Williams F107

Turbofan engine for cruise missiles

The Williams F107 (company designation WR19) is a small turbofan engine made by Williams International. The F107 was designed to propel cruise missiles. It has been used as the powerplant for the AGM-86 ALCM, and BGM-109 Tomahawk, as well as the experimental Kaman KSA-100 SAVER and Williams X-Jet flying platform.

Applications

• AGM-86 ALCM
• BGM-109 Tomahawk
• AGM-158 JASSM
• Kaman KSA-100 SAVER
• Williams X-Jet
• Bell Aerospace Flying Jet Belt
• Dynetics Gremlins X-61

Specifications (WR19)

Data from Aircraft engines of the World 1970^[1]

General characteristics

• Type: Turbofan
• Length: 24 in (610 mm)
• Diameter: 12 in (300 mm)
• Dry weight: 67 lb (30 kg)

Components

• Compressor: 2-stage fan, 2-stage axial IP compressor, 1-stage centrifugal HP compressor
• Combustors: Annular combustion chamber
• Turbine: 1-stage HP turbine, 2-stage LP turbine
• Fuel type: JP-4 / JP-5
• Oil system: Pressure system with return

Performance

• Maximum thrust: 430 lbf (1.9 kN) Maximum continuous power
  

F107-WR-400 610 lbf (2.7 kN)

F107-WR-402 700 lbf (3.1 kN)

F107-WR-105/401 1,400 lbf (6.22 kN)

• Overall pressure ratio: 13.8:1
• Bypass ratio: 1:1
• Specific fuel consumption: 0.683 lb/lbf/h (69.6 kg/kN/h)
• Thrust-to-weight ratio: 6.42

F122

The Williams International F122 is a twin-shaft, axial-centrifugal-flow turbofan that is similar to the F107 in configuration but has a maximum thrust of 900 lbf (3.33 to 4.0 kN).

Design and development

The F122 is used to power the KEPD 350 air-launched cruise missile, and was the powerplant for the cancelled AGM-137 TSSAM air-launched cruise missile.^[2] Although the AGM-137 was cancelled, the F122 was first used for the Taurus KEPD when it was flown aboard that missile in April 2002.

Applications

• AGM-137 TSSAM^[3]
• KEPD 350

See also

• List of aircraft engines
• Teledyne CAE J402
• Microturbo TRI 60

References

1. Wilkinson, Paul H. (1970). Aircraft engines of the World 1970 (21st ed.). Washington D.C.: Paul H. Wilkinson. p. 120.
2. "Designations Of U.S. Military Aero Engines". www.designation-systems.net.
3. "Northrop AGM/MGM-137 TSSAM". www.designation-systems.net.

Further reading

• Leyes, Richard A.; Fleming, William A. (1999). The history of North American small gas turbine aircraft engines Chapter 10. Washington D.C.: AIAA /Smithsonian Institution. ISBN 1-56347-332-1.

The initial version of this article was based on a public domain article from Greg Goebel's Vectorsite.

External links

• National Museum of the USAF F107 fact sheet
• F107-WR-400_Turbofan_PCS_-_October_1984