In February 2021, the U.S. Air Force’s (USAF) Chief of Staff, General Charles “CQ” Brown, revealed that the USAF will study the idea of developing a clean-sheet fourth-generation fighter to replace its F-16s.[1] Brown added that the Air Force will also consider new-build F-16s (e.g., the Block-70/72) to replace old versions.[2]
The main driver for the study is a revised look at an optimal fleet composition. The Air Force is seeking to build the “right force mix” comprising of “high-end” and “low-end” fighters.
The “high-end” will comprise of fifth-generation fighters, such as the F-22 and F-35, and the upcoming Next-Generation Air Dominance (NGAD) platform.[3] The “low-end” is still an open question. The Air Force is interested in the value of an F-16-type aircraft, but not necessarily the F-16 itself.[4]
Thus, the study could potentially open the discussion to ‘next-generation’ fighters that do not emphasize low observability (LO) on radar as much as the F-22 or F-35. Interestingly, the U.S. is not the only country studying or working towards this concept. South Korea will soon fly its KF-21 Boramae and India is looking at developing its own carrier-capable jet, the Twin-Engine Deck-Based Fighter (TEDBF).
One could say that these fighters are not much different from existing 4.5-generation aircraft, such as the Rafale, Typhoon, or Gripen E/F. However, in contrast to older 4.5-generation fighters, these new platforms were designed to incorporate new technologies, such as active electronically-scanned array (AESA) radars and others, from the onset. In that sense, a ‘new’ 4.5-generation fighter is starting from a different league compared to its older counterparts. In fact, even the development process for these jets may be different.
One area of interest to the USAF is the use of digital engineering in the design process. They had employed digital engineering to design, develop, and fly the NGAD within a relatively short period of time. Likewise, the T-7 Red Hawk trainer had undergone a similar design and development process.
It is possible that this new clean-sheet 4.5-generation fighter could emerge in the same manner. However, with a digital engineering approach, the U.S. could test and validate aspects of the fighter (e.g., new types of subsystems and technologies) before rolling out a prototype.
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