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ooster
brute force, usually by hydraulic jacks. Much simpler and
cruder than a powered flying-control system (see servo).
booster 1 Boost rocket.
2 Sensitive high-explosive element detonated by fuze or
primer and powerful enough to detonate a larger main
charge.
3 LP compressor, with from one to five stages, downstream
of an HBPR fan and rotating with it to
supercharge the core airflow into the HP spool. In the US
such an engine is often called a mixed-twin-spool
turbofan.
booster APU APU capable, usually in emergency only,
of augmenting aircraft propulsion.
booster coil Battery-energised induction coil to provide
a spark to assist piston engine starting.
booster magneto Auxiliary magneto, often turned by
hand, for supplying hot sparks during piston engine
starting.
booster pump 1 Centrifugal pump, often located at
lowest point of a liquid fuel tank, to ensure positive supply
and maintain above-ambient pressure in supply line. In
integrao wing tanks usually mounted outside the tank on
back of rear spar web.
2 Auxiliary impeller in cryogenic propellant system to
maintain system pressure and prevent vaporization
upstream of main pump.
booster rocket, booster stage See boost rocket, though *
stage implies a large long-burning stage for a large vehicle.
booster stages Booster (3).
boost/glide vehicle Aerodyne launched under rocket
thrust and accelerated to hypersonic speed in upper
fringes of atmosphere, thereafter gliding according to any
of various predetermined trajectories over distances of
thousands of miles.
boost motor See boost rocket.
boost phase Initial phase of launch and rapid acceleration
of missile or other short-range aerodynamic vehicle
fitted with boost rockets.
boost pressure See boost (2), international *, override *.
boost pump Booster pump.
boost rocket Rocket motor, usually solid propellant and
sometimes used in multiple, used to impart very large
thrust during stages of launch and initial acceleration of
missile or other vehicle launched from ground or another
aerial vehicle. Almost all kinds of ** burn for a few
seconds only, and in some cases for only a fraction of a
second. Sometimes case and chamber forms part of
vehicle, but most boost rockets are separate and jettisoned
after burnout.
boost rocket impact area Area within which all ** should
fall during launches on a given range.
boost separation Process by which boost rocket thrust
decays and becomes less than drag, causing rearward
motion relative to vehicle and subsequent progressive
unlocking, possibly relative rotation, and detachment.
boost/sustain motor Rocket comprising fast-burning
high-thrust portion followed by slow-burning low-thrust
portion.
boost vehicle SDI term for space or long-range missile
launcher.
boot 1 Flat array of flexible tubes bonded to leading
edge of wings, fins and other aircraft surfaces to break up
ice. Fluid pressure is alternately applied to different sets
of tubes in each boot to crack ice as it forms.
boring
2 Shroud or vizor enabling cockpit radar to be viewed
in bright sunlight.
bootie 1 Protective cover for pitot tube, usually with
streamer.
2 Soft fabric overshoe warn before walking on aircraft
skin or entering engine duct.
bootstrap Noun, hoisting gear to remove disabled
engine or lift replacement engine to pylon or [trijet] to tail
engine position; and verb, to perform lifting operation.
Can also be applied to modules.
bootstrap exploration Using each space mission to bring
back information to help subsequent missions, esp. in
lunar exploration (colloq.).
bootstrap operation Dynamic system operation in which
once cycle has been started by external power, working
fluid maintains a self-sustaining process. A gas turbine,
once started, sustains bootstrap operation because the
turbine keeps driving the compressor which feeds it. Thus,
* cycle \(cold-air unit), * mainstage engine pump (turbine
being fed by propellants delivered by pump), etc.
Boozer Code name for British ECM [two-colour
warning lights] carried by Mosquito aircraft in 1944.
BOP 1 Balance of payments, esp. with regard to
national participation in multinational programme.
2 Basic operating platform (bare base airfield).
3 Bit-oriented protocol.
BOPS 1 Burn-off per sector; fuel burned on each sector,
or segment, or stage (all three words are used in flightplanning
documents) in commercial transport operation.
2 Beam-offset phase shifter (Awacs).
bops Billions of operations per second.
BOR Basic operational [or operating] requirement.
Bora Cold, squally wind (Adriatic, Aegean).
Boram Block-orientated random-access memory.
boresafe fuze Projectile fuze rendered safe by interrupter
until projectile has cleared gun muzzle.
borescope Slender optical periscope, usually incorporating
illumination, capable of being inserted into narrow
apertures to inspect interior of machinery.
borescope port Circular ports, fitted with openable caps,
through which borescopes may be inserted (esp. in aircraft
engines).
boresight 1 Verb, to align gun or other device by means
of optical sighting on a target.
2 Noun, precise aim direction of gun, directional
aerial/antenna, camera, etc.
boresight camera Optical camera precisely aligned with
tracking radar and used to assist in alignment of aerial
[antenna].
boresight coincidence Optical alignment of different
adjacent devices, such as radar waveguide, reflector,
passive interferometer and IR or optical camera.
boresight line Optical reference line used in harmonising
guns and other aircraft weapon launchers.
boresight mode Radar is locked at one chosen angle
between dead ahead and –2° or –3°.
boresight test chamber Anechoic chamber containing
movable near-field test targets and aerials, capable of
being wheeled over nose of radar-equipped fighter
aircraft.
BORG Basic Operational Requirements Group
(ICAO).
boring Process of accurately finishing already-drilled
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