Engine Sizing
 

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

RE: Engine Sizing
 

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

RE: Engine Sizing
 

So it wouldn't be enough for 3D?

RE: Engine Sizing
 

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.

RE: Engine Sizing
 

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

RE: Engine Sizing
 

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

RE: Engine Sizing
 

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.

RE: Engine Sizing
 

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

Chad

RE: Engine Sizing
 

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