This is the Heli engine http://www.horizonhobby.com/Products...odID=EVOE0520H . Note the MUCH larger head. It also has a different carb. Here is the manual http://www.horizonhobby.com/ProdInfo...eli_Manual.pdf which gives a closer view and a list of parts. You'll note that there is no "prop driver". This is because in a heli the shaft connects to a clutch. This is OK short term for break-in but you wouldn't want to run this way long term. Fly a plane engine in a plane.

Pass on this engine unless you see a heli in your future.