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stick-shaker speed
force which shakes stick (2) (normally a large yoke)
rapidly through small angle in fore/aft plane.
stick-shaker speed SSS or S-cubed, really a misnomer as
system is triggered by AOA, not a particular speed.
stick spacing Linear distance on ground between
ordnance items dropped in a stick (3).
stick time Logged pilot time, esp. as PIC.
stick travel Total range of travel of stick in either fore/aft
or side-to-side direction, normally measured not as angle
but as linear distance.
stick travel per g See stick movement per g.
stiction See static friction.
stiffener Normally a strip or beam attached to sheet to
resist load normal to surface. An integral * is formed in
skin itself, usually as pressed channel parallel to relative
wind.
stiffening bead Integral stiffener (see above).
stiffness Ability of system to resist a prescribed deviation.
In structural member within elastic limit, ratio of
steady applied force to resulting displacement or ratio of
applied torque to resulting angular deflection. For many
dynamic parts such as servo-actuators there is static * and
dynamic *. Static * is stiffness characteristic exhibited in
steady-state condition, normally trying to approach
infinity (discounting compliance within actuator and
deflection of surrounding structure) up to stall thrust.
Dynamic * is an apparent value dependent on ability of
flow power of servo valve to hold output against
oscillating load, up to critical frequency (varying with
magnitude of applied load) at which servo contribution
becomes negligible to give a degraded ‘infinitefrequency
*’.
stiffness criterion Relationship between stiffness and
other properties of structure which when satisfied ensures
prevention of flutter or other type of instability or loss of
control (BS).
stiff nut Nut provided with means for gripping male
thread to provide sustained torque resisting rotation once
tightened.
stiff pavement One able to accept any input aircraft
bending moment; stiffness measure is tonnes vertical load
to produce 1 cm deflection under point of application.
stiff wing Fixed-wing, ie not helicopter (colloq.).
stilb Non-Si unit of luminance, sb = 10 4 cd/m 2 ; plural
stilbs, sb.
Stile Sensor technologies integrated laboratory environment.
Stiletto Becoming generalized term for anti-radar D/F
and passive-ranging systems.
stiletto criterion Basic design case for passenger floors:
intensity of * heel loading of 100 kg/cm 2 , or over 100 times
limit for distributed heavy cargo.
stiletto weld One whose cross-section resembles
exclamation mark without stop.
stillage A specific meaning in aerospace is small wheeled
dolly for ground movement of external store, eg bomb.
Usual meaning is static warehouse storage.
still-air range Not a normal performance or flight
manual figure; in general a vague estimate of distance
under ideal still-air cruise conditions aircraft could fly
without air refuelling, ignoring ATC constraints, reserves
or any other factor. Unlike ferry range, usually assumes
some (occasionally maximum) payload.
stilling chamber Large volume in which fluid flow eddies
Stobal
and gross turbulence are brought to rest; generally
synonymous with settling chamber.
ST-IN Straight in.
Stinfo Scientific and technical information (data
management).
sting 1 Long cantilever tube projecting upstream in
tunnel to which model is attached with minimum interference
from mount.
2 Long cantilever tube projecting directly ahead of nose
of aircraft to carry instrumentation with minimum interference
from mount or following aircraft; also called
probe, instrumentation boom.
sting hook Normal form of arrester hook in form of
single strong tube (term introduced WW2 to distinguish
from A-frame).
Stings Stellar-inertial guidance system.
sting switch Activated by springy rod projecting below
RPV (or other aircraft), triggered on landing.
Stir 1 Surveillance target-indicating radar.
2 Separate tracking and illuminating radar[s].
Stirs Strapdown inertial reference system.
Stirling cycle Heat-engine cycle in which heat is added
at CV followed by isothermal expansion with heat
addition, heat is then rejected at CV followed by
isothermal compression with heat rejection; very efficient,
esp. with regenerator, but mechanical problems (Philips
use patented Rollsock to seal reciprocating parts). So far
used in aerospace mainly for space power generation or
cryogenic cooling.
STIS 1 Stabilized thermal-imaging sight [S adds
system].
2 Space telescope imaging spectrograph.
STIU Satellite telephone [or telecoms] intermediate
unit.
STLCS Simulation training life-cycle support.
STK Satellite toolkit, for software analysis.
STLO 1 Science and technology (or scientific and technical)
liaison office.
2 Simulation and Training Liaison Officer (RAF).
STM 1 Short-term memory.
2 Supersonic tactical missile.
3 Significant technical milestone(s).
4 Storm.
5 Serial transition module.
STMP Special Traffic Management Program (NAS).
STN, Stn Station.
STNA Service Technique de la Navigation Aérienne
(F).
STLCS Simulation training life-cycle support.
Stn No Stanton number (or St).
STNPA Système technique de neutralization des pirates
de l’air (F).
STNR Stationary.
STO 1 Short take-off.
2 System test objective.
3 Station telecom officer.
4 Council (Soviet) for labour and defence (USSR).
5 Science and technology objective.
6 Signature technology office (USAF).
7 Space tasking order.
8 Survive to operate (RAF Regiment).
S/TO Search/track operator.
STOAL Short takeoff and arrested landing.
Stobal Short takeoff but arrested landing.
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