thermonuclear device whose fusion
material is liquid, cryogenic or otherwise not a dry solid.
wet layup Fabrication of composite structure using
reinforcements saturated with liquid resin.
wet lease Hire of commercial transport from another
carrier complete with crew (at least flight crew, but often
not cabin crew) and in effect forming continuation of
previous operation, with major servicing performed by
owner, but with hirer’s logo and insignia temporarily
applied.
wet pad Wet emplacement for launches.
wet point, wet pylon Wet station.
wet rating Power or thrust with water or water/
methanol (rarely, water/alcohol) injection.
wet-run anti-icing Surface kept continuously above
temperature at which droplets freeze.
wet sensor ASW sensor dropped or dunked into ocean,
eg sonobuoy.
wet side Especially in a long banana-shaped accessory
gearbox, the portion on which are mounted the fuel, oil
and hydraulic pumps, and other items involving fluids.
wet start Faulty start of gas turbine in which unburned
or burning fuel is ejected from tailpipe.
wet station Plumbed for fuel [or other liquid] carried in
external tank.
wet suit Standard anti-exposure suit for working in sea;
eg in winch rescue.
wet sump Piston-engine sump which serves as container
for entire supply of lube oil.
WGU
wet takeoff Takeoff with water injection.
wetted area Total area of surface of body over which
fluid flow passes and on which boundary layer forms. In
case of aircraft usually simplified to visible external skin,
ignoring inner surfaces or air inlets, ducts, jetpipes and
air-conditioning system.
wetted fibre Fibre, eg carbon/graphite/boron/glass,
coated with same resin as will be used to form matrix of
finished part.
wetted surface See wetted area.
wet thrust 1 Thrust of jet engine with water injection.
2 Confusingly, thrust with afterburner.
wetting agent Surface-active agent which, usually by
destroying surface tension, causes liquid to spread quickly
over entire surface of solid or be absorbed thereby.
wet weight Weight of devices plus liquids normally
present when operating.
wet wing Wing whose structure forms integral fuel tank.
Note: not merely a wing in which fuel tanks are housed.
wet workshop Space workshop launched as operative
rocket stage whose propellants must be consumed or
removed prior to equipping as workshop in space.
WEU 1 Assembly of Western European Union [defence
organization of 10 original countries, created 1954 by
Modified Brussels Treaty, office B-1000 Brussels] (Int.).
2 Warning electronic unit.
WEWO, Wewo Wing Electronic Warfare Officer
(RAF).
WF US mission prefix, weather-reconnaissance fighter.
W F Total weight of fuel.
W f 1 Mass flow rate of fuel, various further suffixes.
2 Gross weight with full tanks.
WFA WXR [weather radar] flat-plate antenna.
WFC 1 Wallops Flight Center (NASA).
2 Wet-film camera.
3 War Finance Corporation (US, WW1).
WFD Widespread fatigue damage.
WFG Waveform generator.
WFNT Warm front.
WFO Weather forecast office.
WFOV Wide field of view.
WFP Warm front passage.
WFR Water/fuel ratio.
WFSC Wavefront sensing and control.
WFS Wide-field sensor.
WFU Withdrawn from use.
WFZ Weapons-free zone.
WG 1 Working group.
2 Water gauge.
3 Weapons-grade Pu.
Wg Maximum growth, section width of tyre [tire].
w g Helicopter rotor upwash velocity normal to chord.
W/G Water/glycol.
WGD Windshield (windscreen) guidance display,
transport-aircraft HUD for Cat IIIB operations.
WGF Wideband gap-filler.
WGMD Wire-grid micrometeoroid detector.
WGN White gaussian noise.
WGS 1 Weapon guidance system (GPS).
2 Followed by 72 or 84, World Geodetic Survey [1972]
or System [1984].
3 Wideband gapfiller satellite, or system.
WGT Weight.
WGU Waveguide unit.
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