Pratt & Whitney JT3C

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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.

Contents 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)

[edit] Uses

Military (J57)

• Boeing B-52 Stratofortress
• Boeing C-135 Stratolifter and KC-135 Stratotanker
• Convair F-102 Delta Dagger
• Convair XB-60
• Douglas A3D Skywarrior
• Douglas F4D Skyray
• Lockheed U-2
• Martin B-57 Canberra
• McDonnell F-101 Voodoo
• North American F-100 Super Sabre
• Northrop XSM-62 Snark
• Vought F8U Crusader

Civilian (JT3C)

• Boeing 707
• Boeing 720
• Douglas DC-8

[edit] References

• USAF Museum
• Pratt & Whitney

[edit] Notes

1. ^ List of Collier Trophy Winners

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