Sean..

The Q 100 is cooled by ducting air from the radiators under the wings into one side of the cowl. The cowl is itself ducted to only let the incoming air go over the cylinder head.

So, air goes through the fins and out the bottom. 1/2 of the chin scoop also feeds air into the "cool" side of the cowl. Worked OK, but engine would load up after 5 minutes in the air. Seems the air in the cowl got too hot and made the carb go rich.

I added a small hinged "blow in" door on the very front of the cowl to let air directly in by the carb. That fixed the problem! Runs great now.

To help keep the engine a bit cooler I run a 24 x 10 3 blade prop. Keeps the RPM down a bit and flies the plane great. An added bonus is the 3 blade looks cool too... and pilots are always surprised whhen I leave it on and start the engine.