I have a 80" span Cap 232, I would like to go gas but I'm not sure what size engine I would need. I was thinking a 40cc Chainsaw engine but thats just a shot in the dark.

Thanks in advance

40cc would fly the plane but depending on your needs you may want 45 to 50cc.

So it wouldn't be enough for 3D?

Maybe but depends on weight etc. I would look for something bigger. Had a Poulan 42cc I converted that did fine in a 14 pound plane. Not a rocket but it worked. Echo, Stihl, Husky etc are preferred for their power.

Did you use a cdi or run a glow plug? the engine I have is a Poulan 40cc

I run all my conversion engines on CH ignitions except a twin Echo I did that has a Falkon module.

Thanks for the help, I think I will give the 40cc a try on a gas/glow setup and see where i'm at for thrust and speed and then go from there.

Tim, which echo was that and how did it work out? Got any numbers to share?

Chad

Chad, that engine is an Echo 61cc CS-610 chainsaw that was made in the early 80's for about 4 years. I have had and converted many of them and they are all strong as you would expect from Echo saws. They were on the heavy side for a saw but the torque was incredible. I just sold a running saw I had used for a few years now so I can say that they were powerful in that application. They are very hard if not impossible to find anymore. I have my prototype still ready to run and a couple of bare crankcases left that I never converted. I ran my prototype with a 22/8 prop but it would easily turn a larger prop. Here are pictures before and after the conversion process.

Tim