The Lockheed YF-12 changed into a prototype plane advanced by using the Lockheed enterprise inside the late Fifties and early Sixties. The massive two-individual aircraft changed into built to intercept enemy plane at Mach three speeds.
trying out of the YF-12 become completed over region fifty one, the U.S. Air pressure's pinnacle-mystery test and schooling range, placed in a faraway part of southern Nevada. the various YF-12 flights had been used to hide the identification of the Lockheed A-12 reconnaissance aircraft, which turned into being tested on the equal time for the CIA.
The YF-12 made its first flight in 1963, and had a said pinnacle speed of Mach 3.2 (2,070 mph, or three,330 km/h) at an altitude of 80,000 feet (24,four hundred m). The U.S. Air force subsequently cancelled the program, but the YF-12 made a number of research flights for the Air force and NASA till 1978.