As the Cambridge Dictionary reports, supersonic can be defined in quite simple terms: “faster than the speed of sound.” This, too, is a little difficult for those who aren’t versed in the physics of it all to comprehend, so let’s consider what the speed of sound actually is.
It will depend, of course, on the medium that sound is traveling through, but as a base value the speed of sound is 761 mph, or about 1100 feet per second. In aviation, Mach 1 flight is considered breaking the sound barrier, a feat that humanity first achieved almost a century ago. It was the U.S. Air Force’s Chuck Yeager who accomplished flight in excess of Mach 1 (700 mph or 1126.5 kmph) in October of 1947. He was piloting a rocket-powered Bell X-1.
Aviation technology advances very fast indeed. Just six years later, Yeager reached beyond Mach 2 (1650 mph or 2655.4 kmph) in another flight, in a modified version of the history-making craft he flew in 1947. This tops the pace recorded by the Tupolev Tu-144 airliner, but is still some distance from hypersonic flight. As remarkable as supersonic aircraft can be, they’re just the beginning.
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