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guidance system
guidance system Complete system providing guidance
signals to flight-control system which steers vehicle.
guide ailerons Small wing-tip ailerons providing normal
feel on aircraft with plug-type spoiler ailerons.
guided bomb Free-fall missile with guidance, esp. modified
bomb.
guided missile Vehicle able to deliver warhead to target;
normally not including those travelling over land surface
or entirely through water (torpedo) but including all with
some form of aerial trajectory.
guided weapon Guided missile (UK).
guide rope See drag rope.
guide-surface canopy Any of several families of parachute
deployed from pack but able to be steered through
air with translational motion.
guide vane 1 See stator blade.
2 Radial aerofoil struts at gas-turbine inlet designed to
add or reduce swirl to airflow.
Guidonia Large aeronautical research centre formerly
(pre-1944) run by Italian defence ministry.
Guinea Pig Club Members of Allied air forces in WW2
who had been critically burnt or injured and operated on
semi-experimentally.
GULF, Gulf Graphical user interface load-control
facility.
gull wing One having pronounced dihedral from root to
c15–20% semi-span, then little dihedral or even anhedral
to tip.
gull-wing canopy In left/right halves, opened along
centreline.
gull-wing door One having pronounced curvature,
concave on outer face, hinged parallel to aircraft
longitudinal axis.
gully Deep axial channel, eg. between two separated
engines in fuselage of twin-jet aircraft.
gulp Irresversible consumption of lubricating oil.
gum General term for viscous residues formed in gasolines
(petrols) and to lesser extent other hydrocarbon
fuels, mainly by slow oxidation.
gum inhibitor Now called anti-oxidant additive.
Gumo, GUMO Main and central directorates, each with
a number (R, MoD).
Gump Gas, undercarriage, mixture, propeller(s) (US
arch.).
gun 1 Good general term for airborne rifled weapons of
all calibres, including recoilless installations; no clear definition
at what low muzzle velocity * becomes projector.
2 Piston engine throttle; hence to cut * = to close
throttle, and to * engine = to apply full power (colloq.,
suggest arch.).
gunbore line Projected axis of bore.
gun cross HUD symbol indicating gun is armed, ready
to fire.
gun gas Emitted from muzzle, mix of initially incandescent
gases from propellant deficient in unburned oxygen
which if ingested by engine suddenly alters operating
conditions.
gun jump Angle between gunbore line at firing and
projectile trajectory as it leaves muzzle.
Gunk Registered commercial solvent for oils and
greases.
gunlaying radar Early AI radar with mode for assisting
attack with fixed guns on target seen only on display.
gustiness factor
Gunn oscillator Major family of GaAs diodes generating
microwave outputs on application of small bias voltage.
gun pack Quickly replaceable unit comprising one or
more fixed guns (sometimes with barrels remaining
installed in aircraft), feed systems and ammunition tanks,
either in streamlined pod or contained within aircraft.
gun perfection coefficient –––––
T-m
where m is mass of
60-M
projectile, M mass of gun and T shots per minute.
gunship 1 Specially designed helicopter with slim twoseat
fuselage, extensive protection and wide range of
armament for roles in land warfare.
2 Large transport aircraft equipped with night sensors
and guns for use against poorly defended ground targets.
gunsight line LOS to aiming point through gunsight
fixed optics.
gun time per engagement Usually firing duration in
seconds, aggregate of separate bursts, against one aerial
target.
gun-type weapon Nuclear weapon triggered by firing
together at maximum velocity two or more subcritical
fissile masses.
gunwales Pronounced gunnels, the upper edge of the
sides of a marine-aircraft hull or float [with a rounded top,
hardly applicable].
Guppy Aircraft with grossly swollen or bulged fuselage,
eg, for conveyance of space-launcher stages and widebody
components (colloq.).
Gusem Generic unified systems engineering metamodel.
gusset Small flat member used to reinforce joints and
angles.
gust 1 Sudden increase in velocity of horizontal wind
(see gustiness factor).
2 Suddenly encountered region of rising or falling air,
causing moving aerodyne to experience sudden increase
or decrease in angle of attack, = gust velocity u airspeed
v. Vertical gust can theoretically be sharp-edged (instantaneous
change from zero to maximum u) but normal
design/airworthiness based on l-cosine (gradual) gust
curve to which gust-alleviation factor applied.
gust alleviation Dynamic system for reducing effect of
vertical gust on aeroplane (rarely, other aircraft) (see
active ailerons, Softride).
gust-alleviation factor As aeroplane encounters gust it
pitches (depending on wing/tail or foreplane geometry)
and wing does not generate full extra lift until it has
travelled several chord lengths into gust, both of which
reduce sudden structure load below instantaneous
encounter, BCAR assumes *** 0.61, ie assumptions are
based on 61% of true sharp-edged gust.
gust curve Assumed plot of gust (invariably 2) velocity
relative to surrounding air mass against horizontal
distance from undisturbed air to position of peak u.
gust envelope Basic aircraft design plot, vertical
axis being structural load factor (1) and horizontal axis
airspeed; normal boundaries are positive-stall curve, peak
positive gust (normal non-SI = 50 ft/s) to Vc, line to meet
gust of half this strength ± 25 ft/s at VD, then vertical VD
to negative half-strength gust, line to – 50 ft/s gust at Vc,
and straight line at this negative gust value to meet positive
stall at point less than 1 g. Recently new boundaries
have been established at VB at 66ft/s. Increasingly now
called flight envelope.
gustiness factor Measure of gust (1), = difference
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