Here's something to think about. A fellow told me its a better idea to run APC's on glow engines and wood on 4-strokers. Reason being, there's less chance of causing internal component damage on a 4-stroke if the prop used is a woody should the plane auger in or nose-over. 2-strokers have less critical sensitive parts and usually can handle a high-RPM prop strike most of the time. For what its worth.