Hypersonic speed is five times the speed of sound. Scientists measure speeds this fast with a Mach number, named for Austrian physicist Ernst Mach. Sound has a speed of Mach 1 and anything Mach 5 or above is considered hypersonic. While the speed of sound changes depending on temperature and...
Hypersonic is, obviously, supersonic on steroids. But while "supersonic" has the clear cut definition of being faster than the speed of sound (Mach 1), hypersonic is a little fuzzier. Generally, hypersonic speeds are the point at which the molecules of air that surround the aircraft start ...
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The FTI used in hypersonic flight testing has to be more robust than that used in conventional testing. 20 years ago, early hypersonic test vehicles would be made from material that would ablate away. “A vehicle would fly at a relatively low altitude at a very high speed, so the...
Just as water squeezed through a narrow pipe accelerates dramatically into a fast jet (think of what happens in a water pistol), the tapering design of the exhaust nozzle helps to accelerate the gases to a speed of over 2100 km/h (1300 mph). So the hot air leaving the engine at the ...
As she climbs, she experiences an odd feeling of time slowing down—she’s still moving fast, but she has a sensation of having been in the car for a very long time. Everything that might jab at her mind—the devastation of Ken’s passing and Lia’s own looming drive and where they...
The hypersonic, winged first stage would carry the shuttle orbiter on its back, up to an altitude of at least 50,000 feet (15,240 meters). The first stage would then fly back to Earth and land like an airplane, while the orbiter cruised into space. Budget issues kept this from ...
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All this talk of air-tearing speed and space-brushing altitude might leave you wondering how high or how fast we've already gone. As of November 2012, the X-15 rocket plane holds the world's unofficial speed record, 4,520 mph (7,274 kph, a hypersonic Mach 6.7), and unofficial altitud...