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Rapide
for near-immediate deployment to distant trouble spot.
American RDF includes armour, air and naval power.
Rapide Reliability and performance in demonstrated
engines.
rapid engineer deployment Quick-reaction civil-engineer
squadrons that provide heavy construction and repair
capability for theatre commander (USAF).
rapid-extraction parachute One designed to deploy in
less than 0.5 s from initial mechanical or electrical signal,
eg for lo-alt delivery or crew escape at minimum altitude.
rapid-fracture surface That left by high-rate crack propagation,
showing as dark (often arrowhead) zones
separated by bright zones of slow fatigue failure.
rapid-intervention vehicle Fast off-road vehicle, first at
scene of crash on or near [usually military] airfield,
equipped to rescue crew.
rapid prototyping Standard life-cycle method of software
development.
rapid pucker-factor take-off One on a favourable unbalanced
field.
rapid-reload capability Ability of single ICBM silo or
SLBM tube system to fire at rapid rate; not defined in
SALT II but generally taken as more than one round per
24 h. Note: in West, no reload missiles exist.
Rapids 1 Radar passive identification system.
2 Real-time acquisition and processing integrated data
system [satellite ground station].
Rapnet Regional air-traffic service packet-switched
network.
RAPP Recognized air-picture production.
Rapport Rapid alert programmed power-management
of radar targets.
RAPPS Remote-area precision positioning system.
RAPS, Raps 1 RPV advanced payload system(s)
(USAF RPV ECM).
2 Radar prediction, or protection, system.
3 Recording, analysis, playback and simulation [radar
data].
4 RPV autoland position sensor.
Rapsat Ranging and processing satellite.
RAPT, Rapt 1 Radar procedures trainer.
2 Recognized air-picture troop.
Raptor Responsive aircraft program for theater
operations [USAF UAVs, not connected with name of
F-22].
RAPTR, Raptr Resonant antenna pulsed transient radiator
(AFRL).
RAR 1 Request radar blip identification (RBI) message.
2 Radar arrival route.
Rara, RARA Reusable active RF augmentation.
RARDE Royal Armament Research & Development
Establishment, (Fort Halstead, Sevenoaks and Chertsey,
UK).
rare-earth General adjective for electric machines using
** magnetic materials, notably SmCo.
rarefaction Supersonic flow through diverging duct, in
which pressure decreases while velocity increases.
Rareps Radar [weather] reports.
RARF Radar, antenna and RF, integrated system in
which multiple radar functions are performed with single
electrically scanned aerial on time-shared noninterference
basis (Emerson).
RARO Remote aerial refuelling operator, or operation.
RARS 1 Radar recording system.
rate
2 Ram-air recovery system.
RAS 1 Rectified airspeed, see airspeed.
2 Rough air speed, for flight through gust (2).
3 Replenishment at sea.
4 Radar-absorbing, or absorbent, structure.
5 Remote active spectrometer.
6 Radar Advisory Service; A adds Area.
7 Row address strobe.
8 Runway alert system.
9 Royal Astronomical Society [office, Burlington Ho,
London W1V 0NL] (UK).
RASA 1 Russian Aviation and Space Agency.
2 See RAS6.
RASC Regional AIS system centre.
Rascal 1 Responsive-access, small-cargo, affordable
launch (Darpa).
2 Ramjet, small-calibre.
3 Radar do scoperta e controllo aereo locale (shortrange
air surveillance) (I).
RASD Requirements and system definition.
Rasda, RASDA Replicated air support decision aid.
RASE Rapid automatic sweep equipment (ECM).
RASER, Raser Revolutionary aerospace engine
research (NASA).
RASH Rain showers.
RASI, Rasi Radar and navaid simulator.
RA/SI Rate alarm/storm intensity (thunderstorms).
RASM Revenue per aircraft, or available, seat-mile.
RASN Rain and snow (ICAO).
Rasos, RASOS Regional Aviation Safety Oversight
System, a Coscap group for Central America (ICAO).
Rasp, RASP 1 Recognized air and surface picture.
2 Radar Applications Specialist Panel (Eurocontrol).
3 Rapid-acquisition spectrum processor.
Raspberry ripple Colour scheme [red/white] of training
and research aircraft (RAF/RN/Qinetiq).
RASS 1 Rapid area supply/support (USAF).
2 Radio acoustic sounding system.
3 Radar analysis support system.
Rast, RAST 1 Recovery assist, secure and traverse
(shipboard helicopter).
2 Radar-augmented sub-target.
3 Replacement aerial subsonic target.
Rastas Radiating site and target acquisition system
(airborne ECM).
raster Generation of large-area display, eg TV screen,
by close-spaced horizontal lines scanned either alternately
or in sequence.
raster scan See scan.
RaSTI Rapid speech transmission index.
Rasur Radio surveillance for intelligence purposes.
RASV Reusable aerospace vehicle.
RAT 1 Ram-air turbine.
2 Ram-air temperature.
3 Rock abrasion tool (Martian exploration).
4 Radar active target.
Rat Hostile intruder aircraft flying alone.
Rata, RA/TA Resolution advisory/traffic advisory.
RATC Radar air-traffic control [C adds centre, F
facility].
Ratchet Rapid ATC HMI evaluation tool.
ratcheting See roll *.
rate Rate of change, first derivative of variable with
respect to time; thus angle *, * gyro. Symbol is dot placed
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