General Electric YF120
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The General Electric YF120, internally designated as GE37, was a variable cycle afterburning turbofan engine designed by General Electric Aircraft Engines in the late 1980s and early 1990s for the Uni
YF120 at the National Museum of the U.S. Air Force
The second YF-23 (left), nicknamed “Spider”, was powered by two YF120 engines.
The first YF-22 (right), registration number N22YF, was powered by two YF120 engines.
The YF120 on the YF-22, registration number N22YF, was equipped with thrust vectoring nozzles.
Northrop YF-23
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The Northrop–McDonnell Douglas YF-23 is an American single-seat, twin-engine, stealth fighter prototype technology demonstrator designed for the United States Air Force. The design team, with Northrop
YF-23 flying over Edwards Air Force Base
Diagram of several designs submitted for ATF RFI, showing the comparatively small sizes of Northrop's initial designs
From left to right, flat-plate models of Northrop's AMF, USF ("Christmas Tree"), and HSF design concepts. HSF was the preferred concept by 1985.
Northrop's DP110 submission for Dem/Val RFP, which was similar to the eventual YF-23