AnonymouShadow on Instagram: "(Video): “North American X-15” The North American X-15 Extending its Nose Wheel and Two Rear Skids The X-15 was a rocket-powered research aircraft used by NASA, the U.S. Air Force, and the U.S. Navy to study hypersonic and suborbital flight. Its primary purpose was to provide data on high speed, high altitude flight to support future aerospace programs like the Mercury, Gemini, Apollo, and Space Shuttle, which it did by achieving new speed and altitude records Engin