Pratt & Whitney JT12

The Pratt & Whitney JT12, known to the United States military as the J60, is a small turbojet engine. Its design began in July 1957 at United Aircraft of Canada, now Pratt & Whitney Canada, in Montreal, and the details then moved to the main company at East Hartford, where the first prototype, the YJ60-P-1, began testing in May 1958. Flight tests were completed in early 1959, and JT12A-5 engines rated at 12.9 kilonewtons were delivered that July for two Canadair CL-41 prototype trainers. The JT12A-3 flew in the two Lockheed XV-4A Hummingbird research aircraft, and the JT12A-21 added an afterburner for about 17.9 kilonewtons of thrust. Civilian JT12s powered the Lockheed JetStar and the North American Sabreliner, while military J60s powered aircraft such as the North American T-2B Buckeye and the RB-57F Canberra. A related free-power-turbine turboshaft version was sold as the JFTD12 and designated T73.