|National origin||United States|
|Primary user||United States Army|
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. 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. 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.
35 production SD-2s were produced; poor results of the navigation system resulted in the system's cancellation in 1966, and the program was terminated without any Overseers having seen operational service. In 1963, the SD-2 was given the designation MQM-58A under the revised designation system.
Data from Jane's All The World's Aircraft 1965–66
- Crew: None
- Length: 16 ft 1 in (4.9 m)
- Wingspan: 13 ft 4 in (4.06 m)
- Height: 3 ft 7 in (1.09 m)
- Wing area: 27.8 sq ft (2.58 m2)
- Aspect ratio: 6.4
- Gross weight: 992 lb (450 kg)
- Max takeoff weight: 1,124 lb (510 kg) without boosters; 1,334 lb (605 kg) including boosters
- Powerplant: 1 × Lycoming LIO-360-B1B horizontally opposed piston engine, 225 hp (168 kW)
- Maximum speed: 345 mph; 300 kn (556 km/h)
- Combat range: 115 mi; 100 nmi (185 km)
- Endurance: 45 minutes
- Service ceiling: 20,013 ft (6,100 m)
- 234 lb (106 kg) equipment capacity.
- Parsch 2002.
- Newcome 2004, p.74.
- Taylor 1965, p. 351.
- Newcome, Lawrence R. (2004). Unmanned Aviation: A Brief History of Unmanned Aerial Vehicles. Reston, Virginia: American Institute of Aeronautics and Astronautics. ISBN 978-1-56347-644-0.
- Parsch, Andreas (2002). "Aerojet General SD-2/MQM-58 Overseer". Directory of U.S. Military Rockets and Missiles. designation-systems.net. http://www.designation-systems.net/dusrm/m-58.html. Retrieved 2014-05-14.
- Taylor, John W. R., ed (1965). Jane's All the World's Aircraft, 1965-1966. London: Sampson Low,. Marston & Company Ltd..
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