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144 Military Jet Engine Acquisition fan, which provided some lift and prevented the engine exhaust from recirculating into the engine inlet. Minority partner Rolls-Royce developed the lift nozzles and jet screen hardware. Small pitch, roll- and-yaw nozzles were integrated near the engine’s main nozzle to provide stability control during STOVL operations. The engine was also stretched several feet by inserting an extra duct (essentially a large tube) upstream of the afterburner in order to move the main engine forward, enabling placement of the vertical lift nozzles in the appropriate location with respect to the aircraft center of gravity. Lockheed-Martin’s X-35 (the winner of the competition) used a low- observable axi-symmetric nozzle. Its STOVL variant used a shaft driven vertical-lift fan just behind the cockpit, roll control ducts in the wings, and a large three-bearing swivel duct to rotate the main nozzle to point vertically downward during STOVL operation. The lift fan’s shaft was driven by the F119’s low-pressure spool and con- nected by a clutch and gearbox. Minority partner Rolls-Royce devel- oped the three-bearing swivel duct and roll control duct. Similarly, Allison, a division of Rolls-Royce, developed the lift fan hardware (Kandebo, 1998d, and Warwick, 1997). F120 The Air Force and GE have continued to mature and enhance the F120 through the IHPTET program since the Advanced Tactical Fighter program source selection in 1991. This has reduced the risk and uncertainty of this variable-cycle afterburning turbofan. Due to the large number of JSFs to be built and the desire to use competition to keep prices low and performance and reliability high, the JSF pro- gram has selected the F120 to be the “alternate engine” for the JSF. If this program follows the precedent set by the F-16, the Air Force will have JSFs fielded with both derivatives of F119 and F120 engines starting after 2010. The JSF version of this engine will be developed and built by a team led by GE, with Rolls-Royce participating. The F120’s variable-cycle capability allows the engine to change its bypass ratio as appropriate over the aircraft’s flight envelope. This functionality requires additional control logic and flow control hardware. Other advanced technologies in the F120 include combus- tor and high-pressure turbine blades and vanes made of Rolls- Royce’s (Allison’s) “Lamilloy.” Lamilloy is essentially a material madePDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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