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).
Data from Janes
YJ60-P-1—prototype
J60-P-3
J60-P-4
J60-P-5
J60-P-6
T73
Military designation of the Pratt & Whitney JFTD12 free power turbine turboshaft version of the J60.
JT12A-3LH
JT12A-5
(J60-P-3/-5/-6) Take-off ratings from 2,900 lbf (12.9 kN) to 3,001 lbf (13.35 kN).
JT12A-6
Essentially similar to the -5
JT12A-7
(J60-P-4) up-rated to 3,300 lbf (15 kN)
JT12A-8
JT12A-21
An after-burning version developing 4,024 lbf (17.9 kN) 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.
Lockheed JetStar
North American Sabreliner
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
Type: Turbojet
Length: 1930 mm (75.98 in)
Diameter: 556 mm (21.89 in)
Dry weight: 212 kg (467.38 lb)
Compressor: 9 stage axial compressor
Turbine: 2 stages
Maximum thrust: 14.6 kN (3,282.21 lbf)
Turbine inlet temperature: 872 °C (1,601.6 °F)
Power-to-weight ratio:
