成飛那架從照片上看很明顯有split rudder。B-2是不需隱身是用split rudder，需要隱身時不用split rudder，因為使用split rudder降低隱身性。我們不清楚成飛那架是任何時候都使用split rudder，還是像B-2那樣隻有不需要隱身時才用split rudder.
至於B-21則是完全不用split rudder。因此至少在這方麵，B-21的隱身技術超過B-2及成飛那架。成飛那架在這方麵，至多隻到B-2的水平，也就是五代機的水平。
Reference: https://hushkit.net/2023/11/16/why-the-new-b-21-raider-stealth-bomber-look-the-way-it-does/
Excerpt 1:
The B-2 users split drag rudders for directional control when not in stealth mode, while relying on differential thrust and the remaining control surfaces when LO is vital.
Excerpt 2:
The B-21 geometry is consistent with advances in both predictive tools and confidence gained from related LO platforms. The elimination of the split rudders and potential exploitation of proverse yaw is an example.
