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  • Boeing 273 / XF7B-1

    Designed to meet the requirements of a US Navy specification issued on 6 December 1932, the XF7B-1 (Model 273) was the first all-metal cantilever low-wing monoplane single-seat fighter with a retractable undercarriage, and powered by a Pratt & Whitney SR-1340-30 engine rated at 550hp at 3050m.