I took a 26cc homelite engine and put a rc boat prop on it. The engine sits in the middle of the canoe and shaft runs down the middle to a tunnel haul that i fiberglassed and it goes as fast as a 40pound thrust trolling motor pushes it!! I made an exhaust for it that lets out the back under the water. Its set up so the water can't go back up the pipe and into the engine. Its a cool design. I will post some pics when i get a camera!! i call it the water bug!