Thanks guys for the suggestions. I'd really like to use a gas engine though. I've been reading through these threads and am contemplating the Honda 4-stroke engines. I saw a great looking conversion here of the 25cc Honda 4 stroke. Since it is a Cub and has a 105" wing span, I'm sure I can get away with the slightly heavier weight of the Honda, but would it be to large physically to fit in the Cub?

I watched the Honda 4-stroke video on Carr Precisions site and I think I'm hooked! It was extremely quiet running and sounded great, much nicer sounding than the normal 2 stroke gassers.

Any other opinions?

-- Acer
http://speedwing.net