"He mentioned a few scary attempts with the cobra when pilots attempted this at too high a speed, and instead of performing the cobra, the airplane pulled as much as 15 G's in a standard, albeit very small pitch up"----->
From http://aeroweb.lucia.it/~agretch/RAFAQ/cobra.html

15Gㄟ.....嚇死倫....一般飛行員能承受7G...戰機標準設計大約都維持在9G....因為9G以上飛行員會產生昏迷或是腦沖血的"紅視"現象 SU-27做cobra時飛行員標準承受15G抗力.....真是夠了
我期待台海戰爭時 看SU-27一架架自動落海..........