I've been considering going with the RCS 140 for a while now, i've found several threads saying they power the topflite birds perfectly, and I'm getting sick of glow fuel mess and price (and i've only been doing this a year) but the initial price of the engine is a bit of a drawback, untill I looked up the price of a saito 120, wow 350, same as the RCS, the Super custom is a better price at about $250 but then you have the whole "made in china" debate, i know, i have an SC 60 now, it runs great......

then someone was kind enough to supply this link in another thread

http://www.carrprecision.com/Pages/prod02.htm

that little weedeater engine looks perfect, maybe the next size up. i'll get her all together, weight the front end for the right balance, and go with the biggest engine with the right weight!

all of them swing an 18" prop, with some motorhead tinkering i'm sure i can get them up to a scale 20" :devious: