To learn a rolling circle takes practice in a few areas
1) Master your straight and level slow rolls first

A slow roll should be one were in every position you are in control, and can stop and continue to fly straight and level. To do this you must use all control inputs at some point in the roll. There will also be times in the roll were three inputs will be used in conjunction. For example at the beginning you will initially start the roll and set its speed with either left or right ail input;

At the 45 degree mark you will slowly start to add top rudder(Left for a Right roll or Right for a left roll) , the trick is to learn just how much to give while the plane is rolling to keep that nose level(give to much at first and the plane will veer to the top left in a right roll and vica verca in a left roll)

At the 90degree mark you also should be holding in just enough rudder to keep the nose level. Know you should start to decrease the rudder input as the plane continues its roll to the 135 degree mark. Somewhere near the 135 degree mark i also start feeding in down elevator at the same time I'm releasing the rudder input.

At the 180 degree mark all of my rudder input is gone and only enough down elevator is given to STILL hold my nose level.

As you continue the roll everything else is just the opposite except for the ail position which holds constant and controls the speed of the roll which you can speed up or slow down.


2) Start learning to time your regular slow roll inputs so that you can direct were the nose points while in the roll.

To do this just think back at what you did in the first 45 degrees of your slow roll, You started to give just enough rudder to hold the nose level while on your way to the 90 degree mark.
well what if you started to give rudder at the 22 degree mark and you then had full rudder at the 45 degree mark.
You could still give just enough to hold the nose level but because you started to add rudder slightly earlier the nose will know be pushing to the left in a right roll.

You then start to back of rudder from the 45 to 90 degree marks and start adding down elevator. add the 90 degree mark equal amounts of rudder and down elevator are being applied.

Your full down elevator input will be given at the 135 degrees
from this point on your know adding opposite rudder while releasing elevator.

This all may seem like gibberish but what I'm basically trying to show is that the timing of when you apply these commands is whats steering the nose in the direction of were you want it to go.
A fellow rcu user gave me some advice which helped me out tremendously, He said to fly realflight G2 with the wind set to about 45 or 50 mph and try to do slow rolls right in front of you. You can instantly see what commands are needed to keep the plane level and in the direction you want to go.

I hope the long post will be helpful....