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2 Last aircraft in such a line.
3 Rear gunner in tail of large aircraft (1935–50).
taileron Single-piece horizontal tail surface, one of two
forming tailplane whose left/right halves can operate in
unison (as tailplane commanding pitch) or differentially
(as ailerons commanding roll). Term preferable to
ailevator or rolling tailplane. Elevon differs in that it is
hinged to wing. US term stabilator is ambiguous and can
mean * or slab tailplane.
tailets Small fixed fins on underside of tailplane near
each tip.
tailfeathers Free-floating flaps forming periphery of
supersonic airbreathing propulsive nozzle, usually as
outer boundary of large secondary nozzle. These take up
slipstreaming angular positions aligned with streamlines.
tail fin Fixed stabilizing fin at rear, ‘tail’ normally being
redundant.
tail-first Aerodyne configuration in which the only
auxiliary horizontal surface is ahead of the wing,
commonly called a foreplane or canard.
tail float Float supporting tail of float seaplane (now
arch.).
tail group Complete tail (2), considered as design task or
as element of total aircraft mass.
tail guy Secures tail of moored airship, often to tail drag.
tailheaviness Condition in which aircraft rotates noseup
unless prevented.
tailhook 1 CTOL by carrier aircraft.
2 Naval pilot (colloq.).
tail kit Prepacked item[s] to convert iron bomb into
precision air/ground missile.
tail length Tailplane moment arm.
tailless aircraft Normally applied to aeroplanes and
gliders only and usually meaning that there is no separate
horizontal stabilizing or control surface, though there
may be a vertical tail (2). In extreme case there is no tail
surface, and (esp. if fuselage vestigial or absent) this is
more often called flying-wing aircraft).
tail load Vertical up or down thrust acting on tailplane.
tail logo Bold logo of operator displayed on tail; hence
** light, also valuable as anti-collision beacon.
tail number See serial (2).
Tailored Air Group An embarked airpower package
assembled from suitably configured air assets from any or
all of the armed forces to suit a specific operation or
campaign (UK).
tailored fuel Synthesized to meet specific operational
specification.
tail parachute Parachute attached to tail, normally for
anti-spin or anti-superstall purpose. Not used as braking
parachute.
tailpipe Exhaust pipe of turboprop or turboshaft;
according to some, piston engine exhaust pipe downstream
of collector or manifold.
tailplane 1 More or less horizontal aerofoil at tail of
aerodyne (invariably fixed-wing) providing stability in
pitch; fixed or adjustable only for trim, and carrying
elevators (US = stabilizer).
2 Aerofoil pivoted at tail about horizontal axis and
driven directly by pilot of fixed-wing aerodyne or rotorcraft
as primary flight control in pitch in translational
flight; forms complete surface without separate elevators
(US = stabilizer).
tailplane tank Fuel tank, invariably integral, in horitagging
tagging Attaching unmissable warning notice during
maintenance to point out, e.g., that item has been
switched off or disabled.
Tags Technology for automated generation of systems.
Tagwes Target weapons effects simulation, or simulator,
or system[s].
TAH Transfer and hold.
TA/H Twin altitude/height.
TAI 1 Total active inventory.
2 Thermal anti-icing.
TAIA Taiwan Aerospace Industry Association [office,
Taipei] (Taiwan).
TAIC Transport Accident Investigation Commission
(NZ).
tail 1 Rear part of aircraft, where applicable.
2 Assembly of aerofoils whose main purpose is stability
and control, normally located at rear of aerodyne or
airship.
3 Trailing luminous area behind blip of moving target.
4 Normal verb meaning in air-intercept shadowing
from astern.
tail arm The moment arm of a horizontal or vertical (or
inclined) tail surface. There are several definitions:
1 The diatance parallel to the longtitudinal axis between
the aircraft centre of gravity and a nominated point on the
specified tail surface.
2 The distance between the c.g. and the centroid of the
nominated tail surface.
3 Becomng the usual meaning, the distance parallel to
the longitudinal axis between the intersection of the wing
¼-chord line and the spanwise location of the mean aerodynamic
chord and the corresponding ¼-chord point on
the nominated tail surface.
tail bearing The rearmost bearing of a gas-turbine mainshaft
[suggest not common use].
tail boom Tubular cantilever(s) carrying tail (2) attached
either above short fuselage nacelle or as L/R pair to wings.
tail bumper Projecting or reinforced structure under tail
designed to withstand impacts and scraping on runway.
tail chase, tail chasing One aircraft closely following
another, elementary form of air-combat training [often
one word].
tail chute See tail parachute.
tailcone Conical fairing of rear of body, esp. downstream
of turbine disc in jetpipe.
tail damping power factor Numerically the product of
TDR [see next] and URVC.
tail damping ratio A [suggested limited] measure of antispin
quality based on side area under tailplane multiplied
by distance to c.g.
tail-down angle In an aircraft fitted with nosewheel
landing gear, the angle between the ground line and the
plane defined by the underside of the rearmost main
landing wheels and the underside at the tail; thus, the
angle of the longitudinal axis in a tailscrape test.
tail drag Restraining mass free to slide on ground to
which moored airship stern is attached.
taildragger Aircraft with tailwheel or tailskid (colloq.).
tailed delta Aircraft with delta wing and horizontal tail.
tail efficiency factor A multiplicator of elevator control
power equal to αδ F T c h (angle of attack, flap angle, thrust
coefficient and ground effect), symbol η.
tail-end Charlie 1 Formation of aircraft in single line,
each behind the other.
tailplane tank
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