ORIGINAL: DKjens
Doesn't just about every radio sold today come with the option of dialing in aileron differential? Of course that doesn't work where a single servo controls both ailerons. I don't use aileron differential because I don't care to use the rudder, I use it to obtain axial rolls; I doubt the rudder can help me much there.
DKjens
The rudder can indeed help you there. It can be used to stop adverse yaw beginning the roll, and to cause the fuselage to generate lift during the roll. It's common to get off heading slightly opposite the direction of roll - a tiny blip of rudder at the beginning of the roll can help prevent that.
I have never seen an adequate defenition of the term "axial roll". I don't think I like it, as to perform a proper roll requires that the longitudinal axis of the airplane rotate (nose) up and down somewhat during the roll.