Sorry - I forgot about the cg for the Bombshell. The plan shows it 4" behind the leading edge and that's where I have it on mine.

If I build another of these, or any other free flight converted to rc, I will reduce the dihedral quite a bit. Most of these were meant to be hand launched and they are quite squirrely to take off in grass. I believe this is due to the unequal drag on the wheels caused by irregularities in the grass causing yaw and therefor unequal angle of attack/lift on the wings. Less dihedral would reduce this problem. Since we can control the plane in flight, less dihedral is necessary. Anyway, I'm going to try it in my next one or may just build another wing for the Bombshell I have.