Engine Selection?
 

Hello,

Anyone have experience with the following engines.

Echo 61 cc twin from chain saw.

Mac 60cc single from early craftsman chainsaw.

I have both and am trying to decide which to convert and use on a fun fly type airplane. From my web searchs, it looks like the mac will perform similar to a G62. Understand the BME 61 uses internals from echo 61. BME web site says it'll swing a 24" prop "with authority".
http://www.bmeengine.com/html/61.htm

Prop, rpm etc observations would be appreciated.

John