rtn9105:

Like I just posted on the previous page, mine has a BCMA 26cc on it, and it flies great. It is a little heavier than some of the 4-strokes you can put on it that these folks are talking about, but I moved the battery to a tray farther back in the fuse, and it balances perfect, (a little tail-heavy is perfect for me). It has unlimited vertical and nice pull-out from a hover. I'm using a Xoar 18X6 prop, which I've found is a great 3D prop for this engine. I also used an APC 16X4W, which had it turning a little over 9000 RPM's, which was good for break-in, but once it started developing its full power I had to go bigger to keep from over-revving.

One thing to keep in mind is that the gas engines take a good 2-4 gallons of fuel for complete break-in, and after that they develop their full power potential. The nice thing about gas engine break-in is that it is done best in the air with varying throttle settings. So, you mount it and fly it. Another nice thing about gas engines is the cheap fuel. They also burn fuel about half as fast as the equivalent glow engine, so you can use a smaller tank to save weight.

Hope that helps.

-Pat