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co-axial cable
blades on same axis rotating in opposite senses independently.
Not same as contra-rotating.
co-axial cable Comprises central conductor wire and
conducting sheath separated by dielectric insulator.
COB 1 Co-located operating base.
2 Certificated operational base.
3 Catenary obstruction beacon, mounted on pylons
supporting power cables .
cob The thick inner boundary around the centre of a
compressor rotor stage or disc.
cobalt Hard, silver-white metal, density 8.9, MPt
1,495°C, important in steels and in high-temperature
engine alloys. Co–60 is dangerous radioisotope theoretically
producible in large amount by nuclear weapons.
cobblestone turbulence 1 High frequency * due to large
mass of randomly disturbed air without significant gross
air movement.
2 Buffet experienced by jet V/STOL descending into
ground effect.
COBE Cosmic-origin background explorer.
Cobol Common business-oriented language.
cobonding Manufacture of composite aerofoil, esp.
wing, in which entire surface is assembled and cured, but
with one skin (usually upper) separated by debonding
agent. This skin is then attached by removable bolts.
Cobra 1 Manoeuvre in which from level flight at
moderate airspeed pilot applies maximum symmetric
nose-up command, reaching AOA 90° up to possibly
130°, when control neutralised for flip-down recovery to
level flight about 5 s later. Modest gain in height, large loss
in airspeed [energy], for dynamic braking.
2 Co-optimized booster for reusable applications.
3 Coastal battlefield reconnaissance and analysis
(USMC).
4 Collection of broadcasts from remote assets.
COBS Canadian orbiter boom sensor; S adds system.
COBY Current operating budget year.
COC 1 Common (or combat) operations centre, for
tactical control of all arms in theatre.
2 Catalytic ozone converter.
3 Copper on ceramic.
4 Chamber of Commerce.
5 Cash operating cost.
COCC Contractor’s operational control centre.
cockade National insignia worn by military aircraft,
esp. one of concentric rings.
cocked Aircraft, especially combat type, preflighted
through all checklists to point of starting engines.
cocked hat Triangle formed by three position lines that
do not meet at a point.
cockpit Space occupied by pilot or other occupants, esp.
if open at top. Preferably restricted to small aircraft in
which occupants cannot move from their seats; most *
contain only one seat. Term could arguably be applied to
all aerodyne pilot stations, but flight deck preferred for
large aircraft.
cockpit alert State of immediate readiness with combat
aircrew fully suited, in * and ready to start engine.
cockpit audio monitoring Activated by flight crew,
continuously transmits live audio via satellite from
aircraft [jet airliner] experiencing emergency.
cockpit bag Container, usually flexible fabric, designed
to hold flight guides, charts, headset etc.
cockpit check Numbered list of investigations of status
CODSIA, Codsia
[and if necessary of operability] of every functioning item
according to meticulously followed schedule, printed on
paper in a light aircraft and stored electronically in more
complex aircraft, carried out on entering cockpit [after
completing externals] by pilot, assisted by any other
members of flight crew if necessary.
cockpit cowling Aircraft skin around cockpit aperture.
cockpit television sensor Solid-state CCD camera
recording what the pilot sees during each flight.
cockpit voice recorder Automatic recycling recorder
storing all crew radio and intercom traffic, plus background
noise, during previous several missions.
Coco exercise Combat mission exercise called off when
aircraft are lined up on runway.
Cocom Combat Commander (JBFSA).
Cocomo Constructive cost model (software).
Cocraly Anti-oxidation coating for hot metal, from Co,
Cr, Al, Yttrium.
COD 1 See carrier on-board delivery.
2 Component operating data.
3 Cash on delivery.
4 Chemical oxygen demand.
CODA, Coda Centre Opérationnel de la Défense
Aérienne (Taverny, F).
Codamps Coupled ocean/atmosphere mesoscale prediction
system.
Codan Carrier-operated device anti-noise.
Codar Correlation detection and recording, or ranging
(ASW).
Code 1 Two capital [upper-case] letters assigned to
airline [any public carrier]; sometimes shared, thus
Cronus aircraft operate on * of Aegean. These letters
preface the three- or four-digit number identifying a
particular time-tabled flight.
2 See * letters.
3 Another meaning is the series of pulses from a
transponder.
Code Bambini Literally ‘child’s talk’, multi-lingual
tactical radio language (Switz.).
code block Standardised format of data identifying each
frame in visual, IR or SLAR film, with provision for highspeed
computer recall.
Codec Coder/decoder.
code letters Pairs of letters [from 1944 often letter +
number] identifying unit of aircraft in WW2. Each aircraft
also assigned individual letter (RAF, USAAF).
code light Surface light giving signal, usually Morse; if
at airfield could be called beacon.
codem Coded modulator/demodulator.
coder Part of DME transponder which codes identity
into responses.
code rate Ratio of actual data bits to total information
digits transmitted in radar or communications system
having deliberate redundancy. Symbol R.
Coderm Committee for Defence Equipment R & M
(UK).
Codes Common digital exploitation system.
codes Numbers assigned to multiple-pulse reply signals
transmitted by ATCRBS and SIF transponders.
Codib Controlled-diffusion blade (or blading).
coding Arrangement of problem-solving instructions in
format and sequence to suit particular computer.
CODSIA, Codsia Council of Defense and Space
Industry Associations [office, Arlington, VA 22201] (US).
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