Martin XO-4 explained

The Martin XO-4 (Model 71) was a proposed observation aircraft designed by the Glenn L. Martin Company.[1] [2] It was designed to compete with the Curtiss XO-1, Douglas XO-2, and Dayton-Wright XO-3, and was to be powered by a Wright T-3 Tornado or a Liberty V-1650.[3] [4] Although it failed to receive a contract from the United States Navy, a single prototype (allocated the serial number 23-1255) was ordered by the United States Army Air Service, but this contract was canceled before the prototype could be built.[5]

Notes and References

  1. Web site: Martin Aircraft Model Designations, Built and Unbuilt . dead . https://web.archive.org/web/20080517112813/https://marylandaviationmuseum.org/pdf/Models.pdf . May 17, 2008 . Glenn L. Martin Maryland Aviation Museum.
  2. Book: Duell, Sloan and Pearce. The Official Pictorial History of the AAF. 1947. United States Army Air Forces Historical Office. en.
  3. Book: Air Service Information Circular. 1923. Director of Air Service. en.
  4. Web site: 2007-03-16. O - Observation Aircraft. 2020-06-15. https://web.archive.org/web/20070316084632/http://www.personal.psu.edu/users/d/o/dob104/aviation/us/observe.html. 2007-03-16.
  5. Web site: USAF Serial Number Search Results. 2020-06-15. cgibin.rcn.com.

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