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counter-pointer
counter-pointer Dial indication comprising rotating
pointer(s) and counter readout in same instrument.
counter readout Numerical display generated by
numerals on adjacent rotating drums, also called veeder.
counter-reflector Metal mesh or other radio reflector
arranged in pattern under VOR or other ground station
to nullify interference and give radiation as from perfect
level-surface site.
counter-rotating Left and right devices rotate in opposite
directions, on different axes.
countersilo Counterforce attack against ICBM silos.
countersink To form or cut conical depression in workpiece
to receive rivet or bolt head flush with surface.
countersurveillance All active or passive measures to
prevent hostile surveillance.
countertrade Trade in reverse direction generated to
assist high-tech (eg defence) exports by an industrialised
country; in no sense barter.
countervalue Attack directed against enemy homeland
society and industry.
country cover diagram Small-scale map and index
showing availability of air reconnaissance information of
whole country for planning purposes.
countup Oral telling-off of time, usually in seconds,
elapsed since liftoff.
coupé Aircraft, normally with open cockpit[s], fitted
with * top, generally synonymous with canopy forming
integral part of fuselage.
couple Two parallel opposing forces not acting through
same point, producing rotative force equal to either force
multiplied by perpendicular distance separating axes. SI
unit Nm (newton-metre), = 0.748604 lb-ft. Also called
moment, turning moment, torque.
coupled engines Geared to same propeller(s) but not
necessarily mechanically joined.
coupled flutter In which energy is transferred through
distorting structure linking two fluttering masses to
augment flutter of either or both.
coupling 1 Inertia[l] *, tendency for inertia forces in
manoeuvres to overcome stabilizing aerodynamic forces,
esp. in long, dense aircraft having large inertia in pitch and
yaw; eg, rapid roll results in violent cyclic oscillation in
pitch about principal inertial axis, increasingly marked
with altitude owing to divergence of this axis from relative
wind.
2 Connection (electrical, electronic or mechanical)
between flight-control system and other onboard system
such as ILS or TFR.
3 Unwanted connection or interference between two
radiating elements in a planar-array antenna.
coupon 1 Small extra piece formed on casting or, rarely,
forging or extrusion, to provide metallurgical test specimen.
2 See flight*.
courier See delayed repeater comsat.
course 1 UK term for heading.
2 Often used to mean airfield circuit c1908–18.
course and distance calculator Aluminium disc with
pivoted arms for solving three- [even four-] vector navigation
problems (1917–40).
course and drift indicator Bearing-plate.
course and speed calculator More advanced yet compact
mechanical computer for solving vector problems (UK
1935–50).
CP
course corrections Allowances for deviation and
variation.
course deviation indicator Vertical needle of VOR
display.
course light Visual beacon on airway, or light indicating
course [track] of airway (both obs.).
course line Locus of points nearest to runway centreline
in any horizontal plane along which DDM is zero.
course sector Horizontal sector in same plane as course
line limited by loci of nearest points having DDM of
0.155.
course selector See OBS.
courtesy vehicle Battery electric car providing up to 6
seats for elderly or disabled passengers.
courtyard Space in centre of closed-circuit tunnel; hence
* wall, inner wall of tunnel.
COV 1 Common operational value (RAF).
2 Covered, cover, covering (ICAO).
cove Local concave curved region where two structures
meet, eg wing/pylon or pylon/pod.
cover 1 Protection of friendly aircraft by fighters or EW
platforms at higher level.
2 Ground area shown in imagery, mosaics etc.
3 To maintain continuous EM receiver watch.
4 To use fighters to shadow hostile contact from designated
BVR distance.
coverage diagram Plot of air-defence radar performance
against target of particular cross-section for different
elevation angles, plotted on altitude (ordinate) and slant
range.
coverage index See covertrace.
Coverage Level In aerial firefighting, quantity of retardant
per unit area, in US usually USG per 100 sq ft.
cover mod Paperwork [documents] by which DA accepts
SEM (3) or STF (UK).
cover search To select best cover (2) for air reconnaissance
for particular requirement.
covertrace Map overlay listing all air reconnaissance
sorties over that ground area, marking tracks and
exposures.
covert search Patrol using advanced sensors from high
level so that aircraft’s presence is undetected from ground,
esp. in offshore patrol for customs, immigration or fishery
protection.
Covos Comité d’Etudes sur les Conséquences des Vols
dans la Stratosphère (Int.).
cowl Covering over installed engine or other device,
normally mainly of hinged or removable panels.
cowl flaps See gills.
cowling See cowl.
CP 1 Critical point.
2 Centre of pressure (often c.p.).
3 Controllable pitch (not constant speed).
4 Chlorinated paraffin.
5 Circularly polarised.
6 General call to several specified stations (ICAO).
7 Co-pilot.
8 Critical parameter.
9 Cathode protection.
10 Command post.
11 Centre-perforate (rocket grain).
12 Computer, or communications, processor.
13 Constant power.
14 Control plane.
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