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strut skin
strut skin Load-bearing additional skin, eg bonded
reinforcement.
STRV Space technology research vehicle.
STS 1 Space transportation system; usually means
Shuttle.
2 Space Tourism Society.
3 Stockpile to target sequence.
4 Stable time subfield.
5 Status.
6 Support and test station.
7 SAR (2) transit stripmap (radar mode).
8 Sensor to shooter (usually S2S).
sts Stones (non-SI unit of weight).
STSA Short-term strategic aircraft (UK).
STSC Sequentially triggered shaped charge [=BWA].
STSMT Service Technique des Systèmes de Missiles
Tactiques (F).
STSP Solar Terrestrial Science Program[me]
(NASA/ESA).
STSS Space tracking and surveillance system [formerly
SBIRS-Low].
STSSS ST3S.
STST 1 Strategic transportable satellite terminal.
2 Sensor-to-shooter time.
STT 1 Solution-treatment temperature.
2 Single-target track[ing].
STTA Service Technique des Télécommunications de
l’Air (F).
STTE 1 Special-to-type test equipment.
2 Alternative to STTEA.
STTEA Service Technique des Télécommunications et
des Equipements de l’Aéronautique (F).
STTEM Final tactical technical economical requirement,
follows PTTEM and leads to series production
(Sweden).
ST3S Service Technique des Systèmes Stratégiques et
Spatiaux (F).
STTI Single-target track and identification.
STU 1 Service trials unit (UK).
2 Sensor transmitter unit.
3 Satellite terminal unit.
4 Secure terminal, or telephone, unit.
5 Service transport unit.
stub 1 Portion of transmission line up to ¼-wavelength
long connected in shunt with dipole feeder to match impedances.
In particular the link between a data bus and a
terminal.
2 Short straight exhaust stack carrying gas from one
piston-engine cylinder direct to atmosphere just clear of
cowl or any downstream structure.
3 Short projection from aircraft, though sponson has its
own term.
stub antenna/aerial Stub (1), usually for DME, IFF and
beacon transponders.
stub exhaust See stub (2).
stub float See sponson.
stub plane Short length of wing projecting from fuselage
or hull to which main wings and/or main landing gear are
attached (BS). See stub wing.
stub power Net power available for propulsion.
stub runway Short section of runway projecting on far
side of an intersection which may be specifically designated
for STOL takeoffs which avoid all conflicts with CTOLS
on ground and in air. Not normally used for landings.
Suave
stub shaft 1 Projects from driving or driven item just far
enough for gearwheel and bearing.
2 Short shaft running in its own bearings with bevel drive
to an accessory [demanding longitudinal location] driven
by splines [permitting axial movement by driver].
3 Short shaft attached to the end of another [e.g., to the
face of a rotor disc] to enable it to run in a bearing.
stub thrust Net thrust available for propulsion.
stub wing Short aerofoil projecting approximately horizontally
from fuselage serving either as a structural bracing
member (eg linking lift struts and main gears) or as a beam
supporting external stores racks or other loads.
stub-wing stabilizer See sponson.
stud 1 Headless bolt threaded at both ends but not in midportion
used for attaching items to threaded hole in casting
or forging.
2 Projecting pin used as fulcrum, pivot, locating dowel or
for other purpose.
3 Projecting push-button human interface.
student pilot Person authorized and licensed to receive
flying instruction from rated flight instructor but who has
not yet attained any licence.
study Formal investigation, with or without research or
any kind of testing, of possible solutions to a stated future
requirement; hence * phase, * program, * contract.
stuffed Large component, eg wing panel or section of
fuselage, manufactured complete with internal systems and
equipment. In case of transport fuselage, not necessarily
furnished. In case of nacelle, contains equipped engine.
Stuka Dive bomber (G).
stunting Performing aerobatics (colloq., becoming obs.).
S-turn Flight manoeuvre in form of S in horizontal plane,
often carried out across road, railway, fence or similar axis.
STV 1 Structural, or systems, or supersonic, or separation,
test vehicle.
2 Satellite transfer vehicle.
STVA Self-tuning vibration analyser.
STVF System test and validation facility.
STVS Small-tower voice switch.
STW Special-to-weapon equipment, eg in WAS.
STWA Short(er) trailing-wire antenna.
STW&ARS Satellite threat warning and attack reporting
system (USAF).
STWL Stopway lights.
S2AT See SSAT second definition.
S2S Sensor to shooter.
STX Start of text.
STY Standby.
styrene Liquid hydrocarbon (C 6 H 5 CH:CH 2 ) polymerised
into polystyrene for use as basis of important resins, lowdensity
foams (expanded polystyrene) and many other
products.
Styrofoam Most widely used of the styrene-based foams,
used as sandwich structure filler.
SU 1 Signal[s] unit.
2 Submersible unit (sonar).
3 Servicing unit.
4 Foreign trade association [FIN-00101 Helsinki]
(Finland).
su Spin-up of wheels on touchdown, hence K su .
SUA Special-use airspace.
SUAV Small, or strategic, unmanned [or unit] air vehicle;
E adds experiement.
Suave 1 Small UAV engine.
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