Originally posted by rightflyer
What type of air exit holes do you have? The air must flow thru freely
The UCD 46 has a built in air-out channle on the bottom of the fuse just behind the cowl. Some people think it is a place for the muffler to sit if you side-mount the engine. It is more than adequate for allowing air to flow over the engine while in forward flight. However, in a prop hang, torque roll, harrier, elevator ... any slow-to-no-forward-flight maneuver ... overheating is an issue.
Rick