Dick,
My first comment was in reference to your comment

"Bottom line - the % difference in the entire"powerunit" will be quite small."

The rest of what I said must have been a brain fart. I don't know where it came from.

lgodin, If this engine turns out to be what Keith says, it could EASILY replace most of the 60cc engines and have less weight. Less weight is ALWAYS good, you just have to look at different ways to get the plane balanced. It is not impossible. Move elev servos as far forward as possible, same with the rudder servo(s).
I have had GREAT success with radio equipment within 6 inches of engine ignition, so I would NOT be the least bit afraid to shove everything that close to the ignition module. Get the ignition module up on the firewall and there you have it. If any lead has to be added, it would be kept to a minimum. I personally think this engine would be EXCELLENT on ANY 90" and below aerobatic aircraft. The new AEROWORKS 31% ARF would fly very well with this engine. If this engine turns a 24" prop like Keith told me, it should have the thrust of most of the current 70cc engines.

Jeff