Originally Posted by tphuang

Yeah, J-10 is based Lavi. It does have some commonalities with F-16, but all of the calculations and design still had to be done by CAC. Calculations had to be done because we were using AL-31FN instead of the American engine. Also, I'm sure the canard, the variable intakes and delta wings aren't things you see on F-16. All of the avionics and stuff like that are all home-made also.

As for J-11B, it is still licensed production of su-27, but all the avionics, AAMs and engine are all developed by Chinese companies. Actually, they were all developed for J-10, but we were so unsatified with the Russian systems that we just put all of them on J-11. Only the airframe is still based on the flankers, but even that is 100% domestically made now.

So, it's unlikely that China will buy anymore fighters from Russia in the future. The Chinese fifth generation plane went into wind tunnel 2 years ago, so who knows, it might come out before PAK-FA does.