Re: New Aircraft design tube fuselage with foam core wing That's not really how cooling air works. It's not about how much you get, it's about how the air is used. For max cooling you need the differential pressure, or delta P across the cylinders to be as high as possible. I've seen an engine in a fast plane toasted because a piece of baffling was either left out or fell off. Plenty of airflow, however, the air was just sailing through the cowl unrestricted. And lycoming used that little factoid, delta P <x.x to deny the warranty claim.