|Role||Communications relay drone|
|National origin||United States|
|First flight||April 1972|
|Primary user||United States Air Force|
The Martin Marietta Model 845 was a remotely piloted aircraft developed in the United States in the late 1960s and early 1970s for use as a communications relay in the Vietnam War.
Two prototypes were built as part of the United States Air Force's Compass Dwell program, these machines also being based on a Schweizer SGS 1-34 sailplane and similar in configuration to the competing XQM-93 design by Ling-Temco-Vought. Test flights began in April 1972; during testing, one of the prototypes stayed aloft for almost 28 hours, however it failed to meet the Air Force's requirement of a 40,000 feet (12,000 m) service ceiling. In 1973 The Model 845A was cancelled (along with the XQM-93), the program being replaced by Compass Cope.
Data from 
- Crew: None
- Length: 25 ft 4.75 in (7.7407 m)
- Wingspan: 59 ft 1.25 in (18.0150 m)
- Height: 9 ft 6 in (2.90 m)
- Gross weight: 2,320 lb (1,052 kg)
- Powerplant: 1 × Lycoming TIO-360-A3B6 horizontally opposed piston engine, 200 hp (150 kW)
- Maximum speed: 150 mph (240 km/h, 130 kn)
- Endurance: 28 hours
Aircraft of comparable role, configuration, and era
- Aviation Week & Space Technology, Volume 98 (1973), page 67
- Parsch, Andreas (2004). "Martin Marietta 845A". Directory of U.S. Military Rockets and Missiles Appendix 4: Undesignated Vehicles. Designation-Systems. Retrieved 2017-11-09.
- Robinson, Anthony (1979). The Illustrated encyclopedia of aviation. 8. London: Marshall Cavendish. p. 854. ISBN 978-0856855818.
- This article contains material that originally came from the web article Unmanned Aerial Vehicles by Greg Goebel, which exists in the Public Domain.
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