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thrust horsepower
only in highly supersonic aircraft, in which area of
propelling nozzle exceeds that of engine.
thrust horsepower Seldom-used measure attempting to
determine power imparted to aircraft. For propeller
aircraft normally engine bhp or shp multiplied by
propeller efficiency (in case of turboprop plus a variable
component due to exhaust thrust). For jet engines, basically
thrust actually imparted to aircraft multiplied by
TAS, keeping units compatible. See equivalent horsepower.
thrust lever Jet-engine throttle, or power lever.
thrust line Thrust axis.
thrust loading W/F, total mass (in this case, weight) of
jet-propelled vehicle divided by aggregate thrust, usually
calculated for SLS-TO condition; units lb/kN =
224.8 lb/lb st, reciprocal 0.004448; 1 lb/lb st = 102.04 kg
kN -1 , reciprocal 0.0098.
thrust meter Instrument for measuring thrust, more
commonly of jet engine.
thrust power Appears always to be synonymous with
thrust horsepower.
thrust rating computer Central element in auto power
management system (ATS).
thrust rating panel AFCS cockpit display of limiting and
target values of engine parameters, and selectors for operating
mode (climb, cruise, MCT or TO/GA) or FTO
temperature(s).
thrust reverser See reverser.
thrust section Portion of vehicle, esp. slender rocket,
containing propulsion.
thrust specific fuel consumption See specific fuel
consumption.
thrust spoiler Pilot-controlled spoiler which when actuated
diverts jet from jet engine (esp. from turbofan core)
to reduce thrust close to zero. Lighter and simpler than a
reverser and merely eliminates possibly embarrassing
idling thrust.
thrust structure In large ballistic vehicle propelled by
multiple rocket chambers, structure which transmits
thrust from all chambers and diffuses it into airframe.
Normally large tubular truss structure at rear but can
include side structures for laterally attached motors, eg
SRBs.
thrust terminator Any quick-acting device for terminating
thrust of solid rocket motor, including blow-off
ports, nozzle ejection and inert-liquid injection into case.
thrust time lag Time from abrupt throttle movement to
reach stabilized thrust or power.
thrust-vectoring Control of vehicle trajectory by
rotating thrust line, esp. that of rocket; may involve
gimballed chamber, rotation of chamber about skewed
axis, inert-liquid injection at nozzle-skirt periphery, jet
tabs, spoilers, refractory vanes and other methods; abb.
TVC.
thrust-weight ratio Basic measure of combat aeroplane
performance: thrust (normally SLS-TO) divided by total
mass of aircraft.
thrust wire Diagonal bracing wire transmitting airship
propulsion thrust to envelope.
THRUT Throughout.
THS Tailplane, horizontal stabilizer [a tautological
usage].
THSA Trimmable horizontal-stabilizer actuator.
THSD Thousand[s].
TIC
THT Transient heat transfer.
THUM, Thum Meteorological readings of temperature
and humidity, hence * flight.
thumb-down Pilot’s visual confirmation of “switches
off.”
thumbprint Common meaning is aircraft T/W (thrust:
weight ratio) plotted against W/S (wing loading).
thumbstick Pilot input controller, eg for RPV or antitank
missile, in form of miniature stick operated by
thumb, typically attached to pistol grip and with * pivots
between vertical thumb and operator.
thumb up Pilot’s visual confirmation of “contact”.
Thump Meteorological readings of temperature,
humidity and pressure.
thunderstorm effect Error, possibly approaching 180°,
of ADF in vicinity of thunderstorm; needle may point to
nearby Cb or flick over, giving false indication of station
passage.
thyratron Gas-discharge triode used as relay, switch or
sawtooth generator.
thyristor Multilayer semiconductor device also called
Si-controlled rectifier; bistable, in one state highimpedance
in both directions, in other high-impedance in
one direction only.
THz Terahertz.
TI 1 Target indicator.
2 Thermal imager, or infra-red.
3 Training [or tactics] instructor.
4 Trial installation.
5 Thermal index.
6 Tertiary initiation (NW).
Ti Titanium; hence such alloys as Ti3Al2.5V, Ti6Al4V,
Ti6Al2Sn4Zr2Mo and Ti10V2Fe3Al.
t i 1 In gust analysis, the fraction of time spent in mission
segment i.
2 Thickness of an individual ply in a laminate.
TIA 1 Type inspection [and] authorization; allows FAA
to fly new aircraft.
2 Telephone interface adaptor card (TRV).
3 Telecommunications Industry Association (US).
4 Travel Industry Association of America.
5 Traffic information area.
TIACA The International Air Cargo Association
TIAD Tactical internet for air defence.
TiAl General symbol for titanium aluminides.
TIALD Thermal imaging airborne laser designator.
ti-aluminides Alloys of titanium and aluminium.
TIAS 1 Target identification and acquisition system
(ARMs).
2 True indicated airspeed.
TIB Technical Intelligence Bureau (former UK government
department, still a title in many countries).
TIBA Traffic information broadcast by aircraft.
Tibs, TIBS 1 Tactical information broadcast service
(USAF).
2 Telephone information briefing service.
TiB 2 Titanium boride.
TIC 1 Technical information centre.
2 Tantalum integrated circuit.
3 Target-insertion controller.
4 Total inventory count.
5 Transport & Infrastructure Committee (US House of
Reps.).
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