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Aerojet SD-2 Overseer
The Aerojet SD-2 Overseer was an unmanned aerial vehicle developed by Aerojet General in the late 1950s for use by the United States Army. Built in limited numbers, it never saw operational service.
==Design and development==
Development of the SD-2 drone was begun in 1957 by the Rheem Manufacturing Company; in 1959, the company was acquired by Aerojet General, who continued work on the project.〔Parsch 2002.〕 Developed as part of the AN/USD-2 surveillance system, the SD-2 was designed for truck launch using two solid rocket boosters; following launch, a piston engine provided propulsion. At the end of its mission, the drone would be recovered via parachute.〔 Control was provided from a translateration system for navigation, which allowed the aircraft to steer on a pre-programmed course.〔Newcome 2004, p.74.〕
The SD-2 was designed to use a modular sensor system, allowing equipment to be switched between missions according to requirements. Available payloads included cameras for either recovered or real-time photography, an AN/AAD-2 infrared sensor, AN/DPD-2 side looking airborne radar, or equipment for the dispensing of biological or chemical warfare agents from tanks mounted under the wings of the aircraft.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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