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Washington believes the J-20 could achieve an "effective operational capability" by 2018, and suggests the aircraft's role is as not a fighter, but rather a long-range attack platform. It says engine technology is the main challenge China will face in developing the J-20.
There has been debate in defence circles as to the exact role of the J-20. Some have speculated that it is intended as a direct rival to the Lockheed Martin F-35 Lightning II fighter. Another popular theory indicates that it is designed specially for long-range attacks against American aircraft carriers and other targets.
"The stealth shaping is without doubt considerably better than that seen in the Russian T-50 PAK-FA prototypes and, even more so, than that seen in the intended production configuration of the F-35 Joint Strike Fighter. "
and that
"Any notion that an F-35 Joint Strike Fighter or F/A-18E/F Super Hornet will be capable of competing against this Chengdu design in air combat, let alone penetrate airspace defended by this fighter, would be simply absurd."
and that
"The US Navy F/A-18E/F Super Hornet is outclassed in every respect, and would be as ineffective against a mature J-XX [J-20] as it is against the F-22A Raptor."
and it even concludes by saying:
"The material reality is simple. If the United States does not reverse course in its tactical air fleet and air defence recapitalisation planning, the United States will lose the Pacific Rim to China, with all of the practical and grand strategic consequences which follow from that."