I have an OS46Ax, 2 standard servos on the tail for both the elevator and rudder and digitals for the rest. I put my 1100 battery up above the tank and still needed 1.5oz under the tank to get the CG at 4 1/2. Digital servos are heavier so if you use them in the tail section you will need more weight up front.

Use a 12.25X3.75 APC and this plane will rock.[sm=spinnyeyes.gif]