Did China Really Fly a Sixth-Generation Fighter Last Month?

The portion of the news media attentive to defense affairs and aviation technology has since late December buzzed with talk about the public flight of what is apparently a prototype of a new Chinese combat aircraft. Identified as the Chengdu J-36 by Western observers, many rushed to speak of it as a sixth-generation fighter.

But is it really a sixth-generation fighter? Given the differing, and changing, understanding of the term, what would that even mean, anyway? Back circa 2010 when talk of sixth-generation fighters was really getting going in a public way there were particular expectations for those planes, identifying the sixth generation of jet fighter with optionally manned hypersonic fighter jets capable of changing shape in flight and armed with directed-energy weapons--expectations which have proven profoundly unrealistic given the far slower pace of the development of the relevant technologies, such that more recent discussion has had much more modest expectations with regard to the technological difference between them and their fifth-generation predecessors. Indeed, it seemed to me that by "sixth-generation" what the analysts meant were more usefully describable as "fifth-generation-plus," fifth-generation jets with some modifications enhancing their abilities beyond the baseline for that generation but falling short of a true shift to some subsequent generation. (For example, it seemed we might end up with fifth-generation jets that were not "optionally manned," but provided "AI" copilots that meaningfully relieved the pilot's workload.)

Considering what we know of the J-36 do we have something that can be considered even "fifth-generation-plus?" Let us go with what seems most clearly established about the plane, namely its shape--that it is, as Rick Joe explains over at The Diplomat, a "double delta tailless flying wing planform, with a rather voluminous and blended fuselage," a 20 meter wingspan, and a length that may be up to 26 meters, with its dimensions suggesting a weight that may exceed 50 tons.

None of those traits are obviously "next-generation," or even obviously fifth-generation-plus, and nor are the smaller, more argued-over features. The plane has a visible cockpit, perhaps designed to accommodate two crew seated side by side, so while one cannot rule out its being highly automated, one cannot claim that it is so on the basis of what we can see. The plane has "low observable" features, like the aforementioned flying wing shape, the internal storage of weapons (until recently, also associated with strike aircraft rather than fighters), and the design of the intakes and the exhaust system--but again these do not warrant characterization as "next-generational." The result is that claims for this plane as "sixth-generation" smack of hype. Indeed, it is not clear the plane is even a fighter at all. The flying wing design, the dimensions and weight, the use of three engines rather than two to power the whole because of that weight, even the possible tandem seating in the cockpit; the apparent optimization of the plane for "range, internal volume, and high-altitude as well as high-speed performance" as Joe has it, with subsonic agility a relatively low priority; and the fact that at this moment we have no evidence whatsoever of its actually being equipped for air-to-air combat; has me wondering whether the plane is a "fighter" plane at all, rather than a strike aircraft, a mistake people have made before in regard to radical new aircraft designs. (Those who remember the F-117 Nighthawk will recall how people initially thought that "stealth fighter" was a fighter when in fact it was a strike aircraft, and a "fighter" only in the sense that the plane was designed for tactical rather than strategic use. Those who remember the F-111 Aardvark will remember, too, how that plane was originally intended to be a fighter, but partly because of its sheer size and weight ended up filling a strike role instead.)

Altogether we may simply be looking at an advanced but essentially current-generation strike aircraft--a view some have already taken, as Joe acknowledges in his article. However, he also suggests that if the plane looks strike aircraft-ish, it may be that in an age of increasingly beyond visual range and system-of-systems-based combat strike aircraft-ish designs optimized for persistence and capacity may make more sense than nimble dogfighters in the air superiority/dominance. He even goes so far as to speak of the term "fighter" as becoming anachronistic in this new age of air-to-air combat. I do not wholly rule out that possibility--but considering it remember that past generations of defense planners thought such a moment was at hand too, as we saw when in the 1950s we started getting fighter jet designs which eschewed maneuvering and gunnery in favor of long-range sensors and missiles, like the F-4 Phantom--and the decision quickly discovered to have been a mistake, the technology for all that proving to "just not be there yet," so that they incorporated guns into later models of the aircraft, pilots learned to dogfight again, and the next generation designs placed a high stress on maneuverability (as we saw with the fourth-generation F-15 and F-16, the fifth-generation F-22). If that is not the case, however, and Joe is right about what air combat will mean, then we still have grounds to not speak of this plane as a sixth-generation fighter--because rather than a new generation of the Meteors and P-80s and Me-262 we saw at the end of World War II what we are getting is the first generation of something else.