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oll rate
muscular input [but emphatically not PIO], force-sensing
stick gain and command prefiltering.
roll rate Measures of lateral-control power, notably
instantaneous * and sustained *.
roll-rate gyro A single gyroscope used to measure rate of
roll of its cage, or aircraft.
roll reversal Causes, apart from basic aeroelastic
reversal of control, include jack stall, spoiler blowback,
adverse yaw and loss of lift of accelerated wing due to
increased compressibility.
Rollspring Patented (Lockheed Georgia) mechanical
drive using belt of thin spring steel.
roll-stabilized Prevented, eg by autopilot or vertical
gyro, from rolling; common characteristic of cruciformwinged
missiles as an alternative to deliberate roll at
known rate.
roll whiskers Short diagonal lines showing bank-angle
limits (HUD symbology).
rolometer Extra-sensitive bolometer (ASCC).
ROM 1 Read-only memory.
2 Rough order of magnitude (prefix).
Romag Remote map generator.
Rome Convention International laws governing liability
for, and compensation for, damage to Earth surface,
especially structures, caused by aircraft (1952).
RON 1 Receive, receiving, only (ICAO).
2 Remain overnight (FAA).
3 Research octane number (fuel).
Ronchi Modification of Schlieren technique to give
quantitative results, with second slit removed and grid of
parallel wires added to give light/dark shadow planes.
Roncz Family of [originally sailplane] aerofoils, designations
prefixed RQW for wing, RQHT/RQVT for
horizontal or vertical tail.
Ronk Resident officer in charge (USN, colloq.).
Ronly Receiver only.
röntgen See roentgen.
roofline Generalized term for that level in passenger
cabin at which lights, fresh-air (punkah) louvres, call
buttons and drop-down oxygen are located. Hence *
locker = overhead stowage bin.
roof rat Carrier deck crew (USN colloq.).
rooftop Aerofoil profile which at typical cruise AOA
generates lift more or less uniformly across large middle
part of chord (chordwise plot has semi-elliptic form). Not
precisely defined and generally synonymous with supercritical.
roof watcher Person trained in aircraft recognition
stationed on roof of factory, school or similar building to
give warning of imminent attack (UK, 1941–45).
root 1 Junction of aerofoil with fuselage or similar
supporting structure, including unspecified small innermost
portion of aerofoil itself.
2 Inner end of propellor or gas-turbine compressor or
turbine blade [vane].
root attachment Method of fixing rotating blades into
the disc periphery. Turbine rotor blades are invariably
held by a fir-tree. Compressor rotor blades are usually
retained either by being slid into axial slots across the disc
periphery or retained in a slot around the disc circumference,
in each case with locking devices.
root bending moment Bending moment at the wing root,
strongly influenced by lift generated near the tip,
especially by an increase in span.
Rossby number
root chord Chord of a wing or tail surface at the root or
[and this must be made clear] on aircraft centreline.
root mean square Square root of arithmetic mean of
squares of all possible values of given function.
root-mean-square error Square root of arithmetic mean
of squares of deviations from arithmetic mean of whole;
standard deviation σ.
Roots One of many types of positive-displacement fluid
compressors (eg superchargers, cabin blowers) in which
two mating rotors are driven by external gears to revolve
together inside casing; rotors in this case are identical and
resemble fat figure-eights.
root section Profile of aerofoil at root; in both wings and
propellers often significantly different from remainder of
surface.
ROP 1 Rotor overspeed protection.
2 Runway observation post, for human guess at RVR.
3 Runway overrun protection.
ROPA Reserve Officers Personnel Act (ROPMA adds
‘Management’) (US).
Ropar Regional operators’ program for airframe reliability;
co-operative effort by US carriers.
rope Element of chaff consisting of long roll of metallic
foil or wire designed for broad low-frequency response.
rope chaff Chaff which contains one or more rope
elements (DoD).
ROPW Read-only, permanently woven memory.
ropy Or ropey, general critical/derogatory adjective and
adverb (RAF WW2).
ROR 1 Range-only radar.
2 Rocket on rotor.
3 Red on red.
Ro/Ro Roll-on roll-off, ship configured for transport of
vehicles driven on or off under own power. See T-AKX.
Rorsat Radar ocean-reconnaissance satellite.
ROS 1 Rotor outside stator (electrical machines).
2 Read-only storage.
3 Relief on station (UAVs).
4 Rosman, North Carolina.
5 Repaired, or repairable, on site.
6 Rotating oil separator.
Rosa 1 Runway, or road and runway, surface analyser.
2 Radar open-system architecture.
rose Polar plot, normally subdivided from 000° to 360°
clockwise but often including only quadrantal, cardinal
and possibly other points and occasionally only radial
lines with variable angular intervals. Term applies to any
such diagram, eg in panel instrument (ADF, RMI, HSI
etc), compass or wind *.
rosette 1 Standard series of patterns, generally resembling
petals of flower, for applying strain gauges to signal
stress in all directions, usually in sheet.
2 Similar-shaped hand weld made in hole through sheet
or tube to secure second member inside.
Rosina Rosetta orbitar spectrometer for ion and
neutron analysis.
Rosman See Stadan.
Rossby chart Basic diagram assisting in establishing
character of air masses and in met. forecasting generally;
energy diagram in which specific humidity is plotted
against equivalent potential temperature, result being
named characteristic curve.
Rossby number Ratio of inertial forces to Coriolis forces
in a rotating fluid.
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