I'm not sure that I would trust a standard servo on ailerons that large, especially with a big 4 stroke in the nose. I would go with servos with a minimum of 75 oz. You will also notice that you will need more aileron differential. I personally would start with 1/2" up and 3/8" down. If that proves to be not enough ( which I doubt ) then go with 5/8" up and 1/2" down.