I've read several instances of 40cc class engines hovering 14lbs.-15lbs planes with plenty of pullout power. What are you basing your statement on?
I'm not trying to be argumentative, just trying to learn.
ORIGINAL: poco242
It all depends on the engine. Most of the 30-35cc gassers like an Evolution are just as heavy as some of the 40cc's out there. I do know a 40 would do well on it. Maybe not a great 3D combo unless the weight was closer to 12lbs. If it was 12lb then a 40 would do well. It would keep it lite for sure.