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The Chengdu J-20 is a fifth generation stealth, twin-engine fighter aircraft prototype for the Chinese People's Liberation Army Air Force. In late 2010, the J-20 underwent high speed taxiing tests. The J-20 made its first flight on 11 January 2011. Chinese Army Air Force expect the J-20 to be operational in 2017–2019. The J-20 was one of the stealth fighter programs under the codename J-XX that was launched in the late 1990s. It has been also designated “Project 718”. Two prototypes #2001-01 & #2001–02 have been built as of the end of 2010.
The J-20 is a single-seat, twin-engine aircraft which appears to be somewhat larger and heavier than the comparable Sukhoi T-50 and Lockheed Martin F-22 Raptor. The J-20 may have lower supercruise speed yet greater range and less agility than a Lockheed Martin F-22 Raptor or PAK FA, but might have larger weapon bays and carry more fuel. The J-20 has a long and wide fuselage and low jet engine intakes with a forward chine, a main delta wing, forward canards, a bubble canopy, conventional round engine exhausts and canted all-moving fins. The front section of the J-20 is similarly chiseled as the F-22 Raptor and the body and tail resemble those of the Sukhoi T-50 prototype
The J-20's overall stealth shaping is "without doubt considerably better" than the F-35 and PAK FA, and may be eventually comparable to the F-22, but the excessive number of airfoils on the J-20 will challenge its ability to remain stealthy from all directions. As of January 2011 the engine nozzles were clearly non-stealthy; this may be due to the fact that the final "fifth generation" engines had not been completed yet. However, one of the prototypes uses WS-10G engines with stealthy jagged-edge nozzles and tiles.