The Martin XO-4, company Model 71, was a proposed observation aircraft designed by the Glenn L. Martin Company to compete with the Curtiss XO-1, Douglas XO-2 and Dayton-Wright XO-3. It was to be powered by a Wright T-3 Tornado or a Liberty V-1650 engine. Although it failed to win a contract from the United States Navy, the United States Army Air Service ordered a single prototype with the serial number 23-1255, but that contract was cancelled before the prototype could be built, so the XO-4 remained a design that never flew.
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Source Martin XO-4 (Wikipedia)
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Source Martin XO-4 (Wikipedia)Lead, body styleQuote, Lead, body style
was a proposed observation aircraft designed by the Glenn L. Martin Company
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a single prototype (allocated the serial number 23-1255) was ordered by the United States Army Air Service
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1. Martin XO-4 (Wikipedia)
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but this contract was canceled before the prototype could be built
Lead, body style
was a proposed observation aircraft designed by the Glenn L. Martin Company
Lead, country of origin
a single prototype (allocated the serial number 23-1255) was ordered by the United States Army Air Service
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