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i was guessing correctly , however the link of the picture i had posted previously , is dead so i will post houshangai's version of pictures
there are small changes of canard between j10b pt 01 and j10b pt 05
I saw same on F16 block50/52
here is J-10BS Scheme from defence production journal
New Recruit
These are conformal fuel tanks (CFT). They can be attached to the aircraft in a small amount of time to give it more range while minimizing performance loss.
Why dont we see it on current J-10As/B?
looks like Twin seater Trainer and Attack versionJ10BS - Is it a naval variant OR twin seater version ?
C. Supersonic cruise
About a year ago reported that YST have seen J-10 supersonic cruise can do short (like 15 minutes), YST guess may be experimenting with new research and development of turbofan-10II (WS-10B) to achieve.
But in China the focus of the target aircraft engines should be "Taihang", currently in production with a small amount of test equipment situation. Recently "Taihang" engine in a growing number of domestic J-11B fighters, and even special emphasis will be installed in the future on the J-15 aircraft carrier, "Taihang" engine reliability will be improved step by step.
J-10B's size and empty weight is only 8.6 tons, smaller than the F-16 **, body light, if equipped with the "Taihang" engine is certainly capable of supersonic cruise for a long time.
D. Invisible
J-10B in the shape significant changes in online leak of the news is an order of magnitude lower RCS. In fact, J-10A when the design has stealth considerations (such as BWB), RCS will not exceed 3m2. If the J-10B to reduce the RCS of an order of magnitude, then it the RCS should be in 0. 3m2 so. In accordance with the definition of YST, RCS is less than 1 is called stealth fighter aircraft, so J-10B could be included in a low-end of the stealth fighter.
Why dont we see it on current J-10As/B?