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amp-to-ramp
ramp-to-ramp See block time.
ramp up To increase (US).
ramp weight, MRW Maximum weight permissible for
aircraft, equal to MTOW plus fuel allowance for main
engines and APU for start, run-up and taxi.
ram recovery Pressure actually achieved in ram inlet,
expressed as absolute value or as percentage of total available
dynamic pressure.
ramrocket Important species of propulsion system for
unmanned vehicles, comprising rocket (solid, liquid or
hybrid) and integral ramjet propulsion. Vehicle is
launched by rocket, at conclusion of whose burn at supersonic
speed nozzle is jettisoned, leaving larger con-di
nozzle, air inlet is extended or opened and ramjet
operation takes place with combustion of liquid or hybrid
type in original solid motor case and chamber (see ducted
rocket).
Ramrod Day attack by bombers escorted by fighters
with primary objective destruction of target (WW2).
RAMS, Rams 1 Remote automatic multipurpose
station.
2 Removable auxiliary memory set.
3 Rapid assembly of munitions system, refined procedures
for assembling munitions over sustained period
(USAF).
4 Reliability, availability, maintainability and safety.
5 Reorganized ATC mathematical simulator (Eurocontrol).
6 Regional atmospheric modelling system.
Ramsbottom A standard procedure for determining
carbon residue left after combustion of lubricating oils.
Ramses 1 Radar mode-S evaluation system.
2 Reduced acoustic mode scattering engine system.
ram’s horn 1 Pilot flight-control yoke generally resembling
ram’s horn, more upright than spectacles.
2 Microwave aerial of spiral (usually exponential)
form.
RAMU Removable auxiliary memory unit.
ram void pressure Achieved pressure (pressure recovery)
inside inlet duct, esp. at supersonic speed; ratio
**/freestream total pressure is function controlling dump
doors on SSTs.
ram wing Vehicle designed to fly in ground effect;
arguably synonymous with ekranoplan.
ram yoke Carrier, usually one of a pair, for AAM,
powered by cartridge to separate missile under peak
negative-g conditions.
RAN 1 Regional Air Navigation panel (ICAO).
2 Radio Access Network [2005–] (Int.).
3 Royal Australian Navy.
RANC Radar attenuation, noise and clutter (US,
DNA).
RAND From ‘research and development’, pronounced
Rand, non-profit institution [Santa Monica,
CA90407–2138] (US).
R&A Report and accounts.
R&C Rolled and coined.
R&D Research and development.
R&E Radio and electronic, as distinct from A&E.
R&M 1 Reports and memoranda (UK).
2 Reliability and maintainability (US).
R&O Repair and overhaul.
random access Ability of computer memory to
remember contents and addresses of all memory stores
range/azimuth display unit
immediately; access time is independent of location of
preceding record.
random-demand planning Planning for supplies necessitated
by in-service failures.
random energy That of fluid particles in disordered
motion, rapidly degrading to heat, eg downstream of
shock.
random error Unpredictable, caused by short-period
disturbances in system or in measuring method, normally
having Gaussian distribution over period; excludes major
failures, human errors and errors of systematic nature.
random flight Unplanned local flight by light aircraft,
esp. one without radio.
random R-nav routes Direct routes making full use of
R-nav capability.
random scatter See scatter (1).
R&QA Reliability and quality assurance.
R&R 1 Routeing and record.
2 Rest and recreation, or Rest and recuperation.
3 Recovery and repair.
4 Repair and return.
Rands Range, nose, distance, speed.
R&SU Repair and Servicing Unit (RAF).
R&T Research and technology [A adds acquisition].
range 1 Distance aircraft can travel, under given conditions,
without refuelling in flight. By itself has little
meaning, except for very small, simple aircraft.
Maximum-fuel * normally taken to mean IFR reserves for
multi-engine aircraft, VFR for single. Calculations for
military aircraft traditionally assume external tank(s)
retained, ammunition not fired, includes distance during
climb but not fuel for warm-up, takeoff or reserve.
Definitions of what constitute short- *, ultra-long * etc,
have never ceased to proliferate, but may soon firm up.
One formula is R=W f V/c´F where W f is mass of fuel [in
practice, of usable fuel], V is TAS, c´ thrust sfc and F net
propulsive force. See Breguet.
2 Limiting distance, over intercontinental * measured
as great circle, missile, RPV or other unmanned vehicle
can travel with specified load and following specified
flight profiles.
3 Distance between observer or weapon launch point
and target.
4 Land and/or water area equipped and designated for
vehicle testing, esp. missile, UAV or RPV, or testing
ordnance or practice shooting at targets.
5 Difference between upper and lower limits for
variable, eg frequency or wavelength coverage of receiver,
pitch of propeller blades or many other variables.
6 To organize aircraft on carrier flight deck into desired
sequence with closest packing.
range ambiguity In several early radio navaids, eg radio
range, possibility of flying reciprocal or obtaining
misleading distance indication.
range analog bar Horizontal bar appearing in some
optical, HUD or radar sight displays once full lock-on has
been achieved, its length showing range.
range and bearing launch Missile has these parameters
preset, flies on bearing and at last possible moment
switches on radar seeker to acquire target.
range attenuation Inverse-square decrease in radar
power density with range.
range/azimuth display unit Various instruments, esp.
HSI giving VOR/DME information.
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