Unless you are considering the RCS 1.4 or MVVS 1.6 I would advise against using a gas engine on this size plane. It tends to push the wingloading way up. Also you would be suprised how much of that glow goo doesn't get on the plane with a proper pitts muffler. I can clean my Edge with one papertowel. The OS 1.60 will pull this plane like a rocket on 5% glowfuel.