Mach is the ratio between an object’s speed and speed of sound. So, Mach 1 would be the same as the speed of sound which is 1234 km/h (767 mph). Now, Mach 2 will be twice the speed of sound 2469 km/h (1534 mph).
Mach 10 is 12348 km/h (7672 mph). With this speed, the pilot could travel the width of the U.S. in about 25 minutes, while the modern jets take from 2-4 hours to cross the same distance. A pilot traveling with a speed of Mach 10 will easily reach the pressure of 34 G-force, which is scientifically impossible for a human to withstand, therefore Mach 10 is impossible to reach in a manned aircraft.
The highest Mach reached in a manned aircraft was Mach 6.7. it was achieved by William J. Knight on the 3 October 1967 in the North American X-15 which is a hypersonic rocket-powered aircraft operated by the United States Air Force. The X-15 was flown at an altitude of 102,100 feet (19.34 miles).
The highest Mach ever reached was in 2004 by NASA’s unmanned Hyper-X (X-43A). The aircraft reached Mach 9.6. It flew 36 km (22 miles) in 11 seconds and the altitude of the aircraft was 109,440 feet (20.7 miles).
Reaching higher Mach speeds is possible, but not in a manned aircraft because of enormous gravitational pressure the human body just gives up, while unmanned could have the potential to reach outstanding Mach speeds.
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