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single-pass heat-exchanger Each fluid passes once
through without turning.
single-pole electrical system The bonded airframe
provides the return path for the current.
single-regime engine One designed to operate always
under same conditions, eg jet VTOL.
single-rotation 1 Composed of one unit (propeller or
propfan), as distinct from two equal units rotating in
opposite directions.
2 Flap hinged about a single fixed axis well below the
wing, and thus moving along a circular arc.
single-row engine Radial engine with all cylinders in
same plane driving one crankpin.
single-shaft engine Gas turbine in which all compressor
stages are connected to the same turbine. There may be an
independent shaft linking a free turbine to a shaft output.
single-sideband Reduction of bandwidth by transmitting
only one sideband and suppressing other (and usually
carrier also); receiver heterodynes at original carrier
frequency.
single-sideband suppressed carrier Band of audiointelligence
frequencies translated to radio frequencies
with no distortion of signal.
single-sink flow Fluid flow capable of exact representaton
using a single sink.
Single Sky Wide range of measures intended to consolidate
Upper Airspace throughout Europe by end of
2004 (EU).
single-spar wing Wing in which primary flight loads are
borne by one spar (as distinct from a box), possibly made
with two booms on at least one edge or having U or
circular section. Does not preclude secondary spanwise
member(s) for trailing-edge surface loads.
single-spring flexure Tunnel balance in which model is
supported by single (usually vertical transverse) member
locally thinnned at one transverse point to serve as pivot
sensitive to forces or couples about that axis only.
single-stage compressor Compressor achieving total
overall pressure ratio in one operation, eg by centrifugal
impeller or single row of axial blades.
single-stage turbine Turbine having only one set of axial
rotor blades or inward radial vanes.
single-stage vehicle Aerospace vehicle (aircraft, RPV,
missile, rocket) with only one propulsion system. It is
hoped eventually to create a * to orbit, or to interplanetary
space.
single-surface rudder Normal leading edge back to spar
[near maximum thickness], aft of which skin is on centreline
with half-ribs on each side. Also called splitter-plate
rudder or tadpole rudder.
single-surface wing Wing having upper [lifting] surface
only, charactersistic of pre-1914 aeroplanes and many
hang gliders and microlights.
single-target track Traditional fighter radar tracking
mode, usually with phase-comparison monopulse.
single-tipping Sheath (1) made in one piece.
single-up Competition in which winner takes all.
single-wedge aerofoil Cross-section has sharp leading
edge, flat sides and blunt or square trailing edge, eg
vertical tail of X-15. Extremely inefficient at low speeds.
single-wheel gear Main landing gear of large aircraft
with one wheel on each shock strut.
single-wind construction Making an item, especially a
large section of airframe, from a single continuous highsimultaneous
range
simultaneous range Radio range which simultaneously
broadcasts voice messages.
SIN Significant-item number.
Sinaga Sindicato Nazionale Gente dell’Aria (I).
SINCGARS, Sincgars Single-channel ground and
airborne, or ground/air, radio subsystem; SIP adds
system-improvement programme and V adds vhf.
sine curve Obtained by plotting sine on linear axis,
graphically identical to plot of SHM.
sine wave Wave of SHM form, eg EM radiation.
sine-wave flight Repeated SHM in vertical plane,
especially spacecraft skipping in and out of sensible
atmosphere.
sine-wave spar Structural member whose web has a sinewave
profile.
S-ing Performing succession of S-turns.
single A single-engine aircraft, term normally used for
GA aeroplanes.
single-acting Actuator pushing in one direction only,
with spring return; push-push.
single-aisle aircraft Narrow-body, having twin or triple
seats on each side of one axial aisle.
single-axis autopilot One offering stability or control
about one aircraft axis only, eg pitch, roll or yaw.
single-axis head Homing head whose sensor scans only
in one plane.
single-base propellant Traditional term originating in
so-called smokeless powders based on either Nc or Ng
alone (see double-base).
single-bay Having only one set of interplane struts
joining wings of biplane on each side of centreline.
single-channel simplex Same frequency in both
directions.
single-configuration fleet Not only are all aircraft in
airline fleet of same type but all have same build-standard,
avionics, cockpit and furnishing.
single-crystal alloy Complete workpiece formed in piece
of metal grown as single crystal, possibly containing
occasional atomic imperfections but devoid of gross intercrystalline
joints and as far as possible with lattice
orientation selected to increase strength in direction of
greatest applied stress.
single curvature Curved only in one plane, as surface of
regular cylinder.
single-direction route Self-explanatory, usually highaltitude
IFR.
single-entry compressor Radial or centrifugal impeller
with vanes on one side only.
Single European Sky Overdue plan for unified ATC,
adopted by EC December 2002, still years from implementation.
single-expansion ramp nozzle One form of nonaxisymmetric
jet engine nozzle in which supersonic jet is
accelerated along sloping wall (expansive flow) on one
side only. Has attractions for SSTOVL.
single-face repair Repair to sandwich structure
involving core and one face only.
single-flare joint End of rigid pipe flared out but not
turned back on itself.
single-float seaplane Large central float and small stabilizing
floats outboard.
single ignition One coil of magneto, feeding one plug per
piston engine cylinder. Thus, there is no redundancy.
single-wind construction
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