A second attempt at a boost/glide flight to demonstrate sustained hypersonic cruise in the atmosphere has been scheduled for Aug. 10-17 after changes following the loss of the first test vehicle in April 2010 just 9 min. into its flight across the Pacific. The Defense Advanced Research Projects Agency’s (Darpa) first HTV-2 was lost because an adverse roll-yaw coupling on re-entry at Mach 20 exceeded the autopilot’s authority and led to the autonomous flight termination system destroying ...


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