The X-43A Hypersonic Experimental Vehicle, or "Hyper-X" undergoing ground testing at NASA's Dryden Flight Research Center, Edwards, CA, in December 1999.
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The X-43A Hypersonic Experimental Vehicle, or “Hyper-X” undergoing ground testing at NASA’s Dryden Flight Research Center, Edwards, CA, in December 1999. The X-43A was developed to research a dual-mode ramjet/scramjet propulsion system at speeds from Mach 7 up to Mach 10 (7 to 10 times the speed of sound, which varies with temperature and altitude).December 1999NASA Photo / Tom Tschida› X-43A Project Description