It's possible that they are testing with the Taihang as a failsafe more so than as part of their primary planning for the J-20. I imagine even if the intention were to install a 140-150 kN version of the Taihang the WS-10B might be a good stand-in for the characteristics of such an engine until it finishes prototype development. I guess we'll see, but it doesn't seem to me that the PLAAF values indigenization so much that they would go with reduced capabilities on their premier fighter, especially since they've already bit the bullet on entering production with a Russian engine (but maybe that alone is indication that they aren't in fact using the M2s)... and even further: how soon will the flight-testings are concluded and if or when thereafter this Taihang-variant will replace the AL-31 also on production aircraft?
I got around ITR 34 for one video ... it was the one with two J-20's performing for the Zhuhai demo.We've seen video footages of the J-20 doing tight half turn, but, AFAIK, there's no footage of the J-20 doing a sustained turn in a full circle. So, it's impossible to estimate the J-20's STR in this way.
The Liyang insider says that the WS-10B is generates around 14 tonnes of thrust, so in that range.It's possible that they are testing with the Taihang as a failsafe more so than as part of their primary planning for the J-20. I imagine even if the intention were to install a 140-150 kN version of the Taihang the WS-10B might be a good stand-in for the characteristics of such an engine until it finishes prototype development. I guess we'll see, but it doesn't seem to me that the PLAAF values indigenization so much that they would go with reduced capabilities on their premier fighter, especially since they've already bit the bullet on entering production with a Russian engine (but maybe that alone is indication that they aren't in fact using the M2s).