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oilerplate
boilerplate Non-flying form of construction where light
weight is sacrificed for durability and low cost (see battleship).
boiloff Cryogenic propellant lost to atmosphere through
safety valves as result of heat transfer through walls of
container (which may be static storage or tank in launch
vehicle).
BOK Bureau of special designers (USSR).
BOL 1 Bearing-only launch.
2 Bottom of loop [engine s.f.c.].
3 Blade [of compressor or turbine rotor] overtip
leakage.
bold-face procedures Emergency procedures, written in
flight manual in bold-face type.
bollard Mooring attachment in form of short upright
cylinder on marine aircraft hull or float bow.
bollock APFC (colloq.).
bolometer Sensitive instrument based on temperature
coefficient of resistance of metallic element (usually platinum);
used to measure IR radiation or in microwave
technology (see radiometer).
BOLT Build, operate, lease, transfer.
bolt 1 In advanced airframe structure, usually precision
fitted major attachment device loaded in shear.
2 In firearm, approximately cylindrical body which
oscillates axially behind barrel feeding fresh rounds,
closing breech and extracting empty cases (see breechblock).
bolter 1 In carrier (1) flying, aircraft which fails to pick
up any arrester wire and overshoots without engaging
barrier.
2 Verb, to perform 1; in the US, boltering.
Boltzmann constant Ratio of universal gas constant to
Avogadro’s number; 1.380546 × 10 –23 J°K –2 .
Boltzmann equation Transport equation describes
behaviour of minute particles subject to production,
leakage and absorption; describes distribution of such
particles acted upon by gravitation, magnetic or electrical
fields, or inertia. Boltzmann-Vlasov equations describe
high-temperature plasmas.
BOM 1 Bill of material.
2 Burst overspeed margin.
bomb 1 Transportable device for delivery and detonation
of explosive charge, incendiary material (including
napalm), smoke or other agent, esp. for carriage and
release from aircraft.
2 Streamlined body containing pitot tube towed by
aircraft and stabilized by fins to keep pointing into relative
wind in region undisturbed by aircraft.
bomb aimer Aircrew trade in RAF (formerly) and
certain other air forces.
Bomb Alarm System Automatic system throughout
Conus for detecting and reporting nuclear bursts.
bombardier Aircrew trade. bomb aimer, in USA and
USAF (formerly).
bombardment ion engine Rocket engine for use in deep
space which produces ion beam by bombarding metal
(usually mercury or caesium) with electrons.
bomb bay In specially designed bomber aircraft, internal
bay for carriage of bombs (in fuselage, wings or streamlined
nacelles).
bomb-burst Standard manoeuvre by formation aerobatic
teams in which entire team commences vertical dive,
usually from top of loop, in tight formation; on
bomb park
command, trailing smoke, members roll toward different
azimuth directions and pull out of dive, disappearing at
low level ‘in all directions’.
bomb damage assessment Determination of effects on
enemy targets of all forms of aerial attack.
bomb detection chamber Explosion-containment
chamber in which objects, such as cargo containers, can
be subjected to a complete simulated air-travel environment.
bomb door Door which normally seals underside of
bomb bay. Can slide rearwards, sideways and upwards,
open to each side or rotate through 180° about longitudinal
axis to release stores from its upper face.
bombed out Forced to leave home because of serious
damage caused by air attack (UK).
bomber Aircraft designed primarily to carry and release
bombs. Term today reserved for strategic aircraft.
Bomber Box Secure teletalk link between Bomber [later
Strike] Command HQ and crews on alert in cockpits
[1958–68] (RAF).
Bomber Command Forward Relay Special unjammable
v.h.f. and u.h.f. transmitters which would have launched
an attack with NW (RAF).
Bomber Controller The individual who, so ordered by
the Prime Minister, would have ordered an attack with
NW (RAF).
bomber-transport Former category of military aircraft
capable of being used for either type of mission.
bomb fall line Bright line on HUD along which free-fall
bombs would fall to the ground if they were released.
bomb impact plot Graphical picture of single bombing
attack by marking all impact of detonation centres on prestrike
vertical reconnaissance photograph(s).
bombing angle Angle between local vertical through
aircraft at bomb release point and line from that point to
target.
bombing errors 1 50% circular error: radius of circle,
with centre at desired mean point of impact, which
contains half missiles independently aimed to hit that
point (see CEP (1)).
2 50% deflection error: half distance between two lines
drawn parallel to track and equidistant from desired mean
point of impact which contain between them half impact
points of missiles independently aimed to hit that point.
3 50% range error: half distance between two lines
drawn perpendicular to track and equidistant from
desired mean point of impact which contain between them
half missiles independently aimed to hit that point.
bombing height Vertical distance from target to altitude
of bombing aircraft.
bombing run Accurately flown pass over target attacked
with free-fall stores.
bombing teacher Primitive classroom rig in which pupil
uses actual bombsight in simulated environment.
bombing up Loading one or more bombers with bombs.
bomblet Small bomb, usually of fragmentation type,
carried in large clusters and released from single streamlined
container.
bomb line Forward limit of area over which air attacks
must be co-ordinated with ground forces; ahead of ** air
forces can attack targets without reference to friendly
ground troops.
bomb park Semi-permanent deck area on carrier
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