nrp wrote:
I should have clarified the sentence & said for takeoffs only. It
already takes right rudder in a zero wind to compensate for the
rotating slipstream etc, but it takes still more right rudder for any
left crosswind. The result for me (C172M) is that a 10 knot left
crosswind is like a 20 knot right crosswind in terms of rudder-needs
and pucker factor.

I'm still not sure I follow you. If your objective immediately after
takeoff was to have the fuselage aligned with the runway, as it is
immediately before landing, I'd agree that more rudder would be
required against the rudder weathervaning. Takeoff is not the same as
landing in this respect though. Upon liftoff you should make a
_coordinated_ turn into the wind in order to add the appropriate amount
of crab angle required to stay above the runway (left aileron and left
rudder into a left crosswind). Asymmetric rudder usage shouldn't
really apply, I think, aside from the usual net left-turning
tendencies.

If you're not flying in a coordinated manner on takeoff you're throwing
away performance and operating at less than optimal efficiency - at a
time when you can use all the performance you can get.

Or maybe I'm misunderstanding. I'm still licensed to learn.

-R