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 From the operation, the barrel roll is not complicated, as long as the pull rod or press rod is, hold down one side of the roll key can be, you can also step on the rudder key on the same side to assist the roll (for some rudder is easy to overstep, such as yak-190, step on the rudder should be appropriate, such as click), or reverse side to slow down the roll (but here mainly talk about defense barrel roll). The real question is when to use the defensive copper roll, what type is appropriate and maneuvering simultaneously SA.
 For SA, keyboard maneuver has a higher priority than mouse maneuver. For example, the mouse can be observed at will when the rod is full, that is, the mouse can always observe the enemy aircraft behind it. For fighting is similar, to try to ensure that you can see the enemy aircraft when fighting, lost also to know what position it is in.

For the model, the defense pain roll is suitable for rolling good, such as 190, and the roll bad like typhoon is generally not done (including rolling shear) (high-speed maneuver and rolling performance, saving energy is also more important, like 152H is too good, want to make the opposite ahead is more difficult). At the same time, when entering the barrel roll, it is necessary to control the more appropriate speed segment and try to ensure that there is a certain height (there is no height and the energy difference is large and it is more miserable to be crushed by energy).

 The appropriate speed is to ensure that they have good maneuverability at this speed, including roll and positive rod, barrel roll is generally used to defend against enemy aircraft when they launch BZ from the top rear. As with all attacks, find and regain speed, height, and space early.
 Here is the general process, but it should be judged on a case-by-case basis. When the opposite side approaches the firing distance, the steering belt is angled, and then the line is brought into the barrel roll (or roll scissors). When continuously following the maneuver on the opposite side, the field of vision continues to observe the rear, and the oil can be collected if necessary. When making copper rolls (the same as before the roller shear cross disadvantage) stagger the lift line to avoid being hit. After entering the rolling shear (because the opposite side is faster and may even lock the rudder, generally fooling the opposite side to lead), the lift line is aligned with the opposite side. On the opposite side of the head, want to pull out of the path in advance and prepare to fire back. If the energy gap is large enough to keep up with the judgment, give up as soon as possible. If the other party gives up approaching and pulls up, do not do extra maneuvering, but continue to recover energy and observe the opposite side at any time.
 Go try it in the field