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Originally Posted: May 27, 2010The Boeing X51A Waverider, a U.S. Air Force scramjet reached a speed nearly five times the speed of sound today. Which is pretty cool. The aircraft is the size of a cruise missile. The scramjet ignited for about 200 seconds and reached a 70,000-foot altitude at Mach 5, making aviation history with the longest-ever scramjet-powered hypersonic [...] [...]