J-10C may be more stealthy with new thrust vectoring nozzle

The photo, shows a Chengdu J-10C fighter flying with a modified exhaust nozzle for its indigenous Shenyang-Liming WS-10 Taihang turbofan engine.

A recent image showed the J-10 with a number of upgrades that haven't been seen before, including a new engine with "sawtooth" edges that make the engine less noticeable on enemy air radars. Engine specialists say that radar signals reflect well off straight lines, but that sawtooth patterns can smother the radar return.

J-10C TVC-testbed - magazine cover via https://t.co/EjnfL8dZwc pic.twitter.com/wo7pykcV90

— @Rupprecht_A (@RupprechtDeino) April 3, 2018

WS-10Bの推力偏向ノズルの構造 pic.twitter.com/0MRRHliiZX

— OedoSoldier (@OedoSoldier) April 4, 2018

The TVC aspect of the engine increases the plane's angular velocity during flight by slightly repositioning the engine itself so as to manipulate the thrust created by the engine.
J-10Cs feature a number of improvements over earlier versions, which include a Diverterless Supersonic Inlet, improved electronic warfare capabilities and an active electronically scanned array radar.
The new developments will allow the J-10 to make more precise maneuvers in the air while giving pilots more control over altitude changes. The US' F-22 Raptor and the Su-30/35 family of aircraft make use of TVC as well.