Michael,
At 100mm the plane balanced perfect. I lucked out with centering the battery in front of the servo's. As you can see in the picture, I mounted the motor sideways and put on a Slimline pits muffler. I think I overpowered it by putting a 52 on it. I have not opened it up full throttle for the fear of ripping it apart. All I no is vertical is unlimited,,,,, I think a 46 would be perfect.

Hoss