Allows the pilot?Pilot from Anshan who recently switched to J-20 with WS-10 engines claims that there has been an appreciable improvement in handling and maneuverability (compared with J-11B). The flight control system is also excellent and allows the pilot
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I suspect a more complex TVC nozzle would not be shorter than a standard nozzle, and it would have no effect on the length of the afterburner before it. So WS-10 with TVC won’t be noticeably shorter than a standard WS-10. In any case, if the WS-10 with TVC nozzle was shorter than one with a normal nozzle, that would have been obvious on the J-10 testbed for the TVC nozzle.
So my hunch is the fact that one engine ends further forward then the other implies the shorter engine has a shorter core or shorter afterburner. The Chinese have no known trouble with afterburner technology and if the afterburner for the WS-10 could have been made shorter, the Chinese would have made it shorter to start with. This suggest the shorter engine has a shorter core. A substantially shorter engine with the same or greater output suggest fewer fan, compressor or turbine stages and better blade technology. Such a drastic configuration difference strongly suggest it is a new engine, ie WS-15.
So If the photo showing a shorter engine on the J20 isn’t a piece of fanboy photoshop work, then my money I’d it shows a genuine WS-15 engine on that J20.