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Glossary - R

RAD	Radial
Radar	Radio detecting and ranging
radome	Aerodynamic protective covering over radar or other aerial. Contraction of radar dome.
ramjet	A jet engine similar to a turbojet but with no mechanical compressor or turbine. Compression of the incoming air is accomplished entirely by the vehicle's speed through the atmosphere. The vehicle cannot start from rest, but needs to be accellerated to the ramjet's operating speed by other means, such as assisted take-off aboard another aircraft.
REF	Reference
REQ	Request
RIO	Radar Intercept Officer
RPV	Remotely piloted vehicle
rudder	Movable control surface effecting control in yaw.
ruddervators	Movable flight control surfaces combining the functions of rudders and elevators.
RVR	Runway Visual Range
RVSM	Reduced Vertical Separation Minima
RWR	Radar Warning Receiver
RWY	Runway