Originally Posted by Firemaster
This doesn't do with copy. If you bother to read the previous post. The method to compose in metallurgy is all self effort and patent. Which means doing or devise their own way to get the require material. WS-10 is indeed a intellect property of china through it's own effort and years of development. That is why china is able to overhaul many parts of AL-31FN engine with extended life time but is not able to RE it. Unless the russia totally provide all the know how.
Look at turkey, producing engine parts for American for such a long time but until now still not able to produce a single indigenous engine of their own. Becos producing parts and totally understNd the know how is different. And crucial part like engine blade might be withheld by Americans.