The Boeing YB-9 (Also known as the Model 214/215/246) was the company's first all-metal bomber design. In 1930, the bomber squadrons operated by the US Army Air Crops mostly consisted of slow biplanes. Boeing had recently built its successful all-metal Monomail trainsport, and wanted to use their experience to build something bigger.
When complete, the YB-9 was able to outrun most conventional fighters at the time, thanks to a light air-frame, sleek design, and powerful engines. Though the Army Air Corps tests looked promising, no large production orders were made as Glen Martin Company had brought out its own design which would go on to become the Martin B-10.
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