RE: please identify this engine
I've had no problems whatsoever with it, and it balanced with no extra tail weight needed. Of course I removed the heavy magneto ignition and used electronic ignition, which helped on the weight and balance issue. If you used a lighter engine on this plane, you would have to add ballast weight in the nose to get the c.g. right.
Additionally, I converted it to four ailerons instead of the original, (and scale), two aileron setup. Rolls and aileron response are very good now. It is the Tiger Moth sold by Nitro Planes. I don't know if they have any left. They are bailing out of gas planes on us, and investing all their money on those damn electric planes. It's a shame as I have several of their gas and/or glow airplanes and they were cheap, but well made in my opinion. The only bad part was sketchy instructions and some occasional problems with support. However, I would buy more planes from them if they would just stock them and keep the great prices.
AV8TOR