I am thinking of going w/ multi-cylinder 4-stroke glow for the sound & look. Would the OS 300 radial fit in there? It weighs almost 6 lb. The 1.60 FX it calls for, I'm not sure if the plane will end up tail-heavy with it, being a Zero. The next smaller radial would be the Saito tri 170, which won't have enough power. Anyone planning a 4-stroker?