Version: 2008

November 16, 2004 3:22 PM PST

Rocket plane breaks airspeed record

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After a day's delay, the National Aeronautics and Space Administration launched an experimental rocket-powered airplane that smashed the previous airspeed record, reaching close to 7,000 miles per hour.

The test of the X-43A "scramjet" was the third and most ambitious test of a series. The second test reached 5,000 miles per hour, while the first was aborted after problems with a rocket booster. Tuesday's flight reached Mach 10, or about 10 times the speed of sound.

NASA researchers declared the test, which was aimed both at testing the capacity of the supersonic engine and the performance of the vehicle at the extremely high speeds, a success.

The engine differs substantially from an ordinary jet engine, which typically uses internal rotors to help compress air. The scramjet works more like a simple duct, taking in air through a large opening and funneling it through a much narrower passage.

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