What are the major changes from the russian to the chinese flanker ?
1) Which variant? J-11A/B, J-15, or J-16?
2) In the case of J-11A: almost nothing.
3) In the case of J-11B. Radar change from Cassegrain to slotted planar array. Higher use of composites and other advanced material. Second batch onward J-11Bs used domestically made WS-10 engines instead of AL-31Fs. J-11B also employs more advanced avionics and extensively used LCD displays to replace mechanical dials within the cockpit.
4) In the case of J-15, pretty much the same changes as J-11B with the exception of domestic engine usage.
5) In the case of J-16, radar change from Cassegrain to AESA radar and many of the same changes as J-11B.