Pratt & Whitney JT12

The Pratt & Whitney JT12, (US military designation J60) is a small turbojet engine. The Pratt & Whitney T73 (Pratt & Whitney JFTD12) is a related turboshaft engine.

Design and development
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 12.9 kN to 13.35 kN.
 * JT12A-6:Essentially similar to the -5
 * JT12A-6A:
 * JT12A-7:(J60-P-4) up-rated to 3,300 lbf
 * JT12A-8:
 * JT12A-8A:
 * JT12A-21:An after-burning version developing 4023 lbf 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')

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
 * Sikorsky S-69