I have been looking at the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXEUN2&P=0]GP Super Stearman [/link] and putting a Brillelli 40cc engine on the business end. The Brillelli 40cc weighs 6oz less the the Z G26 and swings an APC 18X10 at 7700 rpm new out of the box. Physical size shouldn't be a problem as it's about the same size as my Brillelli 25cc I currently have. I'd sure like some feed back from some of you guys flying this plane with a gasser.