This got to be the most outrageously tight turn by J-20, I have seen yet. It did a 180 degree U-turn in about 3-4 seconds. It literally just flip around at the bend of the U shape, which lasted about 1 second.
I made the gif files from the original video. The time of the turns is deduced from the original videos. A 3-4 seconds, 180 degrees U-turn is a stunning performance for any aircraft.
This one is done with the usual deep banking like other airplanes.
This one is done without the deep banking.
Watch the segments from 1:01 to 1:04, and 1:20 to 1:26 on this original video.
Why is doing a tight turn without deep banking useful in a dogfight?
When the pilot doing a tight turn with
deep banking, his head is point to the center of the turn, and the blood is pulled by the
centripetal force toward his legs. At sustained high G, the pilot is prone to blackout (lost of consciousness), or greyout (lost his vision), because of lack of blood flow to his head. Also he will be having a hard time to keep his opponent in his sight. His head will be very heavy and turning of his head will be very difficult. He will have a hard time to follow his opponent, around the turn, long enough to get a good lock, to fire his weapon, with his Helmet Mounted Sight.
When you turn
without the need of
deep banking, you don't have those problems as much. You will be sitting horizontal, with your head up, like driving a car, around a turn. You will be pushed toward the window, instead of toward the floor by the G-force. Your blood will not be pull toward the floor or legs as much, so your tolerance to high-G force will be much greater. And your head will be much easier to turn, and able to watch your opponent over your shoulder, and aim your weapon using your HMS.
You could fire your missile, even your opponent is at 60 degrees or more from you.
If both planes have High-Off BoreSight missiles and HMS, the pilot who could turn his head more easily, to track his opponent, will achieve a firing solution first, and fire his missile first, and therefore kill first.
"Being able to look outside the cockpit and ‘see’ all the contacts around them highlighted by glowing symbology would be a huge situational awareness boost, and
the ability to target enemy aircraft at short range, without having to point the jet’s nose at them, could mean the difference between winning and losing in a dogfight."
http://foxtrotalpha.jalopnik.com/why-its-sad-that-the-f-22-just-fired-its-first-guided-a-1704889474