"Hypersonic flight the next frontier for the Air Force" Topic
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| Tango01 | 28 Jun 2015 10:53 p.m. PST |
"Almost 70 years after Chuck Yeager and the Bell X-1 team broke the sound barrier, the Air Force is working to defy the next frontier in speed: hypersonic travel. Defined as anything traveling above Mach 5, hypersonic flight usually clocks in between 3,800 and 4,000 miles per hour — fast enough to traverse the continental United States in about a half an hour. Humans have reached those speeds before. NASA's X-15 program in the 1960's was able to reach speeds of Mach 5. And the Space Shuttle — while reentering the Earth's atmosphere and essentially free-falling from orbit — is estimated to reach speeds of Mach 25…"
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