Defense Advanced Research Projects Agency (DARPA) Creating Engines to Reach Past Mach 4
Engine Program Aims to Meet Military’s Need for Speed By Donna Miles American Forces Press Service WASHINGTON, Aug. 26, 2009 – The F-22 Raptor and F-18 Hornet fighter jets are fast, screaming through the air at twice the speed of sound, but the SR-71 Blackbird was faster, flying Mach 3 until mechanical problems and exorbitant operating costs forced [...]