New Details on China's J-20 Fighter Provide More Nuanced View of Threat
(Source: Lexington Institute; issued March 2, 2011)

(© Lexington Institute; reproduced by permission)
No new photos of China’s J-20 fighter have surfaced since December 2010, when they were first leaked during US defense secretary Gates’ trip to Beijing. (Chinese internet)
Aerospace experts scrutinizing images of the Chinese J-20 fighter that first began appearing on the internet in late December have developed a more nuanced view of the plane's features than what was available in early reports.

Although the J-20 resembles the outline of the stealthy F-22 Raptor when viewed head-on in its forward aspect, the plane clearly lacks many of the features that make Raptor the most capable air-to-air combat system in history. On the other hand, these same experts believe that over time the Peoples Liberation Army Air Force can evolve the J-20 into a formidable combat aircraft -- especially given the fact that it is expected to operate in or near Chinese airspace, where it will greatly outnumber any attacker's planes.

Early reports that the J-20 exceeds 70 feet in length appear to be wrong. By comparing the scale of the aircraft with adjacent reference objects whose dimensions are known, experts have determined that the fighter is 62 feet long -- the same length as the F-22, and not much different from the 64 feet of the F-15C fighter. Based on overhead imagery and other inputs, wingspan looks to be about 41 feet, also similar to F-22 (45 feet) and F-15C (43 feet). However, the wing area of roughly 630 square feet much more closely resembles the 608 square feet of the F-15C than the 840 square feet on the F-22; this matters a great deal in terms of range since fuel is stored in wing areas.

The J-20's top speed is judged to be below Mach 2, meaning it is significantly slower than an F-22 or F-15C. Little is known about the performance features of the J-20's twin jets, which may be based on technology from the western CFM-56 commercial powerplant first exported 30 years ago. The steady-state thrust provided by the engines is probably similar to the 29,000 lbs of the F-15C, but greatly inferior to the 48,000 lbs generated by the two F119 engines on the Raptor (J-20 maximum thrust of 60,000 lbs comes closer to the 70,000 lbs of F-22, and surpasses the 48,000 lbs of F-15C).

The J-20 does not have the supercruise feature of the F-22 that allows the latter plane to fly at high speed without consuming excessive amounts of fuel, which puts the J-20 at a decided disadvantage given that it carries about 25 percent less fuel internally than the F-22. It also does not have the vectored thrust of the F-22 that provides enhanced aerial agility; the Chinese appear to have modified the fixed exhaust nozzles on the J-20 with an eye to misleading western observers concerning how capable the propulsion system is.

The J-20 airframe incorporates extensive low-observable (stealth) technology into its forward aspect, although it is more readily tracked from side and rear angles. However, even in the forward aspect some design features such as the engine inlets appear sub-optimized for reduction of radar cross-section. It is not clear how extensively designers have used radar-absorbing materials. It is also not clear what kinds of on-board electronics the J-20 will eventually carry in its operational configuration. Electronic sensors, processors and datalinks are the heart of the F-35 Joint Strike Fighter, greatly surpassing the performance of even those on the F-22.

While the J-20 superficially resembles fifth-generation fighters such as the F-22 and F-35, experts do not believe Chinese designers will be able to produce an airframe that comes close to matching the maneuverability, survivability, lethality or situational awareness of an F-22 or F-35.

However, they may not need to if they can lure enemy fighters into Chinese airspace where they have other "home court" advantages. (ends)


Does China's New J-20 Stealth Fighter Have American Technology? (excerpt)
(Source: Center for Strategic and International Studies; issued Jan. 26, 2011)
China’s military sent a signal to Secretary of Defense Robert Gates when it unveiled its new J-20 stealth fighter rolling up and down a runway just before his visit. We do not actually know how stealthy the J-20 is, but aviation experts were generally surprised that China was able to develop this advanced an aircraft as quickly as it did. Some immediately suspected that China had illicitly acquired U.S. technology to help accelerate its own programs. The Chinese, of course, deny this.

The denial counts for very little. We cannot expect a black and white case where close examination of the J-20 would reveal parts stamped “made in USA” on the aircraft. But we can compile a set of suggestive incidents that point to China’s use of U.S. technology.

This is not the first time China has moved more rapidly in building advanced weaponry. It took the United States and the Soviet Union several decades to achieve reductions in the noise emitted by their nuclear submarines, while China achieved similar results in roughly a half the time. Since China does not show similar stellar performance in efforts to develop other advanced technologies—in fact, it tends to be somewhat slower—it is reasonable to ask if China was able to acquire the necessary submarine technologies, which neither the United States nor the Russians would share, through espionage or other illicit means.

We are helped in this analysis by having some knowledge of Chinese acquisitions goals for their espionage programs. This knowledge is derived from the activities of arrested Chinese spies and from their cyber-espionage targets. Stealth, advanced naval technologies (including submarine technology), sensors, and military space are high on their acquisitions list. Nuclear technologies were once at the top of the list, but the Chinese are perhaps now less interested in nuclear because they have already extracted everything of value from the United States.

China is an avid user of open source information (e.g., publicly available material) and presumably uses open source to inform and guide espionage activities collection—a published article can suggest, people, locations, and processes to target for clandestine collection. This is not an argument for publishing less; the United States has wrestled with how to control scientific research since the Reagan administration’s NSDD-189, and the conclusion ever since then is that we gain more from openness than we lose.

China specifically denies that it obtained pieces of an USAF F-117 Stealth aircraft shot down by the Serbs in 1999. This denial is specious. The Serbs retained large portions of the aircraft. China was aiding Serbia in the conflict (it has a signals intelligence unit in Belgrade collecting NATO radio traffic). What better way to repay a friend than by sharing the windfall. It is also likely the Serbs offered aircraft remnants to the Russians, and they may even have been willing to sell it on the black market. This sort of sharing would not be unusual. (end of excerpt)


Click here for the full article (3 pages in PDF format) on the CSIS website.


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