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ow
bow Rhyming with go:
1 Curvature along length of turbine blade or other
slender forging, or curvature due to instability in structural
compression member.
2 Curved member forming tip of wing or other aerofoil,
esp. one with fabric covering.
bow cap Structure forming front end of airship hull or
envelope. Alternatively, nose cap.
Bowen-Knapp camera High-speed strip-film camera
used in vehicle flight testing.
bowser 1 Airfield fuel truck, roadable and selfpropelled;
unpropelled, * trailer.
2 Used as adejective, specially modified to contain
overload or ultra-long range fuel, hence * wing, * fuselage.
Bow’s notation Conventional system of representing
structural forces and stresses by letters and/or numbers in
graphical stress analysis (rhymes with slow).
bow stiffeners Longitudinal stiffeners arranged radially
around nose of aerostate envelope (esp. blimp or kite
balloon) to prevent buckling under aerodynamic
pressure. Alternatively called battens.
bow wave 1 Shockwave from nose of supersonic body,
esp. one not having sharply pointed nose.
2 Shockwave caused by motion of planetary body
through solar wind.
3 Form of wave caused by bows of taxiing marine
aircraft.
4 Form of wave caused by landplane nosewheels
running through standing water.
box 1 Tight formation of four aircraft in diamond
(leader, left, right, box).
2 Structural heart of a wing comprising all major spars,
ribs and attached skins (often forming integral tankage),
but usually excluding leading and trailing edges,
secondary structure and movable surfaces.
3 Major sections of fuselage, especially where these are
of rectilinear form and thus not describable as barrel
sections.
4 Aircraft structure formed from two or more lifting
planes (wing or tail), linked by struts and bracing wires.
In early aviation no other form could compete for lightness
and strength.
5 Airlifter cargo compartment, simplified to basic rectilinear
form and dimensioned overall.
6 Above-floor removable cargo container, with various
standard dimensions.
7 Container of lights in visual ground guidance system,
thus 4 * VASI.
box beam Hollow beam (1) of essentially square or rectilinear
cross section.
box connector Multi-circuit connector having foursided
box sockets, with linear pin engagements (2 or 3
rows, up to 240 circuits).
boxer piston engine having two crankshafts and [e.g.
four or six] parallel cylinders in rectilinear formation.
box girder See box spar.
boxing Process of assembling major airframe sections in
erection jig; includes fuselage box (3) sections.
boxkite Kite in form of rectangular- (often square-)
section box, open at mid-section and at ends. Structurally
related to early biplanes in form of box (4).
box position Rear aircraft in box (1).
box rib Rib assembled from left and right sides
BR, Br
separated by a peripheral member following profile of
aerofoil.
box sizing Part of GAMM in which an aircraft fuselage
cross-section is selected and optimum cargo box length
determined for groupings of vehicles or other large loads.
box spar Spar assembled from front and rear webs
separated by upper and lower booms.
box tool Tangential cutting tool incorporating its own
rest, used on automatic turning machines.
box wing Diamond wing.
Boyle’s law In an ideal gas at constant temperature,
pressure and volume are inversely proportional, so that
PV = f(T°) and P/ρ = RT.
BP 1 Bite processor.
2 Bottom plug.
3 Braided pultruded.
4 Boron phosphide.
5 Beam pointing.
b.p. 1 Bypass (jet engine); thus, * ratio.
2 Band-pass filter.
BPA 1 British Parachute Association, successor to
British Parachute Club (1956, office Leicester).
2 Blanket purchase agreement.
3 Beam-pointing accuracy.
BPC 1 Gas-turbine barometric pressure control.
2 Benchmark pricing guide.
3 British Purchasing Commission (WW2).
4 Basic primer concept (paint).
BPCU Bus power control unit.
BPDMS Base, or basic, point-defense missile system.
BPE 1 Best preliminary estimate.
2 Bomber penetration evaluation.
B Per T Squadron for testing heavy aircraft (AAEE,
WW2).
BPF 1 Band-pass filter.
2 Blade-passing frequency.
3 British Pacific Fleet (WW2).
BPI 1 Boost-phase intercept[or].
2 or bpi, bits per inch (EDP).
BPIS Boost-phase intercept system.
BPL Band-pass limiter.
BPLI Boost phase launch[er] intercept.
BPM Binary phase-modulation.
BPP Breakthrough [in] propulsion physics (NASA).
BPPA British Precision Pilots Association; affiliated to
FAI, orienteering without navaids, assisting handicapped/paraplegic
pilots (office Saxmundham).
BPR Bypass ratio.
BPS Balanced pressure system: buried glycol pipes
trigger alarm if stepped on.
2 Bistable phosphor storage.
3 Bytes per second.
4 See next.
5 Ballistic protection system.
bps Bits per second (EDP).
BPSK Binary phase-shift keying.
BPt Boiling point.
BP v L Union of aircraft maintenance engineers [D-
53815 Neunkirchen] (G).
BQ Ground-launched controllable bomb [ie, SSM]
(USAAF 1942–45).
Bq Becquerel[s].
BR, Br 1 Bomber-reconnaissance.
2 Mist (Metar code).
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