I recall many state released info (from interviews and whatnot) indicating J-20's supercruise ability and how lightweight it is for a 5th gen fighter. This doesn't mean it is as lightweight as a similarly large 4th gen fighter but many advanced in materials and manufacturing have allowed J-20 to be lighter than it would otherwise be.
There were some nearly unbelievable figures hinted at in the past (around 3 or 4 years ago?) and shows the J-20 is nearly as "light" as a similarly large Flanker.
There were also leaks even further in the past where the FC-31 program was said to be using entirely new (in fact world first) 3D printing titanium of many bulkheads and sections with one shown. This would have only been a few years after the FC-31 first prototype was shown to the public. One can only imagine what the actual abilities already are at many years after the revelation of this info considered "dated" and not so sensitive by the state.
There were some nearly unbelievable figures hinted at in the past (around 3 or 4 years ago?) and shows the J-20 is nearly as "light" as a similarly large Flanker.
There were also leaks even further in the past where the FC-31 program was said to be using entirely new (in fact world first) 3D printing titanium of many bulkheads and sections with one shown. This would have only been a few years after the FC-31 first prototype was shown to the public. One can only imagine what the actual abilities already are at many years after the revelation of this info considered "dated" and not so sensitive by the state.
