Flying Wing!
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Latest at the National Interest is a look at the YB-49:
As the United States approached World War II, it enjoyed the luxury of many innovative aircraft companies, and a ton of money to spend. Part of this bounty went to pursuit aircraft, part to tactical attack planes, and part to long-range bombers. This last generated one of the most interesting failures ever to emerge from the U.S. aviation industry; the Northrop YB-49 “flying wing” bomber.