Scramjet: It's an evocative name for the
jet engine powering the
NASA X-43A hypersonic research aircraft, which is designed to fly at speeds up to Mach 10.
"Mach Number" was 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 less 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 at sea level.
In a test Saturday, the scramjet powered X-43A successfully flew at Mach 7, setting a new air speed record. The hydrogen-fueled aircraft has a wingspan of approximately 5 feet, measures 12 feet long and weighs about 2,800 pounds.
This NASA multi-year experimental hypersonic ground and flight test program, called Hyper-X is a high-risk, high pay-off research effort that will demonstrate "air-breathing" engine technologies that promise to increase payload capacity -- or reduce vehicle size for the same payload -- for future hypersonic aircraft and/or reusable space launch vehicles.
The name scramjet is acronymic for "supersonic combustion ramjet" and, actually, doesn't mean, "Get outa here, Jet."
Posted by
abnu on Sunday, March 28, 2004 @ 7:37 AM
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