Hypersonic flight is flight through the atmosphere at speeds above about Mach 5.5, a speed where dissociation of air begins to become significant and high heat loads exist. Hypersonic flight has been achieved by the X-15 rocket planes, the Space Shuttle`s orbiter, the Apollo command module, Buran and scramjets. ==History== The V-2 rocket, first u....
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http://en.wikipedia.org/wiki/Hypersonic_flight
(from the article `supersonic flight`) ...a temperature of 15 °C (59 °F) and sea-level pressure, sound travels at about 1,225 km (760 miles) per hour. At speeds beyond about five times the ...
Found on
http://www.britannica.com/eb/a-z/h/91
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