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It could reach a top speed of 4,520 miles per hour (7,274 km/h), or Mach 6.72. During the X-15 program, 13 flights by eight pilots met the Air Force spaceflight criterion by exceeding the altitude of 50 miles (80 km), thus qualifying these pilots as being astronauts.
But it wasnât until the 1960s that scramjets were actually tested in the lab. To date, NASA still holds the scramjet speed record for its X-43a experimental aircraft which achieved Mach 9.68 on November 16, 2004. X-51A Waverider, U.S. Air Force graphic (Credit: Wikipedia) âCompared to a Boeing 747, if you look at designs for hypersonic aircraft they really donât have very much wing surface area at all,â said Goyne.