. "* DARPA Falcon Project\n* HyShot\n* Rockwell X-30\n* Project Rheinberry"@en . . "NASA X-43"@en . . . . . . "* Boeing X-51\n*Hypersonic Technology Demonstrator Vehicle"@en . "The X-43 was an unmanned experimental hypersonic aircraft with multiple planned scale variations meant to test various aspects of hypersonic flight. It was part of the X-plane series and specifically of NASA's Hyper-X program. It set several airspeed records for jet-propelled aircraft. The X-43 is the fastest aircraft on record at approximately Mach (mph) (11,000 km/h). A winged booster rocket with the X-43 placed on top, called a \"stack\", was drop launched from a larger carrier plane. After the booster rocket (a modified first stage of the Pegasus rocket) brought the stack to the target speed and altitude, it was discarded, and the X-43 flew free using its own engine, a scramjet. The first plane in the series, the X-43A, was a single-use vehicle. Three of them were built. The first was destroyed after malfunctioning in flight; the other two have successfully flown, with the scramjet operating for approximately 10 seconds, followed by a 10-minute glide and intentional crash into the ocean. __TOC__"@en . . . . . . . . . . . "The X-43 was an unmanned experimental hypersonic aircraft with multiple planned scale variations meant to test various aspects of hypersonic flight. It was part of the X-plane series and specifically of NASA's Hyper-X program. It set several airspeed records for jet-propelled aircraft. The X-43 is the fastest aircraft on record at approximately Mach (mph) (11,000 km/h). __TOC__"@en . .