Add Yahoo as a preferred source to see more of our stories on Google. Army Futures Command Chief of Staff Maj. Gen. Michael C. McCurry, left, and Vice Chairman of the Joint Chiefs of Staff Adm.

-NASA’s X-43A was a black, wedge-shaped test vehicle that did something once thought impossible: it proved an air-breathing scramjet could fly at hypersonic speeds, reaching Mach 7 and then Mach 9.6 ...

Rotating Detonation Engines (RDE) have been flown by Venus Aerospace. They use continuous detonation waves for propulsion and provide 15% efficiency gains (in specific impulse or fuel consumption) ...