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Revi
combat aircraft or other stores against external attack or
to protect occupants, eg launch crew, against hazardous
rocket or similar tests.
Revi Reflexvisier, reflector sight (G).
Revise Research vehicle for inflight submunition
ejection.
revival Restart of spacecraft systems after period of rest
or shutdown, eg after long mid-course en route to planet
when * is commanded by characteristic telecom signal.
rev/min SI abb. for revolutions per minute.
revolution 1 In engineering terms, one rotation of shaft
or rotary system.
2 In spaceflight, motion of body about axis remote
from itself, eg of planet around Sun.
3 One complete orbit starting and finishing at same
point. In practice this is unattainable concept because of
rotation of Earth, Earth’s revolution (2) around Sun,
Sun’s motion through local galaxy, etc. Time for Earthsatellite
revolution, as distinct from period (see sidereal
and synodic orbit), is of meaning only in specif. case where
inclination is 090° or 270° along Equator when, because
of Earth rotation, time is shortened or extended by 6 min.
over orbital period. At all other inclinations satellite
follows fresh track on each orbit and never makes * in this
sense.
Revolutionary Turbine Accelerator Unconventional
scheme for turbofan for flight Mach No of 4.25 (NASA).
revolution indicator Tachometer.
Revolution in Military Affairs Owning the sky and space
over the battlespace; giving unchallengeable command
and control.
revolver cannon One whose ammunition is fed to
chamber via rotary cylinder driven by main action and in
whose several chambers successive rounds pass through
complete firing sequence, in one position being fired down
a single fixed barrel. See rotary cannon.
revPAR Revenue per available room.
revs Revolutions, especially rpm, i.e., engine speed
(colloq.).
REVS, Revs Radar-enhanced vision system (BAE
Systems).
REW Radio-electronic warfare.
Reward Reporting working and reliability data.
REWTS Responsive electronic-warfare training
system.
Reynolds number Most important dimensionless coefficient
used as indication of scale of fluid flow, and
fundamental to all viscous fluids; R = ρVl/μ where ρ is
density, V velocity, l a characteristic length (eg chord of
wing) and μ viscosity = Vl/v where v is kinematic viscosity.
Expression is ratio of inertia to viscous forces. It shows,
eg, that for dimensional similarity model tests in tunnels
should be run at pressures greater than atmospheric.
Reynolds stress 1 Shear stress in laminar boundary layer
in viscous fluid (see skin friction).
2 Term(s) representing momentum transfer due to
turbulence.
RF 1 Radio frequency, or facility.
2 Aircraft designation prefix, reconnaissance/fighter
(DoD).
3 Regional forces.
4 Royal Flight; thus, issue of an * Notam.
5 Route to a fix.
RFA 1 Request for alteration.
RFSP
2 Royal Fleet Auxiliary; ship usually with helicopter
pad.
3 Regulatory Flexibility Act [1980–] (FAA).
RFACA Royal Federation of Aero Clubs of Australia
[office, Melbourne].
RFAS 1 Russian Federation and Associated States.
2 Reaction Force Air Staff (NATO).
RF-ATE RF (1) auto test equipment.
RFC 1 Reinforced fibre composite.
2 RF choke or communication[s].
3 Royal Flying Corps [13 May 1912 (until 1 July 1914
with a Naval Wing) to 1 April 1918, when renamed RAF]
(UK).
4 Request for change, or comments.
5 Retirement for cause (USAF).
6 Radio facilities chart.
7 Reconstruction Finance Corporation (US 1932–56).
RFCM RF countermeasures.
RFCP RF Costs Panel (ICAO).
RFCS RF com. set.
RFD 1 Remote frequency display.
2 Regulatory flexibility determination (FAA).
RFDIU RF/digital interface unit.
RFDS Royal Flying Doctor Service of Australia [office,
Sydney].
RFDU RF distribution unit.
RFEG RF environment generator, to test whole
aircraft.
RFF 1 Research Flight Facility (NOAA).
2 Rescue and firefighting.
RFFE RF front end.
RFFP Rescue and Fire Fighting Panel (ICAO).
RFFS Rescue and firefighting service (CAA).
RFGS RF generation subsystem (ECM).
RFI 1 Request for information.
2 RF interference, or radar-frequency interferometer.
3 Resin-film insulation, or infusion.
RFID, RF/ID Radio-frequency identification, or RF
identification device, initially of passenger or baggage,
now of any item requiring maintenance.
RFIS Receiver fire-control computer-interface software.
RJF, RF/J RF jammer.
RFL 1 Restricted flammable liquid (cargo).
2 Rocket flare launcher.
RFLG Refuelling.
RFM RF module.
RF-Mems RF microelectronic/mechanical system[s].
RFNA Red fuming nitric acid.
RFP 1 Request for proposal[s].
2 Remote front panel.
RFPB Reserve Forces Policy Board (DoD).
RFPI Rapid force projection initiative.
RFPU Recorder/film-processor unit.
RFQ 1 Request for quote/quotation[s].
2 Request for qualifications [airports].
RFR 1 Request for revision.
2 Restriction of Flying Regulation[s].
RFS 1 Reserve Flying School (UK).
2 RF surveillance; /ECM adds and ECM.
3 Restricted flammable solids (cargo).
4 Regardless of feature size.
RFSC Rubberized friction and seal coat (runway).
RFSP Replacement flight-strip printer.
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