Darrell S schrieb:

That said, most aircraft require a pilot input of rudder to coordinate a
roll input. Little, if any, rudder is required once the roll stops and a
constant bank is maintained.

Ever flown a glider? You'd be surprized! A coordinated turn is *always*
a turn around all three axis.

If some powered airplanes don't require rudder, it's because a) the
rudder is somehow coupled to the ailerons, b) the weight of the engine
will cause the nose to drop enough without rudder or c) the pilot
doesn't care enough about being coordinated. My experience says that
power-only pilots tend to solution c). (Note: The ball is a pretty
coarse instrument.)

Stefan