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WASAA
WASAA Wide-area search [and] autonomous-attack:
M adds munition, MM miniature munition.
WASD Wide-area surveillance and detection.
WASG 1 Warranty and service guarantee.
2 World Airline Suppliers’ Guide.
wash 1 Wake (colloq.).
2 To play upon or around, as ‘the hot jet can * tyres of
aircraft astern’.
washed Subjected to impingeing flow of fluid, especially
of hot gas.
washed out Failed course of instruction, esp. as pilot.
wash-in, washin Inbuilt wing twist resulting in angle of
incidence increasing towards tip.
washing fluid For cleaning aircraft exterior, typically
mains water, possibly with a little detergent; for engine
compressors, distilled water plus 1–11 per cent solvent,
plus [option] inhibiting oil.
washing machine Trainer used by commanding officer
or CFI and thus that in which failed pupil makes last flight
(US colloq., probably arch.).
wash-out, washout 1 Inbuilt wing twist resulting in angle
of incidence reducing towards tips.
2 To fail course of flight (pilot) instruction.
3 Failed pupil pilot.
4 Removal of particulate matter from atmosphere by
rain.
5 See next.
washout phase Point at which flight simulator can no
longer sustain sensation of acceleration.
wash primer Self-etching primer to prepare surface of Al
or Mg for subsequent priming or painting.
WASP, Wasp 1 War Air Service Program (DoD).
2 Wide-area special [or surveillance] projectile (USAF).
3 Women Air Service Pilots (US, replaced WAFS
1942–44).
4 Weasel attack signal processor.
5 White alternate sector propeller [black/white to
prevent deaths on the ground].
6 Windshear airborne sensors program (NASA/FAA).
Waspaloy Registered (Pratt & Whitney) nickel alloys
for gas-turbine rotor blading and similar purposes, typically
with about 19% Cr, 14% Co and also Mo, Ti, Al etc.
WASR Wideband antennas and sources research
(AFRL).
Wassar Wide-angle search synthetic-aperture radar.
wastage Those pupils who fail a course of instruction,
esp. aircrew; hence * rate, % failing.
waste energy Energy not put to use, that in propulsive
jet being W(v j –V)/2g, where (v j –V) is waste velocity.
waste gate Controllable nozzle box for exhaust gas
turbine of turbocharged piston engine; hence ** valve,
which when open allows gas to bypass turbine but which
gradually closes with height until at rated full-throttle or
other selected height valve is closed completely.
wastes 1 Human body wastes, esp. fecal.
2 Surplus radioactive equipment and materials.
waste velocity In the propulsion of any aircraft, the
difference between the speed of the propulsive jet (behind
anything giving propulsion, e.g. a propeller or helicopter
rotor) and the TAS, i.e. (v j –V). At the start of conventional
takeoff * is 100%; it would be zero were it
possible for a high-speed aircraft to leave its jet at rest with
respect to surrounding air.
WAT 1 Weight/altitude [density altitude of airfield]
/temperature; factors independent of runway which
govern each takeoff and determine whether aeroplane can
meet specified positive climb criteria after engine failure
at V 1 ; pronounced ‘watt’, but invariably written all in
capitals.
2 Western Atlantic (ICAO, RVSM).
WATA World Association of Travel Agents (Int.).
watch office Aerodrome air traffic control centre (UK
1918). Progressively replaced after c 1933 by control
tower, but term still common in 1939–45.
WAT curve Graphical plot of WAT limitation for
particular aircraft type; hence WAT limit, limiting
value(s) of WAT at which performance is minimum for
compliance with requirements.
water Modern gas-turbine fuels typically contain 0.028
per cent by volume, still enough to cause freezing problems.
water bag Polythene bag carrying water ballast.
water ballast Standard ballast carried by competitive
sailplane.
water barrier 1 Runway overrun barrier using water as
retarding material.
2 Notional barrier to prolonged spaceflight caused by
fact that plants used for fresh food/oxygen continuously
convert more material to water than they return in
consumable form.
water bias See sea bias.
water bomber Aircraft designed for surface (eg forest)
firefighting by dropping large masses of water; can be
marine aircraft with means for quick on-water replenishment
using ram inlet on planing bottom.
water cart Dispenser of water to aircraft on apron, with
supplies of either or both demineralized water for engines
or potable water for passengers.
water-collecting sump Low point in any system where
water could collect, esp. fuel tank and tray under vapourcycle
air-conditioning coils, from which water can be
extracted.
water-displacing fluid Commercial liquids (eg LPS-3)
which preferentially attach themselves to metal surface in
place of local droplets of moisture, thus arresting corrosion.
water doors Watertight doors in the planing bottom of
a seaplane or amphibian used as a fire bomber.
water equivalent depth Measure of depth of precipitation
contamination on runway; WED = actual depth ×
density, thus 20 mm slush with SG 0.5 gives WED 10 mm.
For water, *** = actual depth.
waterfall Basic model of software life cycle.
water flaps Surfaces hinged about near-vertical axis near
afterbody keel of marine aircraft (esp. jet) which when
under water are used differentially for steering and
together for braking (usually also used as airbrakes).
water gauge Pressure expressed as height of column of
water; 1 in H 2 O = 249.089 Nm –2 ; 100 mm = 980.66 Nm –2 .
water injection Injection of demineralized water, either
pure or with 30–67% alcohol or (more commonly)
44–60% methanol, into cylinders of piston engine to cool
charge and eliminate detonation at maximum BMEP, or
into compressor inlet or combustor of gas turbine to cool
air and thereby increase density and thus mass flow and
power.
water jacket
cylinder.
water jacket
Container for cooling water around
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