What Thumbskull said was my first thought too. Your engine would run cold, and not work properly. Years ago I had a Heli engine that I used in a plane, I could never get it to run right in the plane, but ran great in the heli. <div>
</div><div>Why not attach a flywheel to it instead? Use the clutch setup you normally would, and use a large balanced weight for the flywheel. Drive it with a belt.  You wont have the hazard of a prop exploding, and you can run it up to top speed. </div>