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stepped climb
stepped climb Climb in series of steps (1), separated by
slow (drift-up) climb or level flight.
stepped formation One in which successive aircraft or
elements are at higher or lower level.
stepped solvents Solvents in liquid (eg aircraft finish)
which evaporate at very different rates.
step taxi To taxi marine aircraft fast enough to ride on
step (2).
step-up gear One in which output shaft speed is higher
than input, torque being reduced in same ratio; opposite
of reduction gear.
steradian SI unit of solid angle, abb. sr: that solid angle
which, having as its vertex centre of sphere, cuts off area
equal to that of square whose sides are equal to radius of
sphere.
stereogram Stereoscopic set of graphics or imagery
arranged for viewing.
stereographic See polar stereographic.
stereographic coverage Air reconnaissance cover by
overlapping imagery to provide 3-D picture; 53% overlap
is minimum and 60% normal.
stereoscopic cover NATO term for stereographic cover.
stereoscopic pair Two images for stereographic (stereoscopic)
viewing of same scene.
sterile areas Parts of airfield between aircraft manoeuvring
areas.
sterilization-proof Solid rocket propellants (fuels and,
esp., binders) are often degraded by sterilization (4)
heating, and * binders have had to be developed.
sterilize 1 To mark off portion of runway as unusable,
for any reason.
2 To blank off portion of instrument panel, eg for
equipment not yet available.
3 To prohibit unauthorized access, esp. to entire airside
of civil airport for security reasons.
4 Normal meaning for spacecraft either departing for
or arriving from other planet.
5 To deactivate device, eg mine, eg after preset period.
6 To render unusable or unavailable; eg F-111 MLG *
underside of fuselage for weapon carriage.
stern attack Air-intercept attack which terminates with
crossing angle of 45° or less (DoD).
stern-droop Structural sag of rear end of airship.
sternheaviness Tailheaviness of airship.
sternpost Single vertical member marking rear termination
of fuselage, hull or float (BS adds ‘not to be confused
with rudder post’, but often same member).
sternpost angle Acute angle between horizontal (usually
same as longitudinal axis or underside of keel ahead of
step) and line joining top of step on centreline and afterbody
terminator, bottom of sternpost or rearstep (heel) of
flying-boat hull.
stern wave Formed at low speeds as swell ahead of stern
of taxiing marine aircraft.
stero route Named and established, in most respects
synonymous with Airway.
Stevenson screen Standard Meteorological Office
slatted box for ground instruments.
Stevi Sperry turbine-engine vibration indicator.
STEW, Stew 1 Surface-threat electronic warfare [S adds
system].
2 Stewardess [confusing, now rare].
Stex Space technology experiment satellite.
STF 1 Self-test facility.
stick shaker
2 Special trials flight.
StF Stratiform cloud.
StFra Stratus fractus.
STFRCO Squadron terrain-following-radar checking
officer (RAF).
StFrm Stratiform.
STFV Sensor total field of view.
STG 1 Strong.
2 See stg.
3 Special tactics Group (USAF).
StG Stukageschwader, dive-bomber group (US wing]
(G, WW2).
stg Stage.
STGR Search, track and guidance radar.
sthène Non-SI unit of force formerly standard in French
legal system, that giving 1 tonne acceleration of 1 m/s 2 ;
sn = 1,000 N = 1 kN.
S 3 AR See SSSAR.
S 3 T See SSST (2).
STI Standard (or special) technical instruction.
stick 1 Control column (colloq.).
2 Any primary pilot input in pitch, in figurative sense,
eg *-free static stability.
3 Succession of missiles (ordnance items would be
better) fired or released separately at predetermined intervals
from single aircrarft (ASCC).
4 Number of parachutists who jump from one aperture
of aircraft during one run over DZ.
5 A pilot, especially fighter or aerobatic (colloq.).
stick and string Generalized term for construction of
pre-WW1 aeroplanes (colloq.).
stick-canceller Electronic box in FCS whose output is a
stick movement, eg in ASW hover.
sticker Usually on windscreen, displays selling price
[GA aircraft, usually used].
stick-fixed With elevator or tailplane trimmed to hold
level flight and thereafter held in this position. For *
neutral point, see neutral point.
stick-fixed static stability See static margin.
stick force per g Pilot’s applied force in direct fore/aft
movement divided by vertical acceleration resulting.
stick-free With elevator or tailplane trimmed to hold
level flight and thereafter left free (not applicable with
irreversible flight controls).
stick-free manoeuvre point The c.g. position that results
in stick force per g being zero.
stick-free neutral point The location of the aerodynamic
centre or e.g. position with the elevator free to float
without friction.
sticking Tendency of planing bottom of marine aircraft
to adhere to water on takeoff.
stick knocker Stall-warning device added to stick shaker
to give loud knocking aural warning.
stick movement per g Linear fore/aft movement
measured at top of stick divided by resulting vertical
acceleration.
stick pusher Positive stall-prevention system which
when triggered (by sensed AOA or AOA factored by a
rate-of-increase term) forces stick forward, commanding
aircraft to rotate from climb to shallow dive.
stick shaker Stall-warning system which when triggered
by AOA passing preset value (occasionally factored to
allow for high rate of increase) applies large oscillating
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