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quadruplane
quadruplane Aeroplane with four superimposed wings.
quadruple register Instrument recording wind
speed/direction, sunshine and rain (not snow).
quadruplex Any fourfold system, ie four parallel channels.
quadruplex system Dynamic system that is quadruply
redundant and thus provides multiple failure capability,
eg SFO/FS, DFO and DFO/FS.
quadrupole Idealized noise source made up of four
equidistant sources, each diametrically opposite pair
emitting positive pressure peaks while the other pair are
at peak negative (all having same frequency).
quadrupole resonance Method of detecting small
quantities of specific material by irradiating with RF
tuned to that material’s molecules.
quad tilt-rotor Aircraft lifted and propelled by four tilt
rotors.
qualification Clearance for service; thus also for
production.
qualitative limitation In arms control, eg SALT II,
concerned only with weapon-system capability.
quality control That management function by which
conformance to established standards is assured, performance
is measured, and, in event of defects, corrective
action is initiated (USAF).
quantified Expressed in numerical terms.
quantitative limitation One concerned solely with
numbers, eg of weapon systems in SALT II.
quantized Restricted to particular set of discrete values.
quantum bit Atomic electron or photon.
quantum dot Semiconductor device with overall
dimensions of a few (one definition, 10) nanometres.
quarantine Secure bonded store for parts which, for
whatever reason, are illegal or accompanied by incorrect
documentation.
quart Non-SI measure of capacity, qt = (UK) 1.137
litres, (US) 0.946 litres.
quarter-chord Locus of all points lying at 25% chord (of
wing or other aerofoil), each measurement being in plane
parallel to longitudinal axis of aircraft. Normal interpretation
is that measures are for wing in clean condition,
ignoring ancillary items such as stall-breaker strips and
anything else attached to wing, but including dogtooth
and similar basic modifications to outline.
quarterlights Windows at oblique angle between front
windshield (UK windscreen) and side.
Quarter-Million Aeronautical charts [rarely, maps]
published on scale of 1:250,000 (ICAO).
quarter-phase Electrically 90° (see quadrature).
quarter-turn fastener Cowl or panel fastener released by
90° anticlockwise turn.
quarter-wave aerial One quarter-wavelength long and
resonating at slightly less than 4l where l is length; hence
quarter-wave line is same length of co-axial or twin-wire
transmission line.
quartz Natural and synthesized mineral, SiO 2 , with
many electrical, electronic and refractory structural uses
but noted for piezoelectric properties in perfect-crystal
form.
Quattrocopter Helicopter lifted and controlled by
contra-rotating two-blade rotors on vertical axes at each
corner of a square or X-shaped base; largest would be
manned, smallest 500 g (1.1 lb).
Qubit Quantum bit [pronounced cubit].
quietized
Queen Bee Senior WAAF or WRAF officer on station
(colloq.).
Queen Mary Articulated road vehicle for transporting
dismantled or crashed aircraft (RAF).
quenching 1 Sudden cooling of hot metal in water, oil or
other medium to obtain desired crystalline properties.
2 Blanketing solid grain of rocket in mid-operation,
by various related techniques, to obtain variable-pulse
operation.
Questol Quiet experimental STOL.
QUI Quito, Ecuador, space tracking-station.
quick cam Flap-track profile giving long rearwards
travel to increase area/lift and with sharp downwards
travel at end which, when full flap selected, rotates flap to
landing angle giving high drag.
quick-change aircraft One whose interior is configured
for passenger or freight operation and whose seat units,
passenger-service units, pantries, toilets and often trim
can be removed in minutes and replaced by freight
restraints (attached to original floor rails) and protective
wall panels.
quick-connect parachute Chest-type pack which user can
clip to harness almost instantly.
quick-disconnect couplings Mating fluid-pipe couplings
incorporating self-sealing shut-off valves to allow disconnection
under pressure without loss of fluid.
quick-donning mask Simple oxygen mask, usually of
drop-down type but sometimes carried in separate pack,
which in theory can be put on with one hand in a few
seconds.
quick dump Switch for getting rid of entire load of
rockets, normally by jettisoning launchers.
quick-engine-change unit See engine-change unit.
quickie GCA GCA or PAR approach conducted in
circumstances calling for priority (possibly notified
emergency) and eliminating procedure or identifying turns.
quick-reaction alert In 1960s it was calculated that
Western Europe would have 4 minutes warning of a
Soviet strike by nuclear missiles, so RAF bomber
squadrons practised getting retaliatory V-bombers
airborne within 4 min. of an ‘out of the blue’ warning at
any time of day or night; USAF SAC had parallel
exercises.
quick-release box Parachute-harness latch released by
90° rotation and blow from hand.
quick-search procedure One in which double normal
number of aircraft are used and entire area is searched on
outbound leg (NATO).
Quicktrans Long term contract airlift within Conus in
support of USN, USMC and DoD agencies (US).
quiescent current Flow cathode/anode in absence of
input signal.
quiescent flow Small flow of air maintained throughout
no-load period to keep bleed-air turbine running;
eliminated in modern systems.
quiescent modulation Amplitude modulation in which
carrier is radiated only during modulation.
quiet automatic gain control Automatic variation of bias
of one or more amplifying stages preceding detector, in
which output is suppressed for all signals too weak to
trigger control.
quietized Soundproofed (Piper).
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