You most likely would be very dissappointed with the Ryobi and 1/4 Giles combo. I have tried to fly a Goldberg Sukoi with a similar setup with poor results. My advice would be to get a 149 buck 45cc homelite saw for the Great Planes Giles. I had one of these planes with a Supertigre 2300 on it and it was decent......no 3d mind you, but a good aerobat. The power to weight of the Ryobi and Homelite conversions just can't compete with the glow 2300. On the other hand, the 45cc Homelite saw engine will weigh about the same as a Homelite 25cc and have plenty of power for your Giles.

By the way, think hard about that Giles. It was not the best flying airplane for me. It kind of seemed twitchy and was a bit touchy on landings. I think there are better airframes in that same size range than the Great Planes Giles. Just my opinion.

Tom