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corel
core (1), disconnects drive to tilting rotors (rarely, to helicopter
transmission).
corel Combined omnidirectional runway/taxiway edge
light[ing].
coring Uneven flow of oil through oil cooler due to
reduced viscosity of oil in hot central core.
coriolis acceleration Acceleration of particle moving in
co-ordinate system which is itself accelerating, eg by
rotating. In Earth-referenced motion, ** is experienced in
all motion parallel to local surface except for that on
Equator.
coriolis correction Applied to all celestially derived fixes
to allow for coriolis acceleration.
coriolis effect 1 Physiological response (eg vertigo,
nausea) felt by persons moving inside rotating container
(eg space station with rotation-induced gravity) in any
direction other than parallel to axis.
2 According to AGARD: ‘The acceleration, due to an
aircraft flying in a non-linear path in space, which causes
the displacement of the apparent horizon as defined by the
bubble in a sextant’. This definition is inadequate.
coriolis force Apparent inertial force acting on body
moving with radial velocity within a rotating reference
system. Such a force is necessary if Newtonian mechanics
are to be applicable. On Earth, ** acts perpendicular to
direction of travel, towards right in N hemisphere and
towards left in S hemisphere. Also called deflecting force,
compound centrifugal force, geostrophic force.
coriolis parameter Twice component of Earth’s angular
velocity about local vertical, ie twice Earth rate multiplied
by sin lat.
coriolis rate sensor Instrument based on beam vibrating
in plane of aircraft-referenced vertical, sensing any disturbance
about longitudinal axis.
corkscrew Evasive manoeuvre, esp. when subjected to
stern attack by fighter; interpretation variable but * axis
basically horizontal.
Corliss valve Fluid-system throttle in form of a section
of pipe rotating on diametral axis. [not to be confured
with steam-engine * gear].
corncob Descriptive generic name for multi-row radial
or multi-bank in-line piston engine (colloq.).
corner point Instantaneous change in slope of graph; eg
kink in payload/range curve, esp. limiting range for max
payload.
corner reflector Passive device for giving strong radar
echo, based on three mutually perpendicular metal plates
or screens which automatically send back radiation
directly towards source.
corner speed Lowest airspeed at which a fighter can pull
structure- or aerodynamic-limiting g.
Corogard Vinyl-modified polysulphide paint resistant
to hydraulic fluid, usually silver from added aluminium
powder.
Corona Radio countermeasure: issuing misleading
voice commands to enemy fighters (RAF Bomber
Command WW2).
corona discharge Electric discharge occurring when
potential gradient around conductor is sufficient to ionise
surrounding gas. Unlike point discharge, can be luminous
and audible, but unlike spark discharge there are an
infinity of transmission paths carrying continuous
current. Also called brush discharge, St Elmo’s fire (see
static wick).
corrugated strip
co-rotating wheels Landing-gear wheels on live axle and
thus constrained to rotate together.
Co-Route Company route.
CoRP Common radar processor, partner to MoRE.
corpuscular cosmic rays Cosmic rays are primary
particles (protons, alpha particles and heavier nuclei)
which react with Earth atmosphere to yield particles and
EM radiation. Term corpuscular is redundant.
CORR Corridor.
corrected advisory Resolution advisory that instructs
pilot to change vertical speed [ROC]. [TCAS].
corrected airspeed No defined meaning [see airspeed,
SSEC].
corrected altitude No defined meaning, other than “true
height above SL” (see altimeter errors).
corrected gyro Normally taken to be one corrected (by
latitude nut) for apparent wander due to Earth rotation.
correction Many, such as SSEC.
corrective advisory Resolution advisory commanding
changes in ROC, vertical speed.
correlation Confirmation that aircraft or other target
seen visually or on radar display or plotting table is same
as that on which information is being received from other
source(s).
correlation criterion Statistical basis for defruiting or
decoding raw IFF, typically on ** of 2/7, ie 2 valid
synchronous replies detected within any 7 successive
interrogations.
correlation factor In nuclear warfare, ratio of ground
dose-rate reading taken at approximately same time as
one at survey height over same point.
correlation protection Development by RAE with
industry of method of avoiding false ILS indications
caused by spurious signals reflected from large objects
near runway; localizer and glide-path aerials duplicated
(respectively horizontally and vertically) and emit signals
which, if not received almost simultaneously at aircraft,
are suppressed.
corridor 1 Geographically determinate path through
atmosphere, typically curved-axis cone with apex at
surface, along which space vehicle must pass after launch.
2 Path through atmosphere, geographically determinate
for given entry point, along which space vehicle must
pass during re-entry; has precisely defined upper and
lower limits, above which vehicle will skip back into space
and below which it will suffer severe deceleration and risk
injuring occupants or burnup through heating.
3 Assumed safe track in LO penetration of hostile
territory.
4 Path through atmosphere, usually at low level, along
which defences are assumed handicapped by prior seeding
with chaff and decoys.
5 Region of any shape on graph within which solution
to problem is possible.
6 In Europe pre-1960, nominated tracks along which
aircraft were permitted to cross a frontier.
corrosion A normally used word, but see exfoliation.
corrugated mixer Turbofan core nozzle of deep multilobe
form to promote rapid mixing with fan airflow.
corrugated skin Stabilized against local bending by
uniform rolled corrugations which, when used as external
skin of aircraft, are aligned fore and aft (incorrectly
assumed parallel to local airflow).
corrugated strip Interposed between welded sections of
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