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stage cost
two staging units; sometimes, for flight planning, one
point on route.
5 Various meanings in electronics, EDP (1) and other
disciplines.
stage cost Direct operating cost of flying one (mean, or
one specific) stage (4).
stage count Simple list of total number of stages of
blading in fan, compressors and turbines, thus GP7200 *
reads 1-5-9-2-6.
staged combustion Or * combustor, fuel is supplied to
groups of burners arranged in rings of different radius or
in axially spaced rings or radial arms, ignited successively.
staged crew Prepositioned at staging unit to take over
incoming flight.
stage flight One flight forming part of longer multi-stage
journey.
stage fuel Fuel burned in flying one stage (4); hence **
carpet, plot of variables for flight-planning purposes.
stage length Air-route distance between two staging
points; in commercial use normally synonymous with
sector distance.
stage sheet Completed for each stage of maintenance
listing all configuration changes and parts replaced.
stage time 1 Planned or actual time at which stage (1)
takes place.
2 Sector time.
Stagg Small turbine advanced gas-generator.
stagger 1 Distance measured parallel to aircraft longitudinal
axis between biplane lower-wing leading edge and
vertical projection on to lower-wing extended chord line
of upper-wing leading edge at same spanwise station
(UK). Negative when upper plane is aft of lower.
2 Acute angle measured in vertical plane parallel to
aircraft longitudinal axis between leading edges of lower
and upper planes at same spanwise location (US).
Negative when upper plane is aft of lower.
3 PRF variation by various means involving interleaving
trains separated by offset interval; alternative EW
technique to PRF jitter.
stagger angle 1 In a biplane, the acute angle in plane
parallel to aircraft longitudinal axis betwen line joining
points equidistant from centreline on upper and lower LE
(see stagger [1]) and local vertical.
2 In a rotor blade of a gas-turbine axial compressor or
turbine rotor, the angle between the principal chord at any
radius and [usually] the plane through the axis of rotation;
the chord line may be drawn as tangent to the LE/TE, or
even through the front of the aerofoil only.
stagger tuning Increasing pass-bandwidth of RF
receiver by tuning different output stages (one meaning of
stage [5]) slightly above or below central frequency.
stagger-wing Biplane of any make with negative stagger.
stagger wire Diagonal wire joining lower and upper
wings of biplane and lying approximately in plane parallel
to axis of symmetry. (US term; UK = incidence wire).
staging 1 Separation of one stage (1) from next.
2 Time at which * (1) is scheduled or actually occurs.
3 Flying by separate stages (4), with or without changes
of crew.
staging area Geographical area between mounting area
of exercise and objective, esp. for airborne or amphibious
operation.
staging base Landing and takeoff area with minimum
servicing, supply and shelter provided for temporary
stall
occupancy of military aircraft during course of movement
from one location to another (DoD).
staging point, unit Place or organization linking two
stages (4).
stagnant In fluid flow, locally at rest with respect to solid
containment. Avoided in most aerodynamics, and
especially in fuel flow in gas-turbine injectors.
stagnation line Locus joining stagnation points, eg
boundary between radial-wall jets under hovering VTOL.
stagnation point Point on surface of body in viscous fluid
flow (one facing upstream and one down) where fluid is at
rest with respect to body, flow in boundary layer on each
side of ** being in opposite directions.
stagnation pressure Pressure at stagnation point,
normally same as total head, total pressure or pitot
pressure, = sum of local atmospheric plus dynamic pressures.
stagnation region Region close to upstream stagnation
point.
stagnation stall 1 Several related afflictions of afterburning
turbofans normally occurring on afterburner
light-up at high altitude at modest airspeed, in most cases
with rapid pressure pulses (say, seven per second) in fan
duct causing oscillating stall of fan and then core engine.
2 In flight of aircraft, any stall that is not selfcorrecting.
stagnation streamline That which in any representaton
of 2D flow passes through front and rear stagnation
points on immersed body.
stagnation temperature That at stagnation point, when
all relative kinetic energy has been converted isentropically
to heat.
stainless steel Generally, steels with 12-20 per cent
chromium. Most common is 18-8, these being %
chromium and nickel.
Stairs Sensor technology for affordable IR systems.
stair-stepped Jetpipe whose walls form a precisely calculated
zigzag to minimise radar cross-section.
stair-stepping Step cruising.
STAJ Short-term anti-jam.
stake Anvil-type bench tool for sheet.
stakeholder A person or organization having a professional
interest in a programme. Examples include: the
customer, the customer’s advisors, and everyone
concerned with the programme in the prime contractor
and his suppliers and subcontractors.
stake out To picket aircraft.
staking Swageing terminal on to electrical conductor.
Stalag Luft Prison camp for captured aircrew (G,
WW2).
STALD Standoff tactical air-launched decoy.
stale track Shown on radar display at last known
position, even though it has not appeared on susbequent
updates.
stall 1 Gross change in fluid flow around aerofoil,
usually occurring suddenly at any 2-D section aligned
with flow, at AOA just beyond limit for attached flow (at
which lift coefficient is maximum); characterized by
complete separation of boundary layer from upper
surface and large reduction in lift. Traditional wings
normally * at AOA near 16°-18°, which can be attained at
any airspeed depending on applied vertical acceleration.
AOA for * is increased by slat, and some highly swept
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