Pilzee, I have been flying this plane for two plus years with a Magnum 120 4-stroke up front. It balanced with no added weight with the servos in the tail positions. My battery is right on the CG. The weight of the Magnum 120 is 33 ounces. Hope this helps. This is a great flying plane when balanced correctly, I love mine, have worn out two sets of tires so far.

Best regards, old bird.