Phased array Radar in which the beam is scanned electronically in one or both axes without moving the antenna. Port Left side, looking forward. The distance an aircraft can fly from base and return without intermediate landing. RAI Registro Aeronatico Italiano. RAM Radar absorbent material.
Rigid rotor See bearingless rotor.
RVP Remotely piloted vehicle. Ruddervators Flying control surfaces, usually a V tail, that control both yaw and pitch attitude.