S and D nomenclature is based on Chinese pinyin. S stands for 双 (pronounced “Shuang”), which means “dual/twin”. D stands for 电 (pronounced “Dian”), which means electronic.What's the difference between the S and D?
Seen on previous exercises on the Liaoning, yes. They should reflect the standard combat loadout of the planes.
I just did a stroll on Huitongs blog and from what I could tell of all the confirmed airframe serials in service all of them are the vanilla so I wonder are J-15S and J-15D just demonstrator aircraft?
FWIW, a poster from Shenyang. I wonder if the artist simply took J-10B/C's canted nose and stuck it on there for cool effect, or if there is something to it. Take it with a very generous serving of salt.