1Dk4eXg

scavenge filter
scavenge filter Principal filter in a lubricating oil circuit,
between the scavenge pump and tank.
scavenge oil Lubricating oil on its way back from the
lubricated part, also called return oil.
scavenge pipe Carries lube oil from machine, eg engine,
to tank. In US, often scavenger.
scavenge pump Pumps lube oil out of machine, in case of
engine fitted with wet sump, from base of sump. Gas
turbines generally have several scavenge (return) gears on
same shaft as pressure gears. In US, often scavenger.
scavenge(r) system Exit ducting from wind tunnel for
removal of contaminants, eg from smoke apparatus,
combustion products from burning tests or exhaust from
combustion devices.
SCC 1 Standing Consultative Commission (arms
control, ABM treaty).
2 Security consultative committee.
3 Sector control, or command, centre.
SCCAM Military coordination and control service for
complementary route[s] clearances.
SCCI System controllers and cockpit indicators.
SCCOA Système de commandement et de conduite des
opérations aériennes (F).
SCCS Source-code control system (software).
SCD 1 Speed computing display; airspeed (often TAS)
needle plus Mach counter.
2 Signal command decoder.
3 Specification control drawing.
4 System category diagram.
5 Side cargo door.
SCDA Software cost-driver attribute.
SCDDS Sensor control-data display set.
SCDL Surveillance and control data-link.
SCDU 1 Selective control decode unit (IFF).
2 Satellite control data unit.
SCE 1 Signal conditioning equipment.
2 Single corporate entity.
3 Spacecraft command encoder.
scenaric computer One able to assemble visual scenes, eg
in Tepigen.
scene-matching Guidance or navigation by comparing
terrain below with stored information; generally synonymous
with image-based navigation.
SCEPS Stored chemical energy propulsion system.
Sceptr Suitcase emergency procedures trainer (cheap
erasable ROM).
SCF 1 Satellite control facility.
2 Single-configuration fleet.
3 Stress-concentration factor.
SCFN Spherical convergent flap nozzle.
SCG Speed-control governor.
SCH 1 Sonobuoy cable hold (autopilot selector).
2 Simplified combined harness.
sched Schedule[d].
schedule 1 Precisely controlled mechanical movements
to meet system demands, carried out automatically by
system usually provided with feedback; eg variable inlets
and nozzles in supersonic airbreathing engine installation.
2 Preplanned sequence of time events, eg aircraft
inspections and overhauls or timetabled civil flights.
scheduled service Air-carrier service for any kind of
payload run to timetable.
scheduled speed Any of type-specific speeds published in
Schwarm
flight manual, eg V S , V AT ; in no way connected with speed
in commercial use, which is defined as block speed.
scheduling Numerical, analog or graphical description
of sequence of scheduled (1) movements, eg of turbojet
inlet spike.
schedule inventory List of all safety equipment and other
removable items carried on board.
schematic diagram Drawing which explains functions
and general spatial relationships but which uses standard
symbols and makes no attempt to portray visual appearance.
Often includes only one subsystem, rest of machine,
aircraft or other device being in outline or phantom line
only. Alternatives are exploded drawing, block diagram.
Schlichting Original (1936) theory treating of flat plate
in supersonic flow.
schlieren German word (nearest English equivalent is
‘striations’) for various shadowgraph-like techniques for
optical investigations based on 1859 method of Foucault.
Basic feature is small light source, parallel rays of light
through region under investigation and opaque cut-off at
focus of second lens projecting image on screen or photographic
film (either point source and pinhole cut-off or
line source and line cut-off). Variations in density, eg in
flow through shock-waves, Prandtl-Meyer expansions
and supersonic flow generally, are sharply visible as tonal
gradations.
Schmidt camera Elegant astronomical camera/telescope
with objective in form of thin plate of glass and rear
concave spherical mirror focusing on curved film.
Objective plate has one surface figured (thicker and
convex at centre, thin and concave around periphery) to
correct mirror’s aberration, its own chromatic aberration
being slight because of small thickness.
Schmidt duct Pioneer flap-valve pulsejet.
Schmidt number Sc = µ/ρD 12 where µ is viscosity, ρ is
density and D 12 diffusion coefficient; ratio of viscous and
mass diffusivity, or kinematic viscosity divided by mass
diffusivity.
Schottky defect Atom missing from crystal lattice.
Schottky diode Barrier-layer device based on rectification
properties of contact between metal and
semiconductor due to formation of barrier layer at point
of contact.
Schottky effect Small variation in electron current of
thermionic valve caused by variation in anode voltage
affecting work done by electrons in escaping.
schräge Musik Oblique music = jazz, code name for
night-fighter armament of upward-firing cannon (G,
WW2).
Schuler pendulum One whose length equals radius of
Earth, and thus when carried in vehicle moving near
Earth’s surface always indicates local vertical. In practice
any pendulum having same period of approximately
84 min., achieved at particular relationship between c.g.
and pivot, such that centre of rotation of pendulum is
always at centre of Earth. Used in stable platforms of INS.
Schuler tuning Adjusting period of Schuler pendulum so
that its centre of rotation exactly corresponds with centre
of Earth.
Schultz-Grunow Standard treatment for turbulent flow
in viscid fluid at R from 10 6 to 10 10 .
Schwarm Two Rottes, fighters in two loose pairs (G)
arguably = finger four.
593