Pratt & Whitney JT12

The J60 conception and project design began in July 1957 at United Aircraft of Canada (now Pratt & Whitney Canada) in Montreal. The project design details were transferred to the main P&W company in East Hartford and in May 1958, the first prototype, with military designation YJ60-P-1 commenced testing. Flight tests were completed in early 1959; followed by the delivery of the new JT12A-5 engines in July 1959. These were for the two Canadair CL-41 prototype trainers with a rating of 12.9 kN (2,900 lb st). The modified JT12A-3 turbojets with a basic rating of 14.69 kN (3,300 lb st) were tested in the two Lockheed XV-4A Hummingbird VTOL research aircraft. The next version, JT12A-21, had an afterburner which delivered a maximum thrust of 17.91 kN (4,025 lb st). ==Variants==

:Data from Janes ;YJ60-P-1:prototype ;J60-P-3: ;J60-P-3A: ;J60-P-4: ;J60-P-5: ;J60-P-6: ;J60-P-9: ;T73 :Military designation of the Pratt & Whitney JFTD12 free power turbine turboshaft version of the J60. ;JT12A-3LH: ;JT12A-5:(J60-P-3 / -3A / -5 / -6 / -9) Take-off ratings from to . ;JT12A-6:Essentially similar to the -5 ;JT12A-6A: ;JT12A-7:(J60-P-4) up-rated to ;JT12A-8: ;JT12A-8A: ;JT12A-21:An after-burning version developing thrust wet. ;FT12: :Turboshaft versions for marine use. ;JFTD12 :Company designation of the Pratt & Whitney T73 free power turbine turbo-shaft version of the J60. Civilian (JT12) • Lockheed JetStar • North American Sabreliner • Aérotrain Experimental 02 (French Touch in 60') • Dassault Mystère 20 (Falcon 20) prototype Military (J60) • Lockheed XH-51 • Lockheed XV-4 Hummingbird • Martin/General Dynamics RB-57F Canberra • North American T-2B Buckeye • North American T-39 Sabreliner • Republic SD-4 Swallow • Fairchild SD-5 Osprey • Sikorsky S-69 • Sikorsky XV-2 ==Specifications (JT12A-8A)==