I used the engine to balance mine. There is not a lot of choice on servo and battery location. So I installed everything but the engine. Then set it inverted on the CG machine. I had the prop and spinner and muffler on the engine already. Then I set the engine on the bottom of the mounts and slid it back and forth until the CG was where I wanted it. It's very easy to do on a plane like this where everything is open at the front.


David