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strap
strap Usual term for a doubler strip or plate added as a
modification at a place subject to high stress and possible
fatigue damage.
strapdown Generalized adjective for device mounted so
that its attitude changes with that of aircraft or spacecraft;
specif., one not gimballed about three axes.
strapdown INS Simplied INS using strapdown platform.
strapdown platform Platform for INS on which sensing
gyros and accelerometers are fastened without relative
motion; usually there are three mutually perpendicular
gyro/accelerometer units, and in some cases an element of
redundancy from a fourth mounted at 45° to all three
others.
strap-on boost Rocket boost motors attached around
sides of vehicle, jettisoned after burnout [suggest = wrapround].
strapping 1 Interconnection of resonant chambers of
cavity magnetron or related oscillator give one stable
preferred mode.
2 Calibration of storage tank so that measurement of
contents depth can be related to actual volume.
3 Metal or other straps, wire or other ties around
palletized, igloo or other loose cargo.
Strata Siimulated training research advanced testbed for
avionics.
Stratcom Strategic Command (USAF).
strategic Concerned with broad politico-military
objectives and enemy’s warmaking potential.
strategic aeromedical evacuation Airflift of patients out of
theatre of operations to main support area.
startegic air bridge Semi-permanent service by troopcarrier
aircraft between home base[s] and distant area of
operations.
strategic airlift In support of all arms between area
commands or between home state and overseas area.
strategic air transport According to DoD, one in accord
with strategic plan; according to NATO, movement
between theatres by scheduled service, special flight, air
logistic support or medevac.
strategic air warfare Air operations designed to effect
progressive destruction and disintegration of enemy’s
warmaking capacity (NATO; DoD is much longer
definition which adds nothing).
strategic attack Aerospace attack on selected vital targets
of enemy nation to destroy warmaking capacity or will to
fight.
strategic bomber Delivery-system aeroplane for strategic
attack.
Strategic Defense Initiative Plan by Reagan administration
to enhance US ability to conduct warfare in space, eg
by using direct-impact missiles or super-power lasers to
incapacitate satellites.
Strategic lateral offset provision[s] Dispensation on filed
flight plan allowing a pilot to displace laterally in order to
get out of wake turbulence.
strategic plan Plan for overall conduct of war.
Strategic Planning Team Focal point for development of
future NAS (FAA).
strategic psywar Actions designed to undermine enemy’s
will to fight.
strategic transport Aircraft for transport between
theatres.
strategic UAV UK term for UCAV.
strategic warning Notification that enemy-initiated
streamline
hostilities may be imminent. Hence ** lead-time, time
elapsing between ** receipt and beginning of hostilities.
May include two action periods, ** predecision time and
** postdecision time in which national commander takes a
decision to respond positively to **.
stratified-charge engine Piston engine in which mixture
strength is varied in controlled manner during induction
stroke, with minimum turbulence, if possible to leave
layered charge in cylinder with highest density near source
of ignition. Now especially important in RC (1) engines.
stratiform cloud Sheets in stable thin layers.
stratocumulus, Sc Layer of connected cloudlets at lowcloud
level often arranged in aligned rows.
stratopause Atmospheric layer at top of stratosphere
where inversion ceases at 270.65°K [though such accuracy
is pointless].
stratosphere Atmospheric region between tropopause
and stratopause within which temperature remains essentially
constant and then, at upper level, rises with altitude.
stratus Uniform layer of low (usually grey) cloud, well
clear of surface.
straw man Pilot of well below average competence.
straw qualities Possessed by aircraft safe enough to be
routinely flown by straw man.
stray 1 Naturally occurring EM signals, eg static.
2 Errant marker or TI put in wrong place.
STRC Strategic training route complex.
streak 1 Horizontal smear, usually white, following
moving image on TV or other raster display.
2 Long flame in airbreathing engine normally denoting
abnormal combustion at one point.
streak camera Family of cameras for ultrafast photography
in which changing scene is viewed through slit
perpendicular to main image variation and optics sweep
image along fixed arc of film. Basic type has rotating
mirror, normally projecting through array of biconvex
lenses.
streaking 1 Unwanted manifestation of streak (1).
2 Unwanted manifestation of streak (2) in gas turbine,
usually resulting in reduced life or damage to NGVs.
stream 1 To release parachute retarding horizontal
motion, eg braking parachute.
2 To dispense chaff as solid, at random intervals or as
bursts (DoD).
3 Jet stream (colloq.).
4 Shower of meteoroids with similar orbits and timing.
5 Closely-spaced procession of strategic night bombers
(RAF 1943–45).
streamer Anything that follows or indicates streamlines,
in particular windsock.
streamering 1 Visible brush discharge.
2 Unreefed parachute canopy opens but fails to deploy
fully; hence streamered.
stream function Basic parameter of 2-D non-divergent
fluid flow with value (symbol ψ) constant along each
streamline related to velocities along each axis by u =
d ψ/dy, v = d ψ/dx.
stream landing Landings by group of aircraft in quick
succession.
streamline Line marking path of particle of fluid in
homogenous flow; esp. in streamline flow; line whose
tangent is everywhere parallel to instantaneous velocity at
that point.
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