Thanks for the link.

OK, I finally took the trouble to look up the entire Evolution line of engines and sure enough, apparently the only one of approximately my size with a flywheel is the EVOE100, a .455 size machine. Interesting. I've put 3 gallons of glow fuel through this thing not knowing what size engine I was running. [:@] Am I clueless or what? Must have been all the reviews I read prior to buying it, all of which referred to it as a .40 trainer. Particularly this one, which I think is the best known (note caption on picture, for ex.):

http://www.horizonhobby.com/Explore/...ArticleID=1229

So, I guess a good, middle of the road 2 bladed prop would be, say, a 11x6, rather than the 10x6 I was pointing at before..?

-- Mike