Asoka
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I believe the engine used on J-20 currently is hybrid of WS-10 tech and AL-31F with much superior metallurgy. The reason for not disclosing the engine and data might be due to IP right of AL-31F or antagonised the Russian again with IP issue again since there is a Sino Russo alliance going on.
Remember the video I posted abt AVIC chairman talking about WS-10 Taihang engine has a massive issue which the engineer that time believe 下马. Is the only solution for Taihang engine. Surely only design problem will warrant a cease production call.
Lin Zuoming did not disclose much how he overcome the taihang problem. I believe his solution is not fully RE AL-31F but by borrowing some of the proven design of it and implement on Taihang engine to make it work or success. That is why China don't want to talk too much about this new hybrid engine.
"I believe the engine used on J-20 currently is hybrid of WS-10 tech and AL-31F with much superior metallurgy. "
I agreed. The J-20 engine has WS-10 and AL-31FN technology, but the engine core is WS-15. This is an important point to be emphasized.
When the maximum power (>200kN, IMO) of WS-15 is finally revealed, it will be very shocking. F-22's 160kN engine will be completely outclassed by WS-15.