RE: Loop tracking
This is for 3D setup on the Funtana but also appllies to other 3D planes. Simply stated one wing stalls before the other, causing the plane to feel like you lost your ailerons (its actually doing a slow snap). This is when you are flying 3D, normally. What the rudder does is keeps that wing from stalling before the other one.
Now, for RC Pattern, this technique works well to keep the plane from "breaking" in a snap one direction. I would set it up on condidtion so when I go into a spin entry it pops in about 1/8 of rudder which makes the plane stall straight ahead) with no surprises on snap entry. The condition is off the other times, allowing no change to uplines for example.
Don