RE: Boomerang XL C o G ????
something doesn't seem right...I have a 160 in mine, CG is fine with engine AFT!
I Did however, in anticipation of the problem, mount 3 4300 duralites waaaaaay up front. Two are just behind the very foremost bulkhead, and one is actually on the FORWARD side of that bulkhead under the radome which I made removeable. Also, and this was a massive pain in the butt, I mounted my fuel and smoke pumps in the nosegear wheel well.