Word: 15s
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Dates: during 1960-1969
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...single combustion chamber in White's X-15 was rated at 57,000 Ibs. of thrust-as against a total of 16.000 Ibs. for the four chambers of earlier X-15s engines. For a few seconds it generated 70% of its rated thrust, and White thrilled to its surge. Then he throttled back to a more prudent 50% and put the X-15 into a 30° climb. When he reached level flight at 75,000 ft., the X-15 spurted ahead. White slipped it sideways and wiggled its rudder to test control-and the strange airplane responded precisely...