The North American XB-70 Valkyrie was the prototype for a supersonic bomber that was never built, but the two test aircraft that were constructed were used by NASA from 1966 to 1969 for a series of tests in support of better understanding supersonic flight with larger airplanes, including the proposed U.S. supersonic transport (SST) airliner that was never built due to environmental concerns related to noise.
NASA
The North American XB-70 Valkyrie was the prototype for a supersonic bomber that was never built, but the two test aircraft that were constructed were used by NASA from 1966 to 1969 for a series of tests in support of better understanding supersonic flight with larger airplanes, including the proposed U.S. supersonic transport (SST) airliner that was never built due to environmental concerns related to noise.Read More