Pratt & Whitney T73
Turboshaft engine
From Wikipedia, the free encyclopedia
The Pratt & Whitney T73 (company designation JFTD12) is a turboshaft engine.[2] Based on the JT12A, the T73 powered the Sikorsky CH-54 Tarhe and its civil counterpart Sikorsky S-64 Skycrane flying crane heavy-lift helicopters.[3] Turboshaft versions for naval use are known as the FT12, and have been used on the Iroquois-class destroyer.
| T73/JFTD12 | |
|---|---|
| JFTD12-4A mounted on an Erickson S-64E Aircrane | |
| Type | Turboshaft |
| National origin | United States |
| Manufacturer | Pratt & Whitney |
| Major applications | |
| Number built | 352[1] |
| Developed from | Pratt & Whitney JT12 |
Variants
- T73-P-1
- Basic military model, rated at 4,500 horsepower (3,355 kW) takeoff power and 4,000 horsepower (2,982 kW) maximum continuous power[4]
- T73-P-700
- Higher-power military model with improved internal components; rated at 4,800 horsepower (3,579 kW) takeoff power and 4,430 horsepower (3,303 kW) maximum continuous power[4]
- JFTD12A-3
- JFTD12A-4A
- Civilian equivalent of T73-P-1[4]
- JFTD12A-5A
- Civilian equivalent of T73-P-700[4]
- FT12
- Marine powerplant
Applications
- Sikorsky CH-54 Tarhe (T73)
- Sikorsky S-64 Skycrane/Erickson Air-Crane S-64 Skycrane (JTFD12)
- Iroquois-class destroyer (FT12AH-3)
Specifications (T73-P-1)
Data from FAA Type Certificate E15EA
General characteristics
- Type: Turboshaft
- Length: 107.0 in (2,718 mm)
- Diameter: 30.0 in (762 mm) maximum
- Dry weight: 966 lbs (438 kg)
Components
- Compressor: nine stage axial compressor
- Combustors: eight cans in annular configuration
- Turbine: axial two stage gas generator turbine and axial two stage free turbine
- Fuel type: aviation kerosene conforming to MIL-I-5161 E Grade I or II
Performance
- Maximum power output: 4,500 horsepower (3,355 kW) takeoff, 4,000 horsepower (2,982 kW) maximum continuous; at sea level at or below -8°C (17°F)
- Turbine inlet temperature: 688°C (1270°F)
- Power-to-weight ratio: 4.66 hp/lb (7.66 kW/kg)
See also
Related development
Comparable engines
Related lists
