If you want it to really perform don't use a gasser. That 11lbs might turn into 13lbs with a gasser and that just increases the wing loading and decreases it's performance.

I'm not saying you can't put a gasser on it but if you do I don't think you'll be as happy as you might be with a large glow engine. Hell an OS160 would over power the hell out of it and still be in the 11lbs range.