XO-4
Role Observation
National origin United States
Manufacturer Glenn L. Martin Company
Status Canceled
Number built 0

The Martin XO-4 (Model 71)[1] was a proposed observation aircraft designed by the Glenn L. Martin Company.[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.[3][5]

References

  1. ^ Stemp, P. D. (2014-08-02). Kites, Birds & Stuff - Aircraft of the U.S.A. - MARTIN Aircraft. Lulu.com. ISBN 978-1-291-94064-0.
  2. ^ Duell, Sloan and Pearce (1947). The Official Pictorial History of the AAF. United States Army Air Forces Historical Office.
  3. ^ a b Air Service Information Circular. Director of Air Service. 1923.
  4. ^ "O - Observation Aircraft". 2007-03-16. Archived from the original on 2007-03-16. Retrieved 2020-06-15.
  5. ^ "USAF Serial Number Search Results". cgibin.rcn.com. Retrieved 2020-06-15.