Hi Mark,

On 07 Aug 2008 23:44:00 GMT, (Mark Drela) wrote:

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.

Flying an open class glider with pretty limited roll rate, I can
assure you that roll rate does NOT influence adverse yaw at all.

As Don Johnstone already pointed out, adverse yaw is caused mainly by
induced drag.


Bye
Andreas