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storm cell
storm cell Central region of most intense turbulence, indicated
in cockpit radar display by black hole or red colour.
Stormfest Stormscale operational research meteorological
fronts experimental systems test (FAA 1992).
Storms Stores management system.
storm scope Weather radar.
storm-warning radar See airborne weather radar.
Stosi Scientific, or science, technological, or technology,
and operational, or operating, support information.
stovepipe Ramjet (colloq.).
Stovie Pilot of Stovl aircraft (colloq.).
Stovl, STOVL Short take-off, vertical landing; common
operating mode of Harrier family and F-35B.
STOW Synthetic theatre of war.
Stow System for takeoff weight and c.g., also called
IWBS, with display readout driven by sensors on all
landing gears.
stowed-rotor aircraft Rotorcraft, normally helicopter in
vertical mode, whose lifting rotor(s) can be stopped and
retracted in wingborne cruising flight. Not yet achieved.
stow position Travelling or inoperative az/el attitude of
large radar or other steerable aerial, normally pointing to
zenith.
STP 1 Standard temperature and pressure.
2 Space-test Program (DoD).
3 Space Technology Program (Darpa).
4 Systems Technology Program (DoD).
5 Short-term planning.
6 Status test panel.
7 Sensor track processor.
8 Standard training package.
9 System-test package procedure.
10 Solar terrestrial probe[s], or physics.
STPAé Service Technique des Programmes
Aéronautiques (F).
STPD Standard temperature and pressure, dry.
STPE Service Technique des Poudres et Explosifs (F).
STR 1 Service trials report.
2 Sidetone ranging modulation; EW (spread-spectrum)
acquisition assistance technique.
3 Sustained turn rate (usually means maximum).
4 Software trouble report.
5 Systems technology radar.
6 Standard test rack.
7 Same type rating.
8 Sonar transmitter/receiver.
9 Satellite transceiver.
10 Solar terrestrial receiver.
STRA Simultaneous turnround actions.
straddle-mounted Mounted at front and rear [applies
particularly to multi-stage compressor].
Stradographe Runway friction measurer with braked or
toed-in wheels and EDP (1) for nine variables.
strafe To rake with fire, eg from automatic guns; spelt as
shown (not straff) and rhyming with chafe. US usage is in
favour of ‘straff’, rhyming with chaff, and ‘straffing’ is
becoming predominant.
straight Applied to fuel, lubricant, etc, = without additives.
straighteners Vanes, cascades, or, in tunnel, transverse
flat-plate honeycomb, to remove swirl or turbulence from
flow.
straight-flow Gas turbine of normal, ie not reverse-flow,
layout.
Strap, STRAP
straight-in approach In IFR, an instrument approach
wherein final approach is begun without a prior procedure
turn. In VFR, entry of traffic pattern by interception of
extended runway CL without executing any other portion
of traffic pattern (FAA).
straight leading edge Having no taper; likewise for trailing
edge.
straight-pass attack One using on-board weapon-aiming
system to hit point surface target without search or visual
acquisition, thus in straight run at highest speed at lo level.
straight roller bearing Not tapered, thus no axial load
expected.
straight-run Hydrocarbon distillate, eg from original
crude, representing all products separating out between
specified upper/lower temperature limits; not normally
used as aviation fuel.
straight spur gear Straight teeth parallel to shaft.
straight stall One performed with minimal yaw, using
rudder if necessary to hold heading.
straight-through duct Inlet duct to trijet centre engine in
which flow from inlet to nozzle is essentially straight, as
distinct from S-duct.
straight wing Of traditional planform, specif. not swept.
strain Deformation under stress expressed as a
percentage of an original dimension; length, area or
volume.
strained silicon Perfect lattices which permit electrons
either to move faster or to travel with less power.
strain energy Elastic energy recovered from body by
removing stress.
straingauge Device for transducing strain into electrical
signal, usually by extremely accurate measurement of
change of resistance of conductor.
strain hardening Increase in hardness and reduction in
ductility caused by strain, esp. by cold-working (eg rolling);
the only way to harden some wrought light alloys.
Introduces a strain exponent (expressed as n) into
stress/strain equations.
strain rate Strain per unit time, normally under uniform
stress and often synonymous with creep.
strain viewer Instrument giving pictorial strain pattern
using polarized light.
strake 1 Long but shallow surface normal to skin and
aligned with local airflow; extremely low-aspect-ratio fin.
2 Fin[s] mounted on upper part of underwing engine
pod, normal to surface, to generate vortex passing over
wing.
3 One row from stem to stern of single plates cladding
marine aircraft.
stranded conductor Electric cable containing numerous
conductive wires twisted together within single insulating
sheath.
Stranger Air-intercept code: unidentified target.
Normally ground/air message followed by bearing,
distance, altitude, in that order.
strangle General term meaning please switch off a particular
emitter (military usage).
Strangle Parrot Ground/air code: switch off IFF.
Strap, STRAP 1 Sonobuoy thinned random-array
project. Acoustic process or in aircraft correlates signals
from 15 to 20 buoys, four of which emit low-power signals
to fix precise position of each buoy.
2 Straight-through repeater antenna program, or performance.
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