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Q
Q 1 Quantity of electricity, esp. electric charge; unit,
coulomb.
2 Applied shear force [see q2].
3 JETDS code: sonar.
4 JETDS code: special, or combination of purposes.
5 Probability of failure.
6 Quantity of light, heat or other EM radiation.
7 Static moment of area about any axis.
8 Aircraft category, target (USAF 1948–62).
9 Modified-mission prefix: drone or RPV (USAF,
USN, since 1962).
10 Modified-mission suffix: electronic countermeasures
(USN 1945–62).
11 Generalized symbol for torque.
12 Common prefix ‘quiet’.
13 Quadrature, and quadrature component of coherent
video (radar) signal.
14 Squall[s].
15 Enthalpy (H is more common).
16 Volume of fluid [gas or liquid]; see next.
17 Confusingly, also flow rate, especially of fuel
consumption [q is preferred].
18 Reactive power.
19 Calorific value of fuel.
20 Interference factor.
21 Quality, figure of merit.
22 See Q-factor.
q 1 Dynamic pressure, ½ρV 2 ; see q , qα.
2 Shear stress [τ is preferred].
3 Tetrode.
4 Heat flux (rate of flow).
5 Angular velocity (rate of change) in pitch, i.e. pitch
rate.
6 Generalized symbol for rate of flow, eg volume,
energy, fuel, etc.
7 Range (Breguet formula).
8 Pitch rate, or AMSU pitch-rate output.
Q – Störindex; German measure of annoyance-weighted
sound pressure level (see noise).
q 1 Replacing q 1, at least in US [marked with asterisk].
2 Non-dimensional pitch rate q/.
Q-aerial Combination of dipole plus quarterwavelength
of twin-wire line to match feeder impedance
to dipole.
Qα, Q-alpha, QA Free-stream dynamic pressure
½ρV 2 α.
Q-ball, q-ball Spherical or hemispherical-nosed instrument
package on nose of spacecraft or aircraft sensing q,
AOA, AOY, total temperature and other parameters.
Q-band Obsolete EM radiation band with limits 33–50
GHz (US), 26.5–40 GHz (UK), now covered by K, L
bands.
Q-bay Heated and pressurized compartment for reconnaissance
sensors, including large camera looking
through quartz window.
Q-code Basic telecommunications code of three-letter
groups in three sections: QAA–QNZ are limits of
Aeronautical Code; QOA–QQZ is Maritime; QRA–QUZ
is for all services. Many of the entries which follow are
from this code, of which nine are still in use.
Q-correction That applied to observed altitudes of star
Polaris (because not quite at N celestial pole).
Q-dinghy Oval, for a crew of up to 8 (RAF, WW2).
Q-factor 1 Figure of merit of inductance, ratio of reactance
to resistance.
2 Ratio of energy stored to energy dissipated per radian
in electrical or mechanical system.
3 Generally, sharpness of resonance or frequency selectivity
of vibratory system having one degree of freedom,
mechanical or electronic.
Q-fan Quiet fan.
q-feel Flight-control feel synthetically made to resemble
natural feedback from aerodynamic loads by making it
approximately proportional to dynamic pressure.
Q-meter Instrument for measuring Q (1).
q-pot Device, typically a sealed cylinder open to ram
pressure, containing a bellows, movable piston or other
sensor, to provide an output proportional to IAS.
Q-series propellants Patented (Thiokol) slow-burning
solid fuels for gas generation with LL-521 coolant keeping
flame below 1,093°C.
Q-Shed Proposed QRA hangar for three RAF airfields
in UK.
Q-site Dummy airfield with simulated flarepath and
other lights (UK, WW2).
q, Q-spring Mechanical connection with stiffness
proportional to dynamic pressure.
q-stops Mechanical limits on flight-control system
response, and thus surface movement, commanded by
q-system.
Q-switching Extremely rapid switching of laser by
means of Kerr cell or similar opto-electronic device; essential
for shortest-duration high energy bursts lasting only
a few ns.
q-system That sensing dynamic pressure, eg drawing
processed signal from ADC, and feeding it to flightcontrol
and other q-sensitive systems or devices.
QA 1 Quality assurance.
2 Quasi-analog.
3 See Q-alpha.
QAA Quality Assurance Agency for Higher Education
(UK).
QAAC Quebec Association of Air Carriers, also called
AQTA, [Dorval, PQ] (Canada).
QAB 1 Quality Assurance Board (MoD-PE, UK).
2 Code: “May I have clearance for – from – to – at
FL –”
QAC 1 Quality action case.
2 Civil aircraft qualification (F).
QAD Quick attach/detach.
QADDM Quasi-analog DDM(1).
QAE Quality assurance evaluator.
QAF Code: “Will you advise me when you are/were
at –”
QAG Code: “Arrange your flight to arrive at/over at –”
QAH Code: “What is your height above –”
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