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shoulder
propelled shot (2), usually to harden and relieve internal
stress.
shoulder 1 Area immediately beyond edge of pavement,
such as a runway or parking apron, so prepared as to
provide transition between pavement and adjacent
surface.
2 Added paved area at taxiway corners and intersections
to ensure outboard megajet engines do not operate
over grass.
3 See * season.
shoulder bolt Thread of smaller diameter than shank; for
attaching plastics parts where over-tightening must be
avoided.
shoulder cowl Usually means cowling panel(s) hinged
upwards near top of sides.
shoulder fare That charged for period between standard
and off-peak.
shoulder harness Seat harness including straps passing
over shoulders to prevent body jack-knifing forward.
shoulder pylon Auxiliary pylons [usually for AIM-9 or
similar missiles] on sides of main pylon for tank or other
heavy store.
shoulder season Intermediate demand between low and
peak, or intermediate time of day, in determining
passenger fare structure.
shoulder wing Wing attached between mid and high
positions. Original German Schulterdecker implied wing
depth more than half that of fuselage, with blended
wing/body junction.
show Preplanned air operation, especially over hostile
territory (RAF, WW2, colloq.).
shower(s) Precipitation from convective cloud characterized
by sudden onset, rapid variation in intensity and
sudden stop, with intervening periods of part-clear sky.
showerhead Liquid-propellant rocket injector in which
numerous fuel and oxidant sprays are distributed (with
various forms of impingement) over flat or curved
surface.
show finish Glass-like finish (on homebuilts, usually)
achieved by repeated doping and rubbing down.
shp, s.h.p. Shaft horsepower [sometimes written SHP].
SHR 1 Shear (weather).
2 Superheterodyne receiver.
SHRA Heavy rain showers.
shrapnel Anti-personnel device comprising gunlaunched
projectile which near target explodes, projecting
numerous lethal fragments and contained balls or cubes.
No aerospace relevance, but included here bceause word
has become commonly used to mean any damage caused
by high-velocity splinters.
shrimpboat Small marker of clear plastic on which
controller writes flight identity, FL and other information,
subsequently moved by hand to remain adjacent
to blip on display.
shrinkage Natural reduction in dimensions of most castings
on cooling (see shrink rule).
shrink fit Force for interference fit between two metal
parts obtained by heating outer, cooling inner, or both.
shrink rule Casting mould made 0.010 (linear) oversize
to allow for shrinkage.
shroud 1 Plate formed integrally with gas-turbine fan,
compressor or turbine blade usually in plane perpendicular
to blade major axis. In fan and upstream compressor
blades usually as part-span, * being formed in halves on
each side of blade and mating with those adjacent to damp
vibration. In turbine rotor invariably on tip, serving as
ring minimizing gas leakage around periphery.
2 Circular duct surrounding propeller or propulsive
fan.
3 Heat-resistant aerodynamic fairing over space
payload or any forward-facing projection on space launch
vehicle, ICBM or other hypersonic vehicle.
4 Extensions of fixed surface of aerofoil (eg wing,
tailplane) projecting behind hinge line of movable surface
(eg flap, aileron) to reduce drag or improve flight control.
5 Main upper hinged flap at rear of augmentor CCW
wing, downstream of intake; can have trailing tab.
6 Covering plate on face of centrifugal impeller
enclosing flow passages and preventing leakage.
shroud coolant Refrigerant cooling volume in which
cryogenic cooling takes place, eg LH 2 serves as **
surrounding liquefaction of helium.
shrouded balance Leading edge of control surface
enclosed within trailing edge of fixed structure.
shrouded blade Blade fitted with shroud (1).
shrouded impeller Centrifugal impeller, eg of supercharger,
enclosed by shroud (2).
shrouded insulator Radio aerial insulator (eg HF wire)
fitted with overlying shroud (normal meaning of word) to
prevent ice connection to metal structure.
shroud lines Main suspension cords of parachute
connecting load to canopy.
SHRS Stabilized horizon-reference system.
SHS Since hot section (inspection flight hours).
SHSS Short-haul system simulation.
Shud, S-HUD Smart HUD.
shunt connection Bypass circuit, usually taking most of
current.
shunt excitation Feeding mast radiator (aerial) about
0.25 of way up, earthed at base.
Shup Silo-hardness upgrade program (USAF).
shutdown 1 For rocket engine, cut-off.
2 For conventional aircraft-propulsion engine,
reducing power to zero and rendering inactive, eg by
turning off HP cocks. If in flight becomes IFSD.
Normally follows obvious or signalled failure.
3 Event in which (2) occurs.
shuttered fuze Inadvertent initiation of detonator will
not initiate booster or burst charge.
shuttle 1 Generalized term for reusable space launch
vehicle recovered by aeroplane-type flight.
2 High-frequency trunk-route service characterized by
no-reservations, payment on board and, in some cases,
aircraft always boarding, and departing if full before
announced time.
3 Sliding drive member of flight-deck accelerator
(catapult).
shuttle bombing Use of two bases, aircraft making oneway
bombing missions between them.
shuttle valve Fluid-flow valve of bistable type which
passes flow from one line and isolates other or vice versa.
SHWR Shower.
ShyFE, Shyfe Sustained hypersonic flight experiment
(UK).
SI 1 Système International d’Unités; standardized
system of units adopted (but not yet fully implemented)
by all industrialized nations.
2 Servicing instruction.
SI
613