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Image 3 General Electric LO Axi Nozzle (left) and Pratt & Whitney LOAN (right) ground and flight testing on the F-16. These F-16 LO nozzle configurations included an ejector feature to address thermal degradation of nozzle divergent section seals and flaps. That remains a top driver of maintenance on modern jet engines. The ejector provided effective film cooling to reduce nozzle temperatures and improve component life using engine nacelle bay bypass air. These techniques were expected to double or quadruple nozzle divergent flap life, resulting in significant maintenance cost savings. 5. Radio Frequency Testing For the F-35, the ability to see before being seen provided a fulcrum upon which to balance sensor/radar capability and LO technologies; strengths in one area provided flexibility in the other. The strength of emerging technologies in the radar and sensor suites opened up options for using the LO nozzle. This was comparable to the manner in which the development of high off-boresight missiles reduced the appetite for thrust vectoring and nose pointing. Radar testing was employed for the JSF program to evaluate the unique shape and special coatings evident in the Pratt & Whitney LOAN. The configuration achieved stealth through a combination of technologies, including geometric shaping, advanced cooling, and special coatings on internal and external surfaces. One major radio frequency model (Image 4) developed under IRAD was suitable for integrating inlets, nozzles, apertures, edges, and other subsystems. It was designed for installation on the 30,000-pound rotator at the Meridian Antenna Test Range in Meridian, Texas. Image 4 Radio frequency test fixture with the F-35 LO nozzle at the Pratt & Whitney facility in West Palm Beach. 6. Transition to the JSF Program For the F-35, the Pratt & Whitney F135 engine and LOAN balanced the requirements of LO and efficient aeromechanical performance. It offered a lightweight (especially for the F-35B STOVL variant), low-cost configuration. The F-35A and F-35C variants use the same nozzle configuration. A shorter version was readily configured for compatibility with the F-35B STOVL 3BSM to meet ground clearance needs while landing vertically. Since the engine exhaust system is the primary contributor to aft sector infrared signature, engine and nozzle design Approved for public release 5/8/18, JSF18-365 21PDF Image | F-35 Air Vehicle Technology Overview
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