On Oct 21, 3:56 am, Bertie the Bunyip wrote:
wrote in news:1192935582.999886.201640
@t8g2000prg.googlegroups.com:



In addition to what others have said, another interesting question to
ponder is why the airplane yaws when you bank.

The yaw is induced by the ailerons, so the only time you need to apply
rudder is when you are changing your bank angle with the ailerons. On
the side where the aileron is down, the wing has more lift, and more
drag. On the other side, the lift is spoiled and there is less drag.
The draggy wing yaws backwards, requiring opposite rudder.

that's adverse yaw. I beleive he meant why does the airplane yaw in the
same direction (eventually) as the direction of roll?

Bertie



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Bertie,

I assumed that adverse yaw was what he was asking about since it is
the most pronounced effect.

To answer the question the other way:

The reason for rudder use in a sustained bank is due to the fact that
the airspeed of the outside wing is slightly higher than the airspeed
of the inside wing due to the difference in arc-distance that each
wing is traveling in a turn. The outside wing has a little more drag
due to the higher airspeed and a little bit of rudder is required to
compensate.

Dean