Pratt & Whitney JT12
| JT12 | |
|---|---|
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| A Cutaway JT12A Turbojet | |
| Type | Turbojet |
| National origin | United States |
| Manufacturer | Pratt & Whitney |
| First run | 1957 |
| Major applications | North American Sabreliner |
| Number built | 800+[1] |
| Variants | Pratt & Whitney T73 |
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.[2]
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[3]
- 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 Script error: No such module "convert". to Script error: No such module "convert"..
- JT12A-6
- Essentially similar to the -5
- JT12A-6A
- JT12A-7
- (J60-P-4) up-rated to Script error: No such module "convert".
- JT12A-8
- JT12A-8A
- JT12A-21
- An after-burning version developing Template:Cvt 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.
Applications
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
- Republic SD-4 Swallow
- Fairchild SD-5 Osprey
- Sikorsky S-69
- Sikorsky XV-2
Specifications (JT12A-8A)
Data from Aircraft engines of the World 1966/67[4]
General characteristics
- Type: Commercial turbojet
- Length: Template:Cvt
- Diameter: Template:Cvt
- Dry weight: Template:Cvt
Components
- Compressor: 9-stage axial compressor
- Combustors: Cannular - 8 burner cans in an annular casing
- Turbine: 2-stage axial turbine
- Fuel type: ASTM-A-1 / MIL-J-5624 / JP-1 / JP-4 / JP-5
- Oil system: Return pressure spray system at Template:Cvt
Performance
- Maximum thrust: Template:Cvt
- Overall pressure ratio: 6.7:1
- Air mass flow: Script error: No such module "convert". per second
- Turbine inlet temperature: Template:Cvt
- Specific fuel consumption: Template:Cvt per hour
- Thrust-to-weight ratio: 7.05
See also
Related development
Comparable engines
- Fairchild J83
- General Electric J85
- Ishikawajima-Harima J3
- Rolls-Royce RB.108
- Rolls-Royce RB.145
- Rolls-Royce RB.162
- Rolls-Royce Soar
- Armstrong Siddeley Viper
Related lists
References
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- ↑ Connors, p.285
- ↑ Greg Goebel's VectorsiteTemplate:Category handler[<span title="Script error: No such module "string".">usurped]Script error: No such module "Check for unknown parameters".
- ↑ Janes: JT12
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".
- Script error: No such module "citation/CS1".
External links
Template:Pratt & Whitney aeroengines Template:Pratt & Whitney Canada aeroengines Template:USAF gas turbine engines
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