I'll tell you, I have a Brison 2.4, CH ignition, and a 1400mAh ignition NiCad all in the nose of my Edge along with the single pull-pull elevator servo and a fuel tank mounted under the radio/battery tray and mine is now balancing just a shade behind 5". I have both of my servo power batteries mounted in the tail of the plane about 1/2 way back, but I have done nothing else to alter the stock airplane. Mine flies GREAT at this CG location and is just night and day from when I ATTEMPTED to fly at the recommended location.