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Btrueblood, The cooling systems that you showed me are for when the engine is in the front of the fuselage. Would this work for an engine behind the cockpit? I'm not sure where all the airflow is turbulent and what effect the prop has on the air.

Thanks a lot btrueblood. Ill try it out and keep the thread updated on progress.

Also, the propeller blades extend into the airstream automatically by centrifugal force when the engine is started

The ducts are open when ever the nosecone is extended and the propeller is being used. The cooling ducts double the drag on the Stemme when they are open. I have been tasked to find a way to reduce this drag. Any more help would be much appreciated.

Hey Guys, Im trying to reduce the cooling drag on a Stemme S10 by modifying the cooling ducts. However I am having trouble coming up with ideas. I was going to try to use a NACA duct initially but the surface of the airplane where the engine is located is at a negative slope to the airflow. If...