Boeing’s Model 299 was designed and built at the company’s expense to meet the specifications contained in a 1934 US Army Air Corps (USAAC) proposal for a multi-engine bomber to replace Martin’s B-10. The design was to be able to carry what the Air Corps referred to as a useful bomb load to an altitude of 10,000 feet for ten hours duration.  The Air Corps also specified a top speed of no less than 200 miles per hour. The USAAC wanted the aircraft to be able to operate from such…

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