You know, I've been lurking about, reading with much interest, all the info I can about conversions and homebrew fuel so that I can be more prepared when it comes time to put my Hawk together. The Ryobi's seem to be such a great choice, so I go out to my shed the other day to look at my trimmer. Lo and behold, it's a Ryobi 31cc. Now I don't know about you all, but this trimmer is the biggest piece of crap I've ever had, so I can't imagine putting it into a plane that could potentially fall from the sky.
I'll have an OS 1.20 four-stroke soon, but I'd like to save on fuel cost...so the conversions have interested me. Seems to me like the biggest concern is not necessarily the size of the engine, but the carb/muffler configuration. I'm not sure I can fit one into my plane without hacking it up. I know it's been done because of other threads, but I'm just not sure.
So what was the decision maker for you all??

Scott