Key Points and Summary – China’s J-20 “Mighty Dragon” is formidable but not untouchable. The plane has one mission: defeat the best the F-22 and F-35 fighters have to offer. Any yet, the J-20 has several flaws.
-Analysts debate its true stealth, noting canards and shaping that may light it up sooner than F-22/F-35.
-Top speed is solid yet unexceptional, and engine maturity remains a risk after AL-31F and WS-10C stopgaps while WS-15 ramps.
-Maneuverability likely trails U.S. fifth-gens, and PLAAF pilots lack combat seasoning. Another knock: no internal cannon if missiles run dry.
-Beijing’s answer is mass—fielding hundreds and leaning on long-range PL-15s to kill at BVR.
-Those flaws matter if ambushes fail and fights compress into visual range. Weather, geography, and tactics still matter.
5 Weaknesses of China’s J-20 Mighty Dragon
Just how good is the J-20 Mighty Dragon? This airplane is China’s pride and joy. Xi Jinping believes that deploying these multi-role interceptors with ground strike capabilities will convey a message to Taiwan, never to declare full independence. While the J-20 has many attributes, there are still weaknesses. Let’s take a look at five reasons the J-20 is not all that it is cracked up to be.
How Stealthy Is This Airplane?
First, there is the level of stealthiness or lack of stealthiness of the J-20. This subject has varied opinions among aviation experts and amateur enthusiasts. I once received an email from a reader who said he was an aerospace intelligence analyst focused on China. This person implored me to “stop calling the J-20 a stealth airplane.” The intel guru said the J-20’s stealth capabilities are overrated and that it should be described as a fighter jet that only has limited “radar evading attributes.”
He countered that the Mighty Dragon lacks the stealthiness of the F-22 or F-35, meaning it could show up on sensors for those airplanes at long range. However, most journalists and other enthusiasts state the J-20 is a legitimate fifth-generation jet with advanced stealthiness. One problem with the J-20 is its forward canards, which limit the level of its stealthiness and increase the chance of radar detection, so that the Chinese may have made a mistake in its design.
Is the Mighty Dragon Fast Enough?
Second, the J-20 is not the fastest airplane in the world. Its thrust vectoring engines enable a top speed of Mach 2.0. This is respectable but not earth-shattering. It’s faster than the F-35, though, but a tick slower than the F-22. The future American F-47 NGAD and the F/A-XX are expected to be faster than the J-20 if they both enter active duty. These proposed sixth-generation warbirds will have speeds approaching MACH 3.
The Engine Could Be A Failure
Third, the J-20 may have faulty engines. When it first came onto the scene in 2017, it had Russian-made AL-31F engines. China wanted to produce its own homegrown power plant for the J-20 so it would not be beholden to the Russians for a continuous supply. The Chinese desired hundreds of Mighty Dragons, and these kinds of numbers required an indigenously-built engine.
Technicians started installing the upgraded WS-10C. This happened because the Chinese could not quite master the WS-15, although that power plant is running better these days. The engine issue could come back to haunt the People’s Liberation Army Air Force (PLAAF). There are currently between 200 and 400 J-20s, but just how many are in active service and not grounded because of engine problems? This is an issue that the PLAAF must sort out if the Mighty Dragon is going to be a world beater.
The Competition May Be More Maneuverable
Fourth, there is a chance that the J-20 could be overrated in terms of its maneuverability. The F-35 and F-22 are better at climbing and performing high-G maneuvers. Does that mean it is a weak dogfighter compared to the American models? The J-20 may just not be dynamic enough to survive at close range when battling pilots from the US Air Force, the Navy, and the Marine Corps. These experienced and combat-tested aviators could push their airplanes beyond any maneuver that the J-20 can produce. That is actually another weakness. My money is on US pilots who have been fighting air combat engagements since 9/11. The Chinese aviators have no combat history to speak of.
No Gun to Speak Of
Fifth, there is the gun problem. The J-20 has no onboard cannon. It is unclear why the Chinese chose not to pursue this basic form of defense. The Mighty Dragon could run out of missiles in combat, and then what? How could it defend itself? The PLAAF probably figured that most fights would be conducted with beyond-visual-range (BVR) missiles. Indeed, the J-20 comes with the advanced BVR PL-15. This thing is a strong point for the PLAAF. The J-20 can carry four PL-15s internally or eight externally. The Chinese believe that the AESA-radar-equipped long-range missiles could destroy enemy airplanes from long range without the need for an up-close battle that includes guns.
In my mind, the biggest question about the J-20 is the level of stealthiness. I lean toward siding with my friendly pen pal, an intel analyst, who berated me for declaring that the J-20 is fully stealth. The Chinese are known for overhyping their military hardware and for their propaganda industry that trumpets Xi Jinping’s aircraft as the best in the world.
The J-20’s speed and maneuverability aren’t great, and the engine may be problematic. The lack of a gun is a minor consideration for me, as the J-20 is designed to excel in long-range missile strikes.
However, the most significant advantage of the J-20 is in numbers. If we estimate on the high side, there could be as many as 400 Mighty Dragons in the fleet. More are produced each month. The PLAAF is thus confident that the J-20 could overwhelm foes by filling the skies with its fifth-generation airplanes. The numbers game is one in which China is fond of. Saturate the battle space with fighter jets, hoping the long-range PL-15 can take out enemy bandits at beyond-visual range. That means the PLAAF doesn’t have to worry about dog-fighting as much, and the weaknesses of the J-20 will just not matter.
About the Author: Brent M. Eastwood
Brent M. Eastwood, PhD is the author of Don’t Turn Your Back On the World: a Conservative Foreign Policy and Humans, Machines, and Data: Future Trends in Warfare plus two other books. Brent was the founder and CEO of a tech firm that predicted world events using artificial intelligence. He served as a legislative fellow for US Senator Tim Scott and advised the senator on defense and foreign policy issues. He has taught at American University, George Washington University, and George Mason University. Brent is a former US Army Infantry officer. He can be followed on X @BMEastwood.
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