Scramjet Milestones (Part 1) In November of 1991, Russian scientists with the support of French colleagues, tested a small axisymmetric hydrogen ramjet propelled by a SA-5 surface to air missile, at Mach 5.35. In 1993 the Australian University of Queensland achieved the first positive net thrust in an completely scramjet powered vehicle tested in their T4 shock tunnel.             http://www.mech.uq.edu.au/hyper/level2/hyper_photographs.html On June 2, 2001 NASA launched the first X-43a prototype scramjet mounted to the front of a modified Pegasus rocket fired from a B52 aircraft, but before the scramjet even came to operational velocities, the rocket combo spiraled out of control. August 30, 2001 the US  Defense  Advanced Research Projects Agency fired a 4 inch diameter 20% scramjet powered missile at Mach 7 from a specialized gun.  The scramjet then covered  260 ft in about 30 milliseconds under its own power.           http://www.news.navy.mil/search/display.asp?story_id=2072&page=2