ブログネタ:軍事 に参加中! X-51A conducts flight test(2010/5/26 The Official Website of Edwards Air Force Base) EDWARDS AIR FORCE BASE, Calif. -- An X-51A Waverider flight test vehicle successfully made the longest ever supersonic combustion ramjet-powered hypersonic flight today off the Southern California coast. The more than 200-second burn by the X-51's Pratt & Whitney Rocketdyne-built air breathing scram