You DO NOT want to be tail heavy in this plane The tail is way over sensative, and makes flying and landing really touchy. If anything put the weight up front, I added the weight box and then added 6oz in the cowel as far forward as I could. The battery is all the way against the firewall. I ordered a heavy prop nut and hopfully can take out some of the weight in the weight box. It does fly much better now. Watch the ground looping on take off.