mnrcaerobat - My first was powered by a Fox .45 BB Schneurle (70's vintage). It was good power for the model and it balanced well. I sold it to a guy who put a .60 in it and hot-dogged it all over and eventually into a tree. That model was silked and doped and believe me I cried when he did that.

The next one I can't recall what was in it. My current model has a Fox .61 Eagle III. I don't know if I'll keep that engine in it though. It was brand new when I stuck it in the ground about 15 years ago and haven't run it since. I replaced the needle valve and put it on the stand. Seemed ok, but who knows.

I think a perfect engine for the mini would be the O.S. .52 or .72 4S. I think it will like the larger prop better than a high-rev 2S. Personally I like to fly large, smooth maneuvers. I'm not a throw it all over the sky kind of pilot. But my flying style shouldn't be taken into consideration because I'm not much of a pilot. I'm a way better builder than I'll ever be a pilot.

Best of luck with yours.

BTW.... it's a "flat bottom" wing, but the flat part isn't horizontal to the thrust line. That would actually be positive incidence. Make sure you measure to the center of the LE and TE to get it at 0.