Pratt & Whitney JT3C

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YJ57-P-3 cut-away demonstrator at USAF Museum

The Pratt & Whitney JT3C (USAF designation: J57) was a development of the T45 turboprop engine intended for the XB-52. As the B-52 power requirements grew, the design evolved into a turbojet. The JT3C was the first 10,000 lbf (45 kN) thrust class engine in the United States.

The prestigious Collier Trophy for 1952 was awarded to Leonard S. Hobbs, Chief Engineer of United Aircraft Corp., for "designing and producing the P&W J57 turbojet engine".^[1]

On May 25, 1953, a J57-powered YF-100A exceeded Mach 1 on its maiden flight. The engine was produced from 1951 to 1965 with a total of 21,170 built. The JT3C was developed into Pratt & Whitney JT3D turbofan.

1 Specifications (J57-P-23)
2 Specifications (J57-P-43WB)
3 Uses
4 References
- 4.1 Notes

[edit] Specifications (J57-P-23)

General characteristics

Type: Afterburning turbojet
Length: 244 in (6,200 mm)
Diameter: 39 in (1,000 mm)
Dry weight: 5,175 lb (2,347 kg)

Components

Compressor: Two-spool 16-stage axial compressor

Performance

Thrust:
- 11,700 lbf (52.0 kN) dry
- 17,200 lbf (76.5 kN) with afterburner
Overall pressure ratio: 11.5:1
Turbine inlet temperature: 1,600 °F (870 °C)
Specific fuel consumption: 2.10 lb/(h·lbf) (214.2 kg/(h·kN)) with afterburner
Thrust-to-weight ratio: 3.32:1 (32.6 N/kg)

[edit] Specifications (J57-P-43WB)

General characteristics

Type: Turbojet with water-methanol injection for thrust augmentation
Length: 169 in (4,300 mm)
Diameter: 35 in (900 mm)
Dry weight: 3,875 lb (1,757 kg)

Components

Compressor: Two-spool 16-stage axial compressor

Performance

Thrust: 11,220 lbf (49.9 kN) with water-methanol injection
Overall pressure ratio: 12.0:1
Turbine inlet temperature: 1,600 °F (870 °C)
Specific fuel consumption: 0.755 lb/(h·lbf) (77.0 kg/(h·kN)) at maximum military power
Thrust-to-weight ratio: 2.9:1 (28.4 N/kg)