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sleeve valve
ends and towed large-end first; can incorporate reflective
prism, mesh, MDI or other enhancement.
sleeve valve Any of various techniques for piston-engine
valve gear using one or two concentric sleeves between
piston and cylinder with suitably shaped ports in walls
lining up intermittently with inlet/exhaust connections on
cylinder; usual is Burt-McCollum single sleeve.
slender body One of such large slenderness ratio that
squares and higher powers of disturbances can be ignored.
slender delta Aeroplane whose wing has ogival delta
plan with very low aspect ratio such that at Mach numbers
exceeding 2 entire wing lies within conical shockwave
from nose.
slenderness ratio Length/diameter of fuselage or other
slender body. Generally, synonymous with fineness ratio.
slender wing Not defined: any wing of very low aspect
ratio.
SLEP 1 Service-life extension programme.
2 Structural- life enhancement program[me].
SLES Spacecraft life-extension system.
SLEW Single-tone link-11 waveform (Int.).
slew 1 To rotate in azimuth.
2 To offset centre of P-type or similar display laterally,
eg to study air traffic or surface feature off edge.
3 To rotate gyro spin axis by applied torque at 90°.
slewed flight Yawed, eg with applied rudder while
holding height and with wings level.
slewing Slew; also defined as changing scale on radar
display (not recommended).
slew-wing aeroplane One whose wing is pivoted as one
unit about mid-point, thus as one tip moves forward
opposite tip moves aft. In some forms there is no fuselage,
and wing obliquity to airflow is determined solely by tip
fin(s) and engine pod angles.
SLF Shuttle landing facility.
SLFCS Survivable LF communications system (SAC,
USAF).
SLFP Suction-lift fuel pump.
SLG Satellite landing ground, ie auxiliary field.
SLGPS Small lightweight GPS.
SLGT Slight; CHC adds chance =