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Wagner function
react loads as diagonal tensions; generally, a beam
designed to buckle in operation.
Wagner function A correcting factor due to the fact that,
even when penetrating a “vertical” sharp-edged gust, α
[wing AOA] does not reach its maximum value instantaneously.
wagon wheel See wheel (6).
wagonwheel propellant Solid rocket motor propellant
grain with cross-section having form [positive or negative]
of wagon wheel.
WAGS Windshear alert and guidance system.
WAHC World Airline Hobby Club [office, Erlanger,
KY] (Int.).
WAHS World Airline Historical Society [office,
Jacksonville, FL32225] (US, Int.).
WAI 1 Wing anti-ice, anti-icing.
2 Women in Aviation, International [1994 –, office,
West Alexandria, Ohio] (Int.).
wailer Unmistakeable warning triggered by autopilot
disconnect without human response.
WAIN Wide-area integrated network.
waist 1 Amidships portion of fuselage or hull; thus *
gunner, firing laterally (often from rear midships area).
2 Middle portion of gas-turbine engine, esp. where
diameter here is less than elsewhere; thus * gearbox for
accessories.
waisting 1 Local reduction in diameter caused by plastic
flow under tension, esp. at point of failure.
2 Local reduction of cross-sectional area of body, eg to
conform to Area Rule.
waiting beacon “A low-power omni-directional beacon
used by aircraft waiting their turn to follow the radio
track” (B.S., 1940).
waiver Whereas usual meaning is permanent relinquishment,
in air law or certification it is a postponement.
WAK Wing adapter kit.
wake 1 Fluid downstream of body where total head has
been changed by body’s presence; usually to some degree
turbulent.
2 Wingtip vortices left in atmosphere behind aircraft
whose wing is generating lift, in case of large/heavy
aircraft very powerful and persistent, capable of
destroying light aircraft.
wake constraint Rules defining time or distance in n.m.
which must elapse between arrival or departure of a
Heavy or Super Heavy and the following aircraft.
wake contraction ratio In a helicopter, the ratio of the
radius of the wake to that of the rotor.
wake-interaction noise Generated by impingement of
wake from moving blade on object downstream, eg stator;
in gas turbine hundreds of such interactions can generate
noises at blade-passing frequency of each stage of blading,
plus harmonics.
wake separation Divergence of wakes (2) behind large
aircraft.
wake turbulence Turbulence due to wakes (2), behind
large aircraft with powerful downward motion.
wake turbulence classification Applies to conventional
aeroplanes: light aircraft 7 t (15,432 lb); medium =
7–136 t (c 300,000 lb); heavy = 136+ t (ICAO). The UK
has a definition ‘small aircraft’ = 17–40 t.
wake vortex Wake (2).
walkaround oxygen Bottle carried by aircrew when
disconnected from system.
warbird
walkback Return of deck arrester wire (pendant) to
‘cocked’ or ready position.
walking 1 To advance engine throttles (power levers) in
asymmetric steps, left/right/left etc.
2 To keep straight on takeoff with violent left/right
rudder.
walking beam Pivoted beam transmitting force or
power, eg to retract landing gear; secondary meaning
arising by chance from repeated usage is landing-gear
retraction and bracing beam whose upper end is not
pivoted direct to airframe but to a sliding or translating
member, eg long jackscrew.
walking in/out Movement of aerostat, esp. airship, in or
out of hangar by large ground crew walking while holding
tethering lines.
walking-stick 1 Laser used to indicate ground clearance
in descent through cloud with ceiling close to terrain (not
colloq.; name derives from stick of blind person).
2 Gas-turbine vaporizing burner in which fuel is heated
in tube with 180° bend looking like top of *.
walk-on service Airline service in which anyone could
walk directly on board, buying ticket from cabin crew [not
after 9-11, but gradually restored in 2004].
walk-up service See preceding.
walkway Catwalk or other narrow structure provided in
airship (rarely, large aircraft of other type) to provide
human access to other part; hence * girder.
wall 1 Sides of tyre, between wheel and tread.
2 Internal boundaries of wind tunnel; not only vertical
sides.
wall constraint Distortion of flow round model in tunnel
with closed working section arising from fact that walls
are seldom aligned with streamlines.
wall energy Energy per unit area of boundary between
oppositely oriented magnetic domains.
Wallops Flight Facility NASA island complex on US
east coast [Hampton, VA] used for nearly all small rocket
launches.
wallowing Uncommanded motions about all three axes.
Walter Emergency locator beacon emitting batterypowered
pulses.
WAM Window addressable memory.
WAMRS Water-activated mask-release system.
Wams, WAMS 1 Weapon-aiming mode selector.
2 Women Aircraft Mechanics Service (1942 –) (US).
3 Wide-area master station.
WAN Wide-area network (distributed systems).
wander See apparent precession.
wandering Slow and apparently steady uncommanded
change in heading; may from time to time reverse itself.
Wanganui Blind skymarking of target obscured by
cloud: Main Force set zero wind and on a given heading
bombed on parachute flare (RAF WW2).
WAP Wireless application, or access, protocol [mobile
telephones].
WAPS, Waps 1 Weighted airman promotion system
(US).
2 Wide-area precision surveillance.
3 Whole-airframe parachute system.
WAR Warning.
War Air Service Program American (DoD) plan for civil
airline routes, equipment and services following withdrawal
of CRAF aircraft.
warbird Historic military aircraft, real or replica.
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