Originally posted by Hal deBolt
The reason for the differential is complex. but the resultant is
simple. Down aileron simply creates more drag than up, so the
up aileron movement is increased to equalize drag.
I simply can not agree with this statement. IMHO when the AOA is 0 this is not true. Both ailerons create equal drag on a symmetrical wing(if they move the same amount). I think everyone will agree that a symmetrical wing flying level does have an AOA. In that case your statement is true.
The original post was referring to the effect of differential when inverted. How it actually becomes reversed, which I agree with. I'm not sure why we got in to the discussion about yaw. I thought differential was used to correct how axial a plane rolls, not trying to subdue yaw. Well, except maybe on a glider which doesn't really care about rolling that much
BTW I think most of us are saying the same thing, just in different ways. I am always amazed at the wealth of knowledge everyone has (I mean that in a positive way!).