In article , "user" writes:

Nontheless, the rudder balances aileron drag.

To be more precise, the rudder primarily balances the fore/aft
tilting of the lift vectors on the left and right wings,
which is a result of _roll rate_. The aileron drag difference
has a much smaller contribution.
The PDF diagram in this link illustrates the effect:
http://www.rcgroups.com/forums/showp...0&postcount=31


Coordination is simply defined
as balancing the yaw moment from the ailerons with a SIMULTANEOUS and
opposing yaw moment from the rudder. The amount of rudder needed to
compensate for aileron drag is inversely proportional to speed.

Correct.
But the required rudder deflection is actually inversely proportional
to CL, and hence to the _square_ of the speed.