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switchology
and electronic later, allowing for on-line, real-time
messages, data transfer, storage or display.
switchology Fluency in human interaction with operating
systems (colloq.).
swivel Pivoted attachment for windsock.
swivelling engine Entire engine, or liquid-rocket thrust
chamber, that is gimbal-mounted or pivoted so that thrust
axes can rotate relative to vehicle.
Swizz SWIS (colloq.).
SWL 1 Strategic-weapon launcher.
2 Single-wheel loading.
SWLAN Secure wireless local area network.
SWMCM Shallow-water mine countermeasures.
SWO Station Warrant Officer (RAF).
Sword 1 Stand-off all-weather observation and reconnaissance
drone.
2 System for all-weather observation by radar on drone.
3 Short-range missile defence with optimised radar
distribution (US).
SWOS Synoptic weather observing (or observation)
station.
SWP Stub-wing pod.
SWPA South-West Pacific Area (painted on many
captured Japanese aircraft 1944-45).
SWPC Small War Plants Corporation (US, 1942–50).
SWPI Confusingly wing leading-edge sweep angle.
SWR 1 Standing wave ratio.
2 Surface-wave radar.
SWS 1 Standard warning system (CAA).
2 Strategic Weapons School.
SWSL Supplemental Weather Service location.
SWTDL Surface-wave tapped delay line.
SWTL Surface-wave transmission line.
SWTRR Software test readiness review.
SWU Switching unit.
SWY Stopway.
SX Sheet explosive.
S x Simplex.
SXGA Super extra graphics array, 1,280×1,024 pixels.
SXT, Sxt Sextant.
SXTF Satellite X-ray test facility.
SYC Statistical yield control.
SYCAF Système de Couplage Automatique sur Faisceau
(ILS coupler, F).
Sycep Syndicat des Industries de Composants
Electroniques Passifs (F).
Syco Symbiotic communications (USAF/DARPA).
Syers, SYERS Senior Year electro-optical relay [or
reconnaissance] system [P 3 adds preplanned productimprovement
program].
Sygong System go/no-go.
sylphon Stack of aneroid capsules; sometimes called *
tube.
symbology Symbols conveying meanings to human
beings, the technology of their design and production and
their incorporation in systems and displays; most
important are alphanumerics, in various national
languages, followed by more than 9,000 standard conventional
symbols so far available for various technologies.
About 50 different forms and variations have been agreed
for HUDs, Hudsights and other weapon-aiming systems,
eg simple cross or cross/ring reticles, range rings that
unwind as range closes, and various aiming lines, wing bars
and arrow or triangular markers.
sync pulse/signal
symmetric aerofoil Wing profile whose mean line is
straight.
symmetric double-wedge Wing profile in form of sharpedged
parallelogram, used mainly for supersonic missiles
whose subsonic qualities are unimportant.
symmetric flight Both left/right wings equally loaded.
symmetric flutter Left/right symmetry in amplitude and
direction.
symmetric immersion Both flying-boat tip floats in
water equally (rare).
symmetric instrumentation Installation of experimental
sensing equipment (such as pressure transducers) over the
entire surface of aircraft such that for each sensing head on
left half there is an exactly corresponding unit on right.
symmetric principal axis See principal axis of symmetry.
symmetric pull-out Pull-out from dive with wings level.
symmetric stall Stall with wings level, longitudinal axis
rotating within plane of symmetry.
symmetry check Measurements to corrresponding L/R
points from centreline.
Syname Syndicat National de la Mesure Electrique et
Electronique (F).
synchro Generalized term for bipolar a.c. synchronous
systems in which a master unit or sensor commands
identical response (eg angular position) by one or more
instruments or other receivers. An alternative to voltage
signalling by potentiometer and digital signalling by
encoder.
synchronization 1 Commanding all aircraft engines to
rotate at same speed.
2 Commanding automatic guns to fire at cyclic rate
forming exact fraction of multiple of blade-passing
frequency of propeller; not same as interrupter.
3 Process of adjusting timing (epoch), frequency and
phase of spread-spectrum receiver’s PN correlation to
match those of received signal.
4 Process of preadjusting outputs of two or more control
(eg FCS) channels to reduce dead-zone if operated together
or switchover transient if operated separately.
synchronized aerobatics Performed by two [possibly
more] sections of same aerobatic team; see synchro pair.
synchronous corridor Equatorial belt within which
synchronous satellite must remain (normally describing
small vertical figure-eights).
synchronous orbit See geostationary orbit.
synchronous satellite One whose rotation is synchronized
with that of Earth; also called geostationary.
synchronous sighting See tachymetric aiming.
synchro pair Two aircraft which perform synchronized
manoeuvres to entertain crowd while rest of team reposition.
synchrophasing Commanding all propellers of multiengine
aircraft to rotate in step with propeller of master
engine, with all blades instantaneously at same angular
positions.
synchropter Helicopter lifted by two or more rotors
whose blades intermesh (suggest colloq.).
synchroscope Instrument for giving visual indication of
synchronization, or lack of it, between two or more
frequencies or speeds.
syncom Synchronous communications (satellite).
sync pulse/signal Sync is generalized term for sychronization
between TV camera and receiver, or between any
raster-scan sensor and display or output, hence * is integral
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