Martin Marietta Model 845

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Model 845
Role Communications relay drone
National origin United States
Manufacturer Martin Marietta
First flight April 1972
Primary user United States Air Force
Number built 3[1]

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,[2] however it failed to meet the Air Force's requirement of a 40,000 feet (12,000 m) service ceiling.[1] In 1973 The Model 845A was cancelled (along with the XQM-93), the program being replaced by Compass Cope.[3]

Specifications (variant)

Data from [2]

General characteristics

  • 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 (241 km/h; 130 kn)
  • Endurance: 28 hours

See also

Related development

Aircraft of comparable role, configuration and era

Related lists


  1. ^ a b Aviation Week & Space Technology, Volume 98 (1973), page 67
  2. ^ a b Parsch, Andreas (2004). "Martin Marietta 845A". Directory of U.S. Military Rockets and Missiles Appendix 4: Undesignated Vehicles. Designation-Systems. Retrieved 2017-11-09.
  3. ^ 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.

External links

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