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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).
The YF-22 and YF-23 in formation during flight testing in the early 1990s The squadron was first activated as the 6511th Test Squadron in March 1989 to conduct the Advanced Tactical Fighter program. It began flying the Northrop YF-23 on 27 August and the Lockheed YF-22 on 29 September 1990, flying both through December 1990, though the ...
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.
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 ...
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The YF120 had different nozzle designs for the YF-22 and YF-23 technology demonstrator prototypes tailored to the specific airframe. The YF120 on the YF-22, registration number N22YF, was equipped with thrust vectoring nozzles. The engine for the YF-22 featured a two-dimensional thrust vectoring nozzle that could vector in the pitch direction ...
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.
The Advanced Tactical Fighter (ATF) was a program undertaken by the United States Air Force to develop a next-generation air superiority fighter to replace the F-15 Eagle in order to counter emerging worldwide threats in the 1980s, including Soviet Sukhoi Su-27 and Mikoyan MiG-29 fighters under development, Beriev A-50 airborne warning and control systems (AWACS), and increasingly ...