RE: Setting up airplane rudder gyro
Your second statement said more than your first statement did, and indicates you just need practice on the rudder, and a Cub is a great plane to teach you how to use one. Gyro on a rudder is sure to help it track like you want, but won't teach you a thing about how to do it yourself. Sort of like buying a trainer and trying to learn how to fly it by watching someone else do it for you.