YB-49 Flying WingNorthrop YB 49 Flying Wing model. The YB 49 was born when Northrop modified two YB 35's to jet power, the first one flying on October 21, 1947. Many complimentary reports on the YB 49 were filed by Air Force officers, and the service was convinced of the advantages of the all wing configuration, but in June 1948 the second YB 49 was destroyed with the loss of its five man crew in a crash attributed to structural failure. In spite of this, the Air
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