Chuck Yeager Quotes
At 42,000' in approximately level flight, a third cylinder was turned on. Acceleration was rapid and speed increased to .98 Mach. The needle of the machmeter fluctuated at this reading momentarily, then passed off the scale. Assuming that the off-scale reading remained linear, it is estimated that 1.05 Mach was attained at this time.
Citations
Yeager, Charles E. Report of Flight No. 50. Bell XS-1, Air Materiel Command, 14 Oct. 1947.
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Charles Elwood Yeager was a United States Air Force officer, flying ace, and record-setting test pilot who in 1947 became the first pilot in history confirmed to have exceeded the speed of sound in level flight.