Progress is fine, but it's gone on for too long.
with apologies to Ogden Nash...
Wednesday, July 15, 2015
X-15 by North American
The rocket-propelled North American X-15 is launched from a modified B-52. The X-15 achieved speeds of 4500 mph and 354,000 feet altitude in the mid sixties and still holds the speed record. The plane was retired in 1968.
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