HTV-2实现Ma=20可控飞行美国FALCON高超声速技术飞行器HTV-2在2011年8月11日的试飞中保持了若干分钟的Ma=20高超声速飞行,随后出现状态异常,任务提前中止。第二次试飞开始于8月11日,从范登堡空军基地发射的牛头怪4运载火箭搭载着HTV-2飞行器起飞升空。运载火箭成功将HTV-2运送至预定轨 HTV-2 Achieves Ma = 20 Controllable Flight The FALCON hypersonic vehicle HTV-2 maintained a Ma = 20 hypersound flight for a few minutes during the test flight on August 11, 2011, and subsequently the state was abnormal. The mission was stopped ahead of schedule. The second test flight began on August 11 with the Tropicana 4 launch vehicle carrying a HTV-2 aircraft off the Vandenberg Air Force Base. The launch vehicle successfully transported the HTV-2 to a scheduled orbit