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triangulation station
triangulation station Point on land whose position is
determined by triangulation; also called trig point.
triboelectrification Electricity produced by frictional
processes.
tribology Study of solid surfaces sliding over one
another, with or without interposed fluid.
tribometer Instrument for measuring sliding friction,
usually small-scale between smooth surfaces (ie not of
runway).
tri-camera photography Simultaneous exposures by fan
of three overlapping reconnaissance cameras.
trichlorethylene Common solvent and cleaner, CH 2
HCl 4 .
trichromatic Three-colour, eg TV or electronic display.
tricycle Though nearly all aeroplane landing gears
support at three points (ignoring different number of
wheels at each point) this adjective means use of nosewheel
instead of tailwheel. Becoming redundant, adj.
today being needed only to distinguish tailwheel-type
aircraft.
Tridop CW Doppler trajectory measurement using
three fixed receivers.
tri-ethyl borane TEB, volatile pyrophoric [spontaneously
igniting on contact with air] ignition liquid.
Tri-fluid fuel Rocket propellant comprising liquid
hydrogen peroxide, decomposed peroxide and JP-7.
Trifom Trilateral fibre-optic missile (France/Germany/
Italy).
triform Structural member, usually an extruded section,
providing attachment faces along three planes passing
through same line, e.g. a broad-arrow or a Y shape.
Trigatron Pulse modulator having DC-charged hemispherical
electrode discharged by pulse from
hemispherical trigger in gas-filled envelope.
tri-gear Fitted with nosewheel.
trigger 1 Pulse used in electronic circuits to start or stop
an operation.
2 To initiate action using pulse of EM energy, eg
leading edge of first pulse in SSR pulse train begins * of
transponder.
3 Sharp strip, usually on leading edge, to initiate stall.
triggering transformer Extra-high-voltage transformer
connected in series with high-energy igniter to ionise gap
and allow triggering spark to occur.
trigger motor Linear actuator in pressure circuit (usually
pneumatic), or driven electromagnetically, to fire gun.
trihedral Having three plane faces meeting at junction of
three interior angles [e.g., in corner reflector].
trijet Aeroplane propelled by three jet engines.
trike 1 Microlight using trike unit.
2 Trike unit.
trike unit Three-wheel chassis, usually with engine and
seat(s), forming basic body and landing gear of microlight
or ULA.
trillion 10 12 = 10,000,000,000,000.
Trim 1 Trail/roads interdiction multisensor.
2 Time-related instruction management.
trim 1 Basic measure of any residual moments about
aircraft c.g. in hands-off flight.
2 Condition in which sum of all such moments is zero.
3 Condition in which aircraft is in static balance in pitch
(BSI).
4 To adjust trimmers or other devices to obtain desired
trimming tanks
hands-off aircraft attitude (according to BSI, in pitch
only).
5 Angle between longitudinal axis (OX) and local horizontal,
esp. of airship, marine aircraft or seaplane float on
water.
6 To make fine adjustment to value of any variable, eg
velocity at cutoff of ICBM, fuel flow to engine or capacitance
deposited on circuit.
7 To make fine adjustments to flap, LG door, external
access panel or other part of aircraft surface so that when
closed there are no surface discontinuities.
trim aid device Patented add-on to eliminate need for
rudder to counter torque and gyro effects.
trim air Hot bleed air added downstream of ECS pack(s)
to achieve desired cabin air temperature.
trim angle Trim (5), positive when bow is higher than
stern.
trim cord Short length of cord doped above or below
trailing edge of control surface of simple aircraft to adjust
trim.
trim curve Plot of elevator or tailplane angle (ηT)
against airspeed or Mach for each c.g. position, altitude
etc.
trim die Die which trims to final dimensions.
trim drag 1 Sustained increment of induced drag caused
by need to increase wing lift to counter download on
tailplane, plus the induced drag of the tailplane itself, plus
component parallel to downwash on tailplane.
2 Sustained increment of drag caused by need to deflect
pivoted surface continuously in order to achieve required
trim, eg to deflect elevons or tailplane up to counteract
rearward shift in CP as aeroplane accelerates to supersonic
cruise speed. Normally eliminated in SST by
pumping fuel aft to shift c.g.
trimetric drawing 3-D perspective.
trimetrogon Reconnaissance camera installation of
three cameras in which one is vertical and others take high
obliques at 90° to line of flight at inclination of 60° from
vertical.
trim for takeoff Automatic or manual trimming of
flight-control system to correct settings for takeoff; abb.
TFT.
trimmed 1 In correct trim; also called trimmed-out.
2 The * position of a flight-control surface or other
inceptor may not always be at the neutral or zero position.
trimmer Trimming system about any axis (as plural,
about all axes); normally trim tab(s).
trimmeron Small auxiliary irreversible surface used for
roll trim.
trimming moment Moment about reference point,
usually c.g., exerted by trimming system or by seaplane
float or hull when held in water at particular fixed trim
angle.
trimming strip Strip of metal (occasionally length of
cord or wire) attached to trailing edge of control surface
and adjustable on ground to achieve desired trim.
trimming system Flight-control subsystem through
which pilot inputs bias controls about all axes to obtain
desired trim; in most cases ** operates via hinged trim tabs
but in supersonic fighters inputs are separate irreversible
actuators driving into surface power units and in simple
lightplanes often a spring-loading device in cockpit.
trimming tab See trim tab.
trimming tanks Fuel tanks (occasionally for other
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