Thanks. So to the question of why is it tail heavy. The answer is there is no obvious reason it is, other than that it is. It is an old hanger 9 ARF that I am rebuilding ( http://www.rcuniverse.com/forum/m_11...m.htm#11512195
). The specification is for a CG of 3 1/4 " back from the leading edge measured at the fuselage. It was VERY tail heavy the day I got it. It had a brass heavy nose prop nut (6+ Oz) plus 1.3 Oz of weight on the firewall that all with a 20oz four stroke motor. (it flew fine like that as well btw). I decided to recover it and investigate the tail weight while all the covering was off. I didn't find anything obvious (you can see the pictures). There is no fuel soaked wood or weight in the tail. My only thought is the elevators are solid wood. In a previous post I also investigated if I was just simply balancing it wrong (which in part I was but I was close). I moved the battery as far forward as I can and moved the throttle servo forward as well. I added a fiberglass cowl and change the landing gear. With no weight it balances at about 4" back from the leading edge. To get it to the 3 1/4 mark stated by the manufacturer, I need to add weight (a lot to have any effect). I know it doesn't mean much but If I remove the wing I can balance it on the CG with no weight I bugs me because it also states it is supposed to be about 7 lbs flying weight and its more like 8.5 - 9 lbs. (with 850 Sq surface area) I may make new elevators some day and I also plan to recover the wing but I have conceded and im just going to fly it for now.