The fourth and final mission of the Boeing X-51A WaveRider unmanned hypersonic vehicle sets the record for the longest ever air-breathing hypersonic flight. The X-51A traveled more than 230 nautical miles in slightly more than six minutes off the coast of southern California. A B-52 starting from Edwards AFB, Calif., carried the WaveRider aloft, releasing it at approximately 50,000 feet in altitude. The X-51’s rocket booster accelerated the vehicle to Mach 4.8, when the X-51 separated and ignited its supersonic combustion ramjet engine to propel itself to Mach 5.1 at 60,000 feet.
The program executive officers for some of the Air Force’s largest acquisition management organizations are struggling to deal with an exodus of senior talent and experienced civilian staff, three of them told an industry conference.
