X 43 Jet - "Mach number" is named after the Austrian physicist Ernst Mach. Mach 1 is the speed of sound, which is approximately 760 miles per hour at sea level. An airplane flying slower than Mach 1 is traveling at subsonic speeds, faster than Mach 1 would be supersonic speeds, and Mach 2 would be twice the speed of sound.
The Pegasus rocket ignites to send the X-43A on its record-breaking flight on November 16, 2004. photo
X 43 Jet
Guinness World Records has recognized the X-43A scramjet with a new jet world speed record: Mach 9.6, or nearly 7,000 mph. The X-43A set a new record and broke its own world record on its third and final flight on November 16, 2004.
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In March 2004, the X-43A set the previous record of Mach 6.8 (almost 5000 mph). The fastest manned air-breathing vehicle, the US Air Force's SR-71, reached just over Mach 3.2. The X-43A more than doubled and then tripled the top speed of the jet-powered SR-71.
The Hyper-X program is ready for its biggest challenge yet: flying the scramjet-powered X-43A at nearly 10 times the speed of sound.
The third and final X-43A hypersonic scramjet research vehicle took to the skies today on a tethered transport flight.
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