Question about CG of GP Eagle 580
 

Looking for someone with a GP Matt Chapman Eagle 580 40 size with a 55AX engine. I am using a pitts muffler. I just finished building it and as per the 95 mm CG, it is extremely tail heavy. I would have to place the battery under the engine. So even if I place it under the tank, I would still have to add weight to the nose. Is that possible? Thanks,