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impeller is a ring of stationary vanes
called a diffuser ring.
ripcord ripcord /rpkɔd/ noun a cord that is
pulled to release a parachute from its
pack and open it
RIS RIS abbreviation radar information
service
rise 198
rise rise /raz/ noun 1. an increase
a rise
in temperature 2.  to give rise to to
cause
Hills and mountains may give
rise to particularly severe turbulence. 
verb 1. to move upwards
air rises 2. to
increase
The temperature is rising.

raise
risk risk /rsk/ noun the possibility of suffering
harm or injury, danger
When
starting an engine, it is bad practice to
pump the throttle lever as there is a risk
of fire in the carburettor air intake. 
verb to take a dangerous chance  to
risk the lives of passengers to put the
lives of passengers in danger by taking
a particular course of action
rivet rivet /rvt/ noun a type of metal bolt
or pin with a head on one end, inserted
through one of the aligned holes in the
parts to be joined and then compressed
on the plain end to form a second head

Tensile or compressive loading makes
the joined materials tend to slide and
break the rivet or bolt.  verb to join
with rivets
The skin is riveted to both
stringers and frames.
RMI RMI abbreviation radio magnetic indicator
RNAV RNAV abbreviation area navigation
robot pilot robot pilot /rəυbɒt palət/ noun
same as autopilot
rocker arm rocker arm /rɒkə ɑm/ noun part of
the valve mechanism in an internal
combustion engine, which transmits the
movement of the pushrod to the valve
rod rod /rɒd/ noun a thin straight piece of
metal
Aluminium rods and bars can
readily be employed in the high-speed
manufacture of parts.
rogallo rogallo /rɒ|$ləυ/ noun a fabric-covered
delta-shaped wing that can be
folded compactly, used on ultralight aircraft
role role /rəυl/ noun function
Movement
of air plays a major role in the development
of weather patterns.  the role of
the aircraft the type of operation the
aircraft is required to perform
roll roll /rəυl/ noun 1. a rotation about the
longitudinal axis of the aircraft, created
by movement of the ailerons
Roll is
produced by moving the stick to the left
or right.
bank 2. a flight manoeuvre
with 360° rotation about the longitudinal
axis of the aircraft
Loops and rolls
are aerobatic manoeuvres.  verb to
rotate the aircraft around its longitudinal
axis
Move the control column to
the left to roll the aircraft to the left.  to
roll into a turn to roll or bank the aircraft
so that it turns left or right
By
rotating the yoke the ailerons are moved
and the aircraft rolls into a turn.
COMMENT: The difference between
roll and bank is that roll is movement
whereas bank suggests a fixed
attitude of the aircraft. Consequently, a
turn might be expressed in angles of
bank: turn at a bank angle of 30°, and
the movement to obtain the bank
might be expressed as roll: roll the
aircraft to the left.
roll cloud roll cloud /rəυl klaυd/ noun cloud
created in the rotor zone on the downwind
side of mountain ranges
roller roller /rəυlə/ noun a cylindrical metal
device which rotates
The most common
bearings used in gas turbine
engine are the ball or roller type.
RON RON abbreviation remain overnight
root root /rut/ noun  the root of the
problem the cause of the problem
rose rose /rəυz/ noun  compass rose the
compass card or its marking of 32
points on a map
An arc of the compass
scale, or rose, covering 30° on either
side of the instantaneous track, is at the
upper part of the display.
rotary rotary /rəυtəri/ adjective rotating 
rotary motion rotating movement
rotary actuator rotary actuator /rəυtəri
ktjuetə/ noun an actuator which
rotates and operates a screw jack, e.g. to
extend flaps
rotary inverter rotary inverter /rəυtəri n|v%tə/
noun a DC motor driving an AC generator,
the output of which must be regulated
to give constant voltage and frequency
rotary wing aircraft rotary wing aircraft /rəυtəri wŋ
eəkrɑft/ noun an aircraft with a rotor
which provides lift, such as a helicopter
rotate rotate /rəυ|tet/ verb to turn around
　
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