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The Northrop/McDonnell Douglas YF-23 is an American single-seat, twin-engine, stealth fighter technology demonstrator prototype designed for the United States Air Force (USAF).
Prototypes and concept demonstrators built by American manufacturers included the Lockheed YF-22 – 1990 (2 built), Northrop YF-23 – 1990 (2 built) for the Advanced Tactical Fighter program, Boeing Bird of Prey – 1996 (1 built), McDonnell Douglas X-36 – 1997 (2 scale models built), the Lockheed Martin X-35 – 2000 (2 built) and Boeing X ...
YF-23 with YF119 engines taking off in afterburners, showing the exhaust trough in the aft deck. The YF119 on the YF-23 had a single-expansion ramp nozzle (SERN) consisting of a variable wedge flap on the top and a fixed ramp on the bottom, which then transitions to a trench on top of the aft fuselage.
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Engine Origin Designer Vehicle Status Use Propellant Power cycle Specific impulse (s) [a] Thrust (N) [a] Chamber pressure (bar) Mass (kg) Thrust: weight ratio [b] Oxidiser: fuel ratio
It is difficult enough finding detailed info on the YF-23. It took multiple references to cover the details in places. But I'm working on combining footnotes from sources I have and can check. There is no real conflict on the interim bomber use. The YF-23 was modified only for display use; believe only the cockpit was modified/updated..
Martin Model 139WAA – export version of B-10 bomber, painted in Air Corps livery [23] Nieuport 28 C.1 [24] North American NA-64 – painted as a North American BT-9 or BT-14 [25] North American O-47B 39-112 [26] Northrop A-17 36-207 [27] Packard-Le Pere LUSAC-11 [28] Sopwith Camel – reproduction [29] SPAD VII 94099 [30] SPAD XIII 16594 [31 ...
However, the cited books in this article are written by people with direct connections to the YF-23, namely Alfred "Paul" Metz, YF-23 PAV-1 test pilot, and Air Force Materiel Command researchers and archiver, Tony Landis and reputed aviation author Dennis Jenkins. If that is the case, I can upload a non-free thumbnail version under fair use.