XB-70 Valkyrie accelerates to Mach 3.02
The mammoth XB-70 Valkyrie achieved its design speed Oct. 14, 1965 when it accelerated to Mach 3.02, or 2,000 mph at 70,000 feet altitude over Edwards Air Force Base, Calif. The aircraft weighed 500,000 pounds. (Courtesy photo)
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