Sorry about that, Not meant to be smart ass or anything.

I have a SIG Extra 300 XS and I used 1-77 oz.in. servo on each aileron (hitec) One of same on each aileron half with a miracle "Y" connector to balance them out and One 77 oz.in. Hitec on the rudder with a pull pull system. Throttle was a standard 48 oz.in. futaba servo. I should have used two on the rudder but was trying to save some money. It worked ok but could have been a little more authoratative.

I have since had a minor mishap with the plane and am going to do some remodeling on it. Got to put the firewall back in, and going to a smaller engine. G-38 is too much engine for this airframe. Too much weight and too much thrust.

One VERY important factor to remember is to check your firewall and make sure it is sufficiently strong to handle the engine your going to use. I learned the hard way.

Now I get to remodel and make it right.
Check out some of the guys that fly the giant scale airplanes and larger to see how they hook up their servos and what they use.

What size is the airplane? What engine is it rated for?