Needing to fill the Army Air Corps requirement for a long range, high-altitude, daylight bomber, Boeing developed the then Model 299, powered by four 750hp Pratt & Whitney Hornet engines. When the model crashed after take-off on its second flight, Boeing was technically disqualified from the contract, the but Army continued and ordered later models designated YB-17 and YB-17A. By the end of March 1940, the first production batch of B-17Bs were delivered to the Army Air Corps.
August 21st, 2015
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