[F3AFlyer7]

Biff,

I'm not sure specifically why some planes rock more than others but I do know this:

The reason that planes rock is an inbalance of lift between the two wingtips. If a plane is locked in a harrier perfectly (no wing rock), the airflow over both wingtips are equal, resulting in equal pressure ofer the top and bottom of the wing, resulting in no wing rock. When the plane begins to rock, one wingtip starts flying while the other is in a stall, causing the flying one to move upward and the stalled one to plummit. Once the stalled wing regains sufficient airflow again, it begins to reverse its direction thus creating the back and forth oscilation. One thing to note is that the more "higher alpaha" or the more of an angle of attack you put the nose of the aircraft in, the less ability the wings have to create lift. And because the wingtip is such a small part of the total wing area, it stops flying sooner than the wing root. Therefore, the higher angle of attack you fly the airplane in a harrier, the easier it should be to lock it in a harrier. The hard part is finding the sweet spot as to keep a forward moving track. This is why an airplane begins to "lock in" as you pull farther into a hover. I don't know where I just pulled this all from.