What's a good size and weight for a plane to work with a Cox reed valve engine (Golden Bee style)? Dick Sarpoulis published a bunch of designs in Flying Models several years back, all for TD engines, which I have found to my disappointment to be too big for the reed valve engines, at least if you want to _do_ anything. (great trainer for the kids, though).
I'm looking for something that'll do at least the round maneuvers -- loops, wingovers, inverted, 8's, etc. I vaguely recall having a plane from Sig many moons ago that would do this, but I can't remember if it was the baby Skyray or the Dewybird with it's landing gear removed. Initially I'm thinking of an all-sheet plane, although I'd like to try a built-up wing stunter as well. I'm sure one could go bigger with a built-up wing and still have a realistic chance of keeping the weight down.
Comments on tail moments and volumes are welcome, too, although I suspect that I just want to crib off of existing stunt planes for this.
I do _not_ want to go buy any new engines -- I have about a dozen Cox reed valve engines as a consequence of a comment I made when I was in my teens, to a cousin with an unexpected ability and a large and generous circle of friends. Most of them have about as much wear as you'd expect from the usual one flight on the sleazy Cox ARFs. Passing them by in favor of some new thing would be some kind of sin, I'm sure.