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eal fluid
missiles, RPVs and other unmanned vehicles and
esp. aboard warship.
real fluid One exhibiting viscosity.
real precession That induced in gyro by applied force, eg
friction or imbalance, and not by Earth’s rotation.
real time 1 In EDP (1), operation in which event times
are controlled by portions of system other than computer
and cannot be modified for convenience in processing; not
necessarily simultaneous with time in everyday sense.
2 Absence of delay, except for time required for transmission
by EM energy, between occurrence of event or
transmission of data, and knowledge of events or reception
of data at some other location (DoD). Neither
definition has anything to do with time computer is
processing as distinct from warm-up time or rest periods,
which incorrectly figure in some popular definitions.
real-time clock One indicating actual time.
real-time reconnaissance Sensing, recording and
relaying information ‘as it happens’.
real wander See real precession.
REAP, Reap Rapidly elevated aerostat program
(USA).
Reaps, REAPS Rotorcraft external airbag protection
system.
rear area That behind combat and forward areas in
battle.
rear bearing In single-shaft gas turbine, that supporting
turbine.
rear-box wing Usually means three-spar.
rear cover Aft closure of piston-engine [esp. radial]
crankcase, incorporating drives and mounting faces for
accessories.
rear crew This usually means flight crew other than
pilots.
rear echelon Elements of air-transport force not
required in objective area.
rear gunner Member of crew of [usually large] military
aircraft charged with defence against fighter attack from
the rear, after 1939 usually occupying a power-driven
turret.
rear-loading Provided with door(s) and ramp extending
across full cross-section of fuselage interior for loading of
vehicles and other bulky cargo, and for air dropping.
rearming Replenishment of consumed ordnance
between missions.
rear pit Back seat in tandem cockpit, hence rear-pitter
(military colloq.).
rearplane Rear wing of tandem-wing aircraft. Not justified
when foreplane is clearly for control rather than lift
but correct term where front and rear wings are comparable
in size.
rear port Aperture, usually circular, in solid rocket
motor case at end or on face opposite to nozzle which can
be opened to reduce internal pressure for thrust cutoff.
rear stagnation point That at which fluid is at rest on
surface of body on downstream side and from which a
streamline emanates.
rear step That at trailing edge of seaplane (flying boat)
afterbody, where planing bottom terminates; in some
designs a point, but usually either vee-step or a sharp-edge
discontinuity sufficient to break hydrodynamic attachment
to skin.
rear turret A [usually power-driven] gun turret at, or
reciprocating engine
very near, the tail end of the fuselage, also called tail
turret.
rear view display HUD system in which information is
fed from behind pilot’s helmet via optical fibres to
collimating lens and combiner glass close in front of eyes.
REAs Responsible engineering activities.
Réaumur Non-SI temperature scale on which ice point
(1 atmosphere) is 0° and water boiling point 80°, symbol R.
REB Rolling-element bearing.
ReB Re-entry body.
rebaselining Term coined to describe programme to
refine turboprop cruise rotational speeds, e.g. on A400M
aircraft.
rebated blade Solid light-alloy (rarely, wood laminate or
GRP) propeller blade whose leading edge is cut away to
accommodate encapsulated electrothermal anticing
element.
Rebecca Pioneer DME used by airborne interrogation
of Eureka beacon (1942). Still in production in 1970 as *
12 for airborne forces and used in conjunction with
MR 343 air-dropped beacon.
re-blueing Return to USAF after period [e.g., on liaison
or training] with another service.
rebreather Closed-circuit oxygen system from which
CO 2 and water are continuously removed, pressure being
maintained by adding fresh oxygen (see * bag).
rebreather bag Gastight sac in oxygen line near mask so
that incoming gas is diluted with exhaled breath;
normally feature of airline passenger system.
Rebro Relay broadcasting.
REC 1 Received, receiving (ICAO).
2 Radio-electronic combat (USSR, R).
3 Recommend.
recalescence point Temperature, exhibited only by iron
and some other ferromagnetic materials, at which on
cooling from white heat exothermic change in crystalline
structure halts cooling and can cause momentary rise in
temperature.
Recap Reliability evaluation and corrective-action
program.
recapture Regain of revenue from spilt passengers (spill
effect) who rebook on later flight by same carrier.
Recat Reduced-energy for civil air transport.
recce Reconnaissance (UK, colloq., pronounced recky).
RECD Received.
receiver autonomous integrity monitoring Can detect a
satellite malfunction if five satellites are in view, and can
identify the failed satellite if six are in view, thus meeting
requirement for sole means of oceanic navigation.
reception All arrangements for receipt of air drop.
recession Linear rate at which ablating material is
eroded, normally measured normal to local surface.
Rechlin Location near Neubrandenburg of largest and
oldest German aircraft/air armament test establishment
before 1945.
reciprocal Heading 180° from previous heading, or from
that intended.
reciprocal bearing Bearing of observer from remote
station.
reciprocal latching Use of phase-shifters to generate
computer-controlled sequence and distribution pattern
for electronically scanned radar transmission.
reciprocating engine One in which piston(s) oscillate to
and fro in cylinder, eg Otto, diesel, Stirling, etc.
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