I just ordered the Great Planes Giant Scale Super Chipmunk 1.20 ARF from Tower Hobbies. It's on back order until early November. I don't have any experience with gas engines, but it seemed to me that a 25cc Homelite conversion might work well in this. The Tech Notes recommend a .91-1.08 cu in (15-17.5 cc) two stroke, or a .91 -1.20 cu in (15-19.5 cc) four stroke. Seems like most of the available glow engines weigh between 31 and 35 ounces. These two conversions are between 53 and 64 ounces:

[link=http://www.firstplaceengines.com/MainFrame.html]First Place Engines[/link]

[link=http://www.gcbmrc.com/engines_25cc.htm]gcbm RC Models[/link]

How critical is the weight? I spoke with the president of GCBM and he thought this engine would work fine in the new GP Super Chipmunk. From what I've read, it seems you save just a little bit of weight by going with electronic ignition. Lighter than a magneto, but you need more battery for the eletronic module. Since I'd like to avoid spending the big bucks, it seems the price is right for the GCBM R/C 25cc at $210. What do you all think?

I also found a 25cc Homelite weed wacker in my garage that is in pretty good shape. I'll bet it has no more than 6 hours on it. Should I consider having it converted? Thanks for you help.

Marl Bell