I just built an Ace 4-60 and it is HEAVY. I don't have the instructions for it and the plans don't show CG. If I support this thing at the main spar, it is seriously tail heavy. It has an OS Max .60 FSR in it mounted all the way to the front of the engine mount beams and both the battery and receiver are mounted against the bulk head between the fuel tank bay and the radio compartmentcan't get them any further forward. And it STILL hangs tail down. Does anyone know where the CG is supposed to be? If it's supposed to be somewhere around the main spar, I'm gonna have to put an anvil in the front of it to achieve balance.