The Martin XB-51 was an American "tri-jet" ground attack aircraft designed to a 1945 United States Army Air Forces requirement. It was originally designed as an attack aircraft by the Air Force under specification V-8237-1 and was designated XA-45. The "A" ground attack classification was eliminated the next year, and the XB-51 designation was assigned instead. The requirement was for low-level bombing and close support.
The XB-51 lost out in evaluation to the English Electric Canberra which entered service as the B-57.
Read more about Martin XB-51: Design and Development, Operational History, Specifications (XB-51)
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