The SR-71 was derived from the A-12 Oxcart, a black project also built by Lockheed’s famed “Skunk Works” division for the CIA.
How fast? Test pilot Jim Eastham managed to push one to Mach 3.56, or just under 2,400 mph, for approximately 15 seconds whilst in a dive, as noted by retired U.S. Air Force Master Sergeant Jim ...
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