Echo 23.6cc stroked to 25cc. No tuned pipe, but ported, deck height set, large carb, free breathing exhaust, etc. Turns an APC 16 X 8 at 9400 rpms.

Lots of info in the "don't forget the echo" thread.

Anyway, that flies the CMP 72" Katana very well indeed. I don't fly 3D, but it does wonderful IMAC and sport flying. For 3D I would set the engine up for lower rpms and larger props.

Note that I can't sell an identical engine to this one I am describing, because there's just too many hours work in making it to be worthwhile for me. But the 24cc on my Fokker has nothing more than a larger carb and a free breathing muffler and it has plenty of power. Turns a big old wood Top Flite 18 x 6 prop at about 7600 or so, and that pulls that Fokker through huge loops, Immelman turns, nice steep climbs, etc. Remember too that Gas/Glow itself adds a couple hundred or so rpms in power as well.

AV8TOR