The tailwheel should only castor when on the ground when sufficient
breakout force is exerted. In flight, the wheel detent should engage and
the wheel should move with the rudder. The tailwheel springs center the
tailwheel when the weight is off the wheel.

Thomas Ploch wrote:
What I would really like to know, and don't seem to find anywhere, is
how is a tailwheel like a Scott SUPPOSED to work. In other words, is
the released condition only for performing tight ground manuvers or is
it expected to release or castor in other situations? Does it
release differently when there is weight on the tailwheel than when I
have the tail raised during preflight inspection? Overall, I would say
the functioning of entire tailwheel mechanism is a little bit of a
mystery.