ORIGINAL: nedyob
This is kinda the norm, so bear with me and if Im not quite right someone please jump in to correct me.
okay, when your prop is turning, and your rudder is in nutral, air is pushed back and hits the right side of the rudder.
when you apply right or left rudder (rudder when applied causes the fus to yaw from side to side) this interups the flow of air and slows the plane down. Some people apply right rudder when landing to slow the plane down on approach. then nutralize the rudder just before touch down. When taking off, you apply alittle right to help with engine torque.
Basicly when you fly with rudder in windy condition always point the rudder into the wind for rudder correction.
One thing you might try with your trainer is take a Y-harness and plug the rudder servo into one Y and the aileron servo into the other Y, then plug the other connector into the aileron channel on your reciever. To make shur your rudder is turning the right. apply right aileron and rudder sould turn right and apply left aileron and rudder sould turn left.
Remember your rudder stick will not work, and will only work with Aileron inputs. Then when you see how the rudder smooths out your loops and turns and want to go back to using the rudder stick, always remember to apply rudder towards the wind thats pushing at the plane.
Hope this helps!
NEDYOB
No, Definitely do NOT y-harness the rudder to the ailerons..
It is not that the rudder slows the plane down (when you start learning to land dead stick, you will learn to love your rudder because it keeps you in the air LONGER).
It is good to use the rudder to smooth out turns, but when you want to do this with your radio, you do it by mixing in a bit of rudder to the ailerons, not y-harnessing. It is good practice to do it manually though. Best to not be lazy while you are learning.