AdmiralHam,

With a trainer, it is hard to tell if the plane is really responding since it was designed to be controlled by the ailerons. In order to really get the feel for using rudder to control the aircraft, you need to get into a plane such as a 4 star, Cub, Supersportster, etc. These intermediate trainers have more rudder surface area but are still forgiving if you lose control.

The main purpose for learning rudder is to be able to control a wide variety of aircraft designs in different flying conditions. Whether your flying Warbirds, 3D, or your trainer in a gusty cross-wind.