The North American Aviation X-15A-2 56-6671 ignites the XLR99 engine after being released from the mothership, Balls 8, 3 October 1967. (U.S. Air Force)
North American Aviation X-15A-2 56-6671 engine ignition, 3 October 1967
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Can you elaborate on the thrust increased gradually and the x15 continued to accelerate forward