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wide-deck
(arguable) but operational fuel of nearly all air forces and
several airlines.
wide-deck Lycoming term for piston-engine cylinder
having wide base held by hexagonal nuts on large-radius
circle; no separate hold-down rings or plates.
widesparead fatigue damage Potentially catastrophic
reduction in strength of structure cause by networks of
small [e.g., microscopic] cracks.
widget Any small cunning, fascinating device.
Widia German range of sintered tungsten carbides with
3–13% Co.
WIDS Weather information display system.
width Maximum lateral dimension of lifting-body
aircraft, equivalent to span.
width of sheaf Lateral interval between centres of flak
bursts or bomb impacts (DoD).
WIDU Wireless Intelligence and Development Unit
(RAF, from October 1940).
WIE With immediate effect.
Wiedemann-Franz law States ratio of electrical to
thermal conductivity for all metals is proportional to °K
(for most metals observed value is slightly higher than **
figure).
Wien bridge Stabilized oscillator whose frequency is
determined by circuits incorporating resistances, capacitances
and two triodes.
Wien law States wavelength of peak radiation from hotbody
source is inversely proportional to °K; =
2,900µ
–––––– .
T
WIFU Weapons interface unit.
WIG, WIGE Wing in ground effect.
wigglystrip Rolled [occasionally machined] refractory
strip with endless square-corner up/down form [combustors
and afterburners].
WII light Wing ice inspection light.
Wilco R/T code: “I will comply with your instruction”.
wildfire Forest fire out of control.
Wildhaber-Novikov Best known form of conformal
gears with mating profiles formed by convex/concave
circular arcs whose centres of curvature are on or near
pitch circles.
Wild Weasel Though originally name of specific
programme, now generalized term for dedicated EW platform
based on airframe of combat (eg attack or fighter)
aircraft.
Williot Diagram which graphically portrays deflections
of all joints (panel points) of loaded planar truss; result
contains small inaccuracies which are removed by Mohr
correction diagram, result being called Williot-Mohr.
will not fire Code sent to spotter or other requesting
agency affirming that target will not be engaged by surface
fire.
willy-willy Tropical cyclone (Australia).
Wimet British range of tungsten carbides.
WIMS, Wims Worldwide intratheatre mobility study.
WIN 1 WWMCCS intercomputer network.
2 Web industrial network.
winch launch Launch of glider by winch, usually locally
built on road vehicle and driven by latter’s engine.
winchman Member of aircrew of rescue helicopter in
charge of winching payloads, eg rescuees, and who may
hand winch to colleague and descend to organize pick-up
of incapacitated rescuee from below.
window
winch suspension Rigging joining kite balloon and flying
cable.
wind across Horizontal component of wind at 90° to
catapult or centreline of (axial or angled) deck.
windage Loss of rpm of rotating device caused by air
drag.
windage jump Vertical jump (up or down) of bullet
trajectory caused by crosswind, eg firing laterally from
bomber or gunship.
wind angle Angle between wind direction and true
course (heading), measured 000–180° L or R of course.
wind axes 1 In UK usage, three rectilinear axes (u, v, w)
with origin within aircraft, ususally at c.g., and directions
each representing component of relative wind in longitudinal,
lateral and vertical planes. Traditional names: lift
axis, + upward; drag axis, + to rear; crosswind axis, + to
left.
2 In US usage, X, Y, Z, each the exact opposite of drag,
sideforce and lift and acting through c.g. to eliminate
rotary and translational motions.
wind cone See windsock.
wind correction angle Difference between course and
track.
wind diagram US for triangle of velocities.
wind direction That from which wind is coming,
expressed as number from 000° to 359°.
wind down Horizontal component of wind along axis of
catapult or centreline of (axial or angled) deck.
Windee Wind-tunnel data encoding and evaluation
(EDP [1]).
wind factor Net effect of wind on aircraft progress,
expressed as ± knots (USAF).
wind-gauge sight Drift meter; instrument which (BSI
definition), by determining track on two or more courses,
enables air, wind and ground speeds to be represented by
vectors (arch.).
wind gradient Rate of change of wind with unit increase
in height AGL; usually factor of interest is component of
wind along runway, thus direct headwind at 150 m/500 ft
veering to crosswind at threshold is regarded as change
equal to full wind speed even though actual wind speed
does not alter. See windshear.
winding See filament *.
WINDMG Wind magnitude.
Windmill An aerobatic manoeuvre comprising an
upward Immelmann followed by a flat spin with AOA of
c90°.
windmill 1 Of inoperative engine, to be driven by
propeller (piston or turboprop) or by ram airflow through
it (turbojet or turbofan); hence windmilling, windmilling
drag etc.
2 Small propeller-like * used on older aircraft to drive
electrical generator and occasionally other machines; in
principle like modern RAT but permanently operating.
3 Of free-turbine propeller, to spin idly in wind when
aircraft parked (normally prevented by brake).
4 Propeller (colloq.).
windmill-brake state Operating condition of helicopter
rotor in which thrust, flow through disc and flow outside
disc are all in same direction, the rotor extracting power
from the slipstream.
wind over deck Vector sum of wind plus speed of carrier.
window 1 Transparent area in skin for aircraft optics or
IR (in latter case not apparently ‘transparent’).
777