FiberClassics Spit ... How I cool Q 100 .....


The Q 100 is cooled by ducting air from the radiators under the wings, through a duct in the fuse, and into one side of the cowl. The cowl is itself ducted to only let the incoming air go over the cylinder head. Exits out the bottom.

Custom muffler mount made so no engine parts or muffler hanging out. LOTS of work, but fun to engineer it. This slowed the build down considerably !

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. On hot days.. I just keep it wide open and moving until it's time to land.

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 whh
when I leave it on and start the engine.

Look at these pics my buddy shot last year. Look close at underside shot... you'll see the cut out on the lower cowl to let air out. You can also see the small blow in door open to let carb air in.