| XO-4 | |
|---|---|
| Role | Observation
Type of aircraft
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| National origin | United States |
| Manufacturer | Glenn L. Martin Company |
| Status | Canceled |
| Number built | 0 |
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.[3][5]
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Martin and Martin Marietta aircraft
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1 Unconfirmed | |||
