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ocket ammunition
monopropellants (eg HTP) and pressurized boiling water
(eg Pohwaro).
2 Verbal or written reprimand (UK, colloq.).
rocket ammunition Rocket-powered projectiles of relatively
small size fired from aircraft or other platform,
mobile or stationary (USAF). Unguided, normally finned
and/or spin-stabilized.
rocket artillery Artillery in which projectiles are
propelled by rocket power but given guidance only during
launch by amount of thrust and direction of take-off
(USAF). This definition is meant to cover tube-type
airborne launchers.
rocket-assisted take-off Take-off in which horizontal
acceleration, and usually vertical component of thrust,
are augmented by one or more rockets which may form
part of aircraft or be jettisoned when spent. Ambiguously
given US term JATO.
rocket/athodyd See ram rocket.
rocket-based combined cycle Rocket with valvecontrolled
duct to scramjet.
rocket cluster Large group of parallel rockets normally
all fired together.
rocket engine Term best reserved for rocket using liquid
propellants, esp. with pump feed and control system.
rocket fuel Ambiguous; can mean fuel as distinct from
oxidant, or a solid propellant.
rocket grain See grain.
rocket igniter Device for starting combustion in any
form of rocket; usually an electrically fired pyrotechnic,
but many contrasting varieties.
rocket launcher Anything for launching rockets, specif.
aircraft pod, pylon or rail from which rocket ammunition
is fired.
rocket loop Flight manoeuvre in which loop is made
with excess initial speed, traded in loop for height.
rocket motor Term preferred for all solid-propellant
rockets, of any size, together with hybrids of modest
complexity.
rocket on rotor Method of temporarily greatly boosting
helicopter lifting power by switching on tip-drive jets fed
with HTP from tank above hub.
rocket power See rocket propulsion.
rocket propellant See propellant.
rocket propulsion Propulsion of vehicle by rocket,
excluding rocket drive of gyro wheels, turbopumps and
other shaft-output devices.
rocketry Technology of rockets (colloq.).
rocket sled Sled guided by straight track and propelled
by rocket(s) to high (often supersonic) speed for use as test
platform.
rocketsonde Launched by rocket, operates on parachute
descent.
rocket thrust Measured either for sea-level or vacuum
conditions, latter being about 26% greater.
rocking Uncommanded lateral and directional oscillation,
chiefly in roll.
rockoon Sounding rocket fired from helium balloon.
rockover Nose-down rotation on landing, normally by
tailwheel aircraft, in extreme case by 180°.
Rockwell number Measure of hardness, esp. of metals,
derived by impressing tool (for soft metals Type B,
1
/16-in/1.5875 mm steel ball, result being R B number; for
very hard Type C, 120° diamond cone, result R C number)
roll
first with 10 kg load and then with 90 or 140 kg, and
measuring change in indent area.
Rococa Rate of change of cabin altitude.
ROD 1 Rate of descent.
2 Repair on demand.
rod Photoreceptor in retina for scotopic (night) vision
and detection of movement.
rod aerial Aerial in form of rigid tube or bar conductor.
Rodar Helicopter rotor-blade radar (Ferranti).
Rodeo Code name for sweep over enemy territory by
fighters, on preplanned and opportunity targets (RAF,
WW2).
Rodnet Reliable on-board data network.
Rods, RODS 1 Robust optical data system.
2 Ruggedized optical-disk system.
ROE, RoE 1 Rules of engagement.
2 Return on equity.
ROEA Read-only, electrically alterable memory.
roentgen Unit of exposure to ionizing radiation, quantity
producing 1 e.s.u. in 1 cm 3 dry air at 0°C; non-SI, =
2.58 × 10 -4 C/kg (C = coulombs).
roentgen equivalent man See rem.
ROF 1 Royal Ordnance Factories (UK, at one time
various locations).
2 Rate of fire.
3 Rollover force, imposed by aircraft wheel.
Rofor, ROFOR Route forecast.
Rogallo Originator of patented family of flexible-wing
aircraft characterized by delta wing plan with three rigid
members in form of arrow-head joined by flexible fabric
which inflates upwards to arch under flight loads;
originally paragliders with poor L/D, later developed to
include powered aircraft.
Roger Voice code: “I have received and understood all
of your last transmission”.
rogue Aircraft which displays flight characteristics
and/or performance markedly inferior to others of same
type or, in particularly dangerous specimens, which is
unpredictable.
rogue state Country considered by the USA/UK to pose
a possible NW threat.
Rohacell Low-density cellular plastics material of
thermosetting type used to stabilize sandwich structures,
usually with CFRP skins.
Rohrbond Patented metal adhesive bonding, especially
for noise-absorbent sandwich.
ROI Return on investment.
Roink See Ronk (USN).
ROL Roll-on landing.
Rolamat Proprietary series of floor roller panels to facilitate
loading and para-dropping of cargo.
Role, ROLE Receive only link eleven (Link 11,
US/NATO).
role-change package Removable equipment fit (eg
flight-refuelling probe installation) stored available for
use when required; does not necessarily change role.
role equipment Equipment attached to or carried in
aircraft for particular duties or mission(s) which can be
removed subsequently; eg helicopter can offload ASW
gear or anti-tank weapon/sight system and take on winch,
buoyancy bags and furnishing for rescuees.
roleur Non-flying taxi trainer (F, suggest obs.].
roll 1 Rotation about longitudinal (OX) axis; one of the
five classical modes of aeroplane motion.
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