Defense 
Secretary Robert Gates has acknowledged that China’s efforts to develop a stealth combat aircraft may be more advanced than the United States previously thought. “We knew they were working on a stealth aircraft. I think that what we’ve seen is that they may be somewhat further ahead in the development of that aircraft than our intelligence had earlier predicted,” he told reporters Saturday while traveling aboard his aircraft to Beijing on the first leg of his Asia trip. A reporter had asked him about the recently revealed Chinese J-20 aircraft, which appears to be a stealth design. Gates said “there is some question about just how stealthy” the J-20 is. Despite the J-20’s emergence, Gates said, he “continue[s] to stand” by his earlier assertion that there will be “a vast disparity in the number of deployed fifth generation aircraft” that the United States has by the middle of next decade compared to China or any other nation. That’s even with the changes being made to the F-35 strike fighter program, he noted. (Gates transcript) (See also China Joins the Stealth Club)
The F-47 fighter will be run differently than previous fighter programs and share the same mission systems architecture as the Collaborative Combat Aircraft, Air Force Chief of Staff Gen. David Allvin told the Senate Armed Services Committee. That means advances in one will fuel advances in the other.