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GASC Ground Air Support Command (USAAF).
gas cap Gas immediately in front of hypersonic body in
atmosphere; compressed and heated, and if speed is sufficiently
high becomes incandescent.
Gasco 1 General-Aviation Safety Council [formed 1965
as GAS Committee, office, Rochester Airport, ME5 9SD]
(UK).
2 Ground Air Support Command (GASC was
preferred).
gascolator Filter fitted at lowest point of fuel system
[archaic US usage].
gas constant Constant factor R in equation of state for
perfect gas; kJ/kg K = 185.863 ft-lbf/lb °R; 8,314.34
J/kmol/K for particular gas; specific ** r = R/m where m
is molecular weight (see Boltzmann).
gas dynamics Study of gases under high velocity,
temperature, ionisation and other extreme conditions
prohibiting compliance with aerodynamic laws.
gaseous electronics Study of conduction of electricity
through gases, involving Townsend, glow and arc
discharges, and collision phenomena on atomic scale.
gaseous fuels Those stored in aircraft in gaseous form,
GH 2 being possible example (see Blaugas).
gaseous rocket Bipropellant or monopropellant rocket
utilising gaseous fuel and/or oxidiser.
GASF General Aviation Strategy Forum [being formed
2006] (Europe).
gas film Boundary layer on inner surface of combustion
chamber.
gas generator 1 Device for producing gases, hot or cold,
under pressure. In some tip-drive helicopters * comprised
gas-turbine core engines.
2 Gas-turbine core engine, eg turbofan minus LP
turbine and fan or turboprop minus LP turbine, gearbox
and propeller.
3 Major component supplying working fluid for
turbopump of liquid rocket engine.
gash Surplus, or pilfered (RAF, WW2).
gas hood Cowl or ports in outer cover of airship through
which gas can escape from inside hull.
gasifier Machine for producing flow of hot gas,
normally by combustion of fuel compressed by mechanism
extracting energy from flow; free-piston and other
systems but not gas turbine.
Gasil General-aviation safety information leaflet
[published quarterly by CAA] (UK).
gas laser One in which lasing medium is gaseous, eg
HeNe, CO 2 , Ar.
gas laws Thermodynamic laws applying to perfect gases:
Boyle-Mariotte, Charles, Dalton, equation of state. Also
called perfect or ideal **.
gas main Fabric hose running length of airship and
having branches to gas bags for inflation.
gas misalignment See jet misalignment.
gas motor Mechanical drive system energised by highpressure
gas from combustion of solid fuel, usually
single-shot.
gas oil Residual hydrocarbon fuel left after distillation
of gasolines and kerosenes from particular petroleum
fraction. Can yield diesel oil and, by cracking, gasolines.
gasoline Blends of hydrocarbon liquids, almost all
petroleum products boiling at 32°/220°C, used as piston
engine fuel. See octane number, petrol.
gas-operated Automatic weapon in which initial reargap-filler
gap-filler Radar used to supplement long-range surveillance
radar in area where coverage is inadequate.
gaping Discontinuity of skin profile caused by distortion
or deflection of landing-gear doors, access doors
and other separate panels intended to lie flush.
gapless ice guard 1 Fitted within intake mouth; used in
conjunction with automatic alternative inlet.
GAPP 1 Geometric/arithmetic parallel processor, or
processing.
2 Ground-accident prevention programme.
gapped ice guard Mounted forward of air intake to
provide a gap which does not ice up.
gapping Gap [increased clearance, intended or otherwise]
between TE of compressor rotor blades and LE of
next stator.
GAPS Generic acoustic processing system (DSTL).
gap-squaring shears Tool used for squaring and cutting
sheet metal; similar to squaring shears but able to slit long
sheet.
GAPU Ground auxiliary power unit.
GAR 1 Ground abort rate.
2 Geopotential altitude range.
GARA General Aviation Revitalisation Act, passed by
US Congress 1994 to limit manufacturers’ product
liability, especially for aircraft over 18 years old.
garbage 1 Miscellaneous hardware in orbit or deep
space; usually material ejected or broken away from
launch vehicle or satellite.
2 EDP (1) software or program which has been
degraded or in any other way rendered imperfect or unreliable,
or output therefrom.
garbling Indecipherable responses from two aircraft
both at exactly same slant range of about 4 km (corresponding
to 20.3 μs pulse interval) to SSR interrogation;
caused by fact both sets of reply pulse trains are synchronised
and superimposed (see degarbling).
garboard strake That section of plating on a seaplane
hull which extends fore and aft and is adjacent to the keel.
GARC Groupe Aérien Régionale de Chasse (F).
GARD General address reading device.
gardening Aerial minelaying (RAF code name, WW2).
Gardian General area-defense integrated anti-missile
laser.
GAR/I Ground acquisition receiver/interrogator.
GARP Global Atmospheric Research Programme.
GARS Gyrocompassing attitude reference system.
Garteur Group for Aeronautical Research and
Technology in Europe.
GAS Global-positioning adaptive-antenna system.
gas bag Flexible gas container of rigid airship; also
known as gas cell.
gas-bag alarm Indicates when predetermined gas-bag
pressure has been reached.
gas-bag net Mesh of cordage or wire to retain bag in
position.
gas-bag wiring Mesh of circumferential and longitudinal
wiring enclosing each bag to take pressure and transmit
lift.
gas bearing Bearing for rotating assembly, usually highspeed,
in which all forces are reacted by dynamic forces
generated in contained volume of dry filtered gas, often
He or N.
gas bleedoff Bleeding-off of hot combustion gas from
rocket engine for pressurizing or driving turbomachinery.
gas-operated
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