Williams_F112 Knowpia

F112
	An F112 engine on display at the National Museum of the United States Air Force
Type	Turbofan
National origin	United States
Manufacturer	Williams International
First run	1970s
Major applications	AGM-129 ACM
Developed from	Williams F107

The Williams F112 is a small turbofan engine made by Williams International designed to power cruise missiles. It has been used as the powerplant for the AGM-129 Advanced Cruise Missile and the AGM-86B advanced cruise missile, as well as the experimental X-36 and X-50.

Design and development edit

Although Williams originally designed these small turbofans to power target drones while aiming for a contract in the Subsonic Cruise Armed Decoy (SCAD) program, it quickly became apparent that these were valuable tools to be used in the future to power advanced cruise missiles. Originally designated the F107-WR-14A6, then designated the F107-WR-103 by Williams then designated the F112-WR-100 by the USAF.

Though the true benefits that the F112 brought to the AGM-129 are classified, it has been said that the F112 increased the range of the AGM-129 to four times that of the AGM-86B. Another benefit is that the infrared heat signature has also been reduced or nearly eliminated, aiding the stealthiness of the AGM-129. This was accomplished with the use of high tech materials and coatings.

Applications edit

Specifications edit

General characteristics

Type: Twin-spool counter rotating turbofan
Length: 29.5 in
Diameter: 12 in (at widest point)
Dry weight: 161 lb (99 lb without accessories)

Components

Compressor: Two-spool, counter-rotating
Combustors: annular
Turbine: axial
Fuel type: heavy fuel Boron-Slurry (aka JP-10)
Oil system: self contained 1.3 pints (0.61 liters)

Performance

Maximum thrust: 732Ib (332kg)
Overall pressure ratio: 30:1
Bypass ratio: 1:1
Turbine inlet temperature: TIT 2000 deg F (1093 deg C) without turbine blade cooling; 1750 deg F (954 deg C) with turbine blade cooling
Specific fuel consumption: approx 0.25 lb/(lbf h) (but some calculations bring this number to 0.15 lb/(lbf h)
Thrust-to-weight ratio: 4.73

References edit

Leyes II, Richard A.; William A. Fleming (1999). The History of North American Small Gas Turbine Aircraft Engines. Washington, DC: Smithsonian Institution. ISBN 1-56347-332-1.