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allistic capsule]
of multiple exposures on same plate or frame of film,
records trajectory of body moving relative to it.
ballistic capsule Capsule enclosing environment suitable
for human crew or other payload and moving in * trajectory.
ballistic flight Ballistic trajectory; arguably, not flight.
ballistic galvanometer Undamped galvanometer which,
when an electrostatic charge is switched through it, causes
large initial swing, taken to be proportional to quantity of
electricity passing.
ballistic missile Wingless rocket weapon which, after
burnout or cutoff, follows * trajectory.
ballistic parachute canopy spreader Device for accelerating
deployment of drag canopy in certain types of
ejection seat.
ballistic range Research facility for investigation of
behaviour of projectiles or of bodies moving through
gaseous media at extremely high Mach numbers; usually
comprises calibrated range along which test bodies can be
fired, sometimes into gas travelling at high speed in opposite
direction.
ballistic recovery system Large parachute deployed
[sometimes fired by rocket] from above c.g. of [usually
small] G A aircraft.
ballistic re-entry Non-lifting re-entry.
ballistic trajectory Trajectory of wingless body,
formerly propelled but now subject only to gravitational
forces and, if in atmosphere, aerodynamic drag.
ballistic tunnel High-Mach tunnel into which free
projectiles are fired in opposition to gas flow (see * range).
ballistic vehicle Vehicle, other than missile, describing a
* trajectory. Term usually not applied to spacecraft but to
vehicles used in proximity of Earth and at least mainly
within atmosphere.
Ballistic Wind[s] Research into variation of wind with
altitude (USAF).
ballistic wind Theoretical constant wind having same
overall effect on a * projectile as varying winds actually
encountered.
ballizing Forcing a hard oversized ball through a hole
with a small fatigue crack, to bring crack region into
compression.
ball lightning Rare natural phenomenon, materialising
during electrical storms, having appearance of luminous
balls which often appear to spin, eject sparks, travel slowly
and eventually disappear (sometimes with explosion).
ball mat Standard squares or rectangles of tough
flooring containing pattern of protruding freely-rotating
balls facilitating omnidirectional movement of containers
or pallets.
ballonet Flexible gastight compartment inside envelope
of airship (rarely, balloon) which can be inflated by air to
any desired volume to compensate for variation in volume
of lifting gas and so maintain superpressure and alter trim.
ballonet ceiling Maximum altitude from which pressure
aerostat with empty ballonet(s) can return to sea level
without loss of superpressure.
ballon sonde, ballonsonde The original French term for a
sounding balloon. See registering balloon.
balloon Aerostat without propulsion system.
balloon barrage Protective screen of balloons moored by
steel cables around target likely to be attacked by enemy
aircraft.
band-elimitation filter
balloon bed Area of ground prepared for mooring of
inoperative captive balloon.
balloon fabric Range of fabrics of mercerised cotton
meeting specifications for covering lightplanes and,
impregnated with rubber, aerostats.
ballooning Colloq., sudden unwanted gain in height of
aeroplane on landing approach due to lowering flaps,
GCA instruction or, most commonly, flare at excessive
airspeed.
balloon master Person in charge of launch of free-flight
balloons, including liaison with ATC.
balloon reflector In electronic warfare, confusion
reflector supported by balloon(s).
balloon tank Tank for containing liquid or gas
constructed of metal so thin that it must be pressurized for
stability. Such tanks have formed airframe of large
ICBMs.
balloon tyre [tire] Not defined but generally taken to
mean tyre of larger than normal section (profile) and less
than normal pressure.
ball screwjack Screwjack in which friction is reduced by
system of recirculating bearing balls interposed between
fixed and rotating members.
balls-out Maximum possible power (colloq.).
ball turn-and-slip Flight instrument whose means of
indicating slip is a ball free to move within liquid-filled
curved tube having its centre lower than its ends.
ball turret Ventral gun turret on certain large aircraft of
1942–45 – notably B-17, B-24 – having part-spherical
shape.
ballute Balloon-parachute; any system of inflatable
aerodynamic braking used for upper-atmosphere retardation
of sounding rockets or slowing of spacecraft
descending into planetary atmospheres.
BALO Brigade Air Liaison Officer.
Balpa, BALPA The British Air Line Pilots’ Association;
1937-, trade union [office Harlington UB3 5BG] (UK).
balsa Wood of extremely low density (s.g. about 0.13),
originally grown in W. Indies and Central America.
Balt, BALT Barometric altitude.
Baltnet Monitors airspace over Estonia, Latvia,
Lithuania.
BAM 1 Bundesanstalt für Material Prüfung (G).
2 Bird avoidance module.
Bambi basket Deployed under helicopter, esp. for
recovery [esp. from water] of exhausted or injured.
BAMS 1 Brassboard airborne multispectral sensor.
2 Broad-area maritime surveillance (USN).
BAMTRI Beijing Aeronautical Manufacturing
Technology Research Institute.
BAN Beacon alphanumerics (part of FAA ARCTS).
banana case The curved casing of an accessory gearbox
wrapped around the compressor or fan case of a gasturbine
engine.
band 1 Designated portion of EM spectrum, usually
bounded by frequencies used for radio communication.
2 A (usually small) portion of EM spectrum containing
frequencies of absorption or emission spectra.
3 Strip of stronger material built into non-rigid aerostat
envelope to distribute stress from mooring line, car or
other load.
4 Group of tracks on magnetic disc or drum.
band-elimination filter Filter that eliminates one band of
EM frequencies, upper and lower limits both being finite.
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