Supermaneuverability has no clean and clear definition. Post-stall maneuverability, which maneuvers such as the Cobra are classified as, are a trait of so called "supermaneuverability." This classification supposes the Su-27 as being supermaneuverable due to a high thrust:weight ratio and ability to perform at high alpha levels. QED the Su-27 can be defined as supermaneuverable. And by radar lock I meant useful radar lock. When an enemy aircraft is capable of firing a weapon which is radar guided and actually having a pK of over zero, then the radar lock is useful. Otherwise, it gives you a circle on your HUD to let you know that the person is behind you now. With the loss of speed and suddenness of the maneuver, the other pilot will be hard pressed, given an engagement of less than 200 meters, which is a small distance, mind, but that points to the defensive pilot's ability and airframe potential, to actually react in a timely manner in order to keep the defending aircraft within his gun zone. Thus, useful radar lock is broken and the defender becomes the attacker. Like I said, "The [engagement] that doesn't happen."