I would think as long as it balanced out ok, nothing says you have to fly it at full throttle. I had a .72 Irvine on a Hobbistar .60 and an Irvine .61 on both an Avistar .40 and a Superstar .40. As long as you don't pour the coals to it during hard turns and dives I would think it should be fine. Also beware of flutter during any high speed passes.

Then again, I did pour the coals to it in a dive and flew the elevator off of my Hobbistar... Re-Kit! [:@]

I know many Rc'ers hate em, but there is also a million SPAD planes you can build for under $20 with that engine. Take a look here [link=http://www.spadtothebone.com/]Spad Planes[/link]




Just a thought... Maybe not a good one, but a thought none the less and that means progress!
Rik