ChineseTiger1986
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no, anyone can come-up with a seemly detailed "development timeline"``````there are two VERY important engines still under development, one has started air test some time in 2016``````````
Now we can hope that the WS-15 is going smoothly and can conduct its maiden flight around 2020.
The US will very likely start the development of the 6th gen aircraft in the 2020s, and the earlier engine for their 6th gen aircraft will likely be the improved version of the F119.
So by 2030, both China and USA will test their 6th gen aircraft, the improved WS-15 for China's earlier 6th gen, and the improved F119 for USA's earlier 6th gen.
Check here is the brief concept of the US 6th gen aircraft. Although it is just a concept, but I do believe the US has started to plan their 6th gen project.
That's why the role of the WS-15 will extremely crucial, it will serve as the backbone for the later J-20 and play the transitional role for China's earlier 6th gen aircraft.
That's why the F119 won't be retired soon, it will also sustain the earlier model for the US 6th gen aircraft.