Do not go beyond 6" CG. I would say 5 7/8"-6" would be optimal and maintain enough stablility to land it. Mine is at 6" and its tricky to land that way, put it at the recommended and the plane flies on rails but it wont 3D too well.


As far as the fuel tank capacity,I run the OS .91FS w/15x6APC Prop balls to the wall and I get 12 minutes easy. I have run as long as 16 hard minutes and landed on fumes.