Second HTV-2 Achieved Longer Stable Mach 20 Flight
The HTV-2 hypersonic glider achieved stable, controlled flight at Mach 20 for more than 3 min. before an unknown anomaly ended its Aug. 11 second flight prematurely, says the U.S. Defense Advanced Research Projects Agency (Darpa). Although the first and second flights of the dart-shaped, rocket...
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