09/09/2026
ON THIS DAY IN U.S. AIR FORCE HISTORY: 1958 - A Lockheed X-7 ramjet, air-launched from a B-50 bomber, exceeded Mach 4 to become the fastest air-breathing missile.
The X-7 (dubbed the "Flying Stove Pipe") was an American unmanned test bed of the 1950s for ramjet engines and missile guidance technology. It was the basis for the later Lockheed AQM-60 Kingfisher, a system used to test American air defenses against nuclear missile attack. A total of 130 X-7 flights were conducted from April 1951 to July 1960.