ORIGINAL: flygilmore
On Toni Clark's site it talks about cowl on and off.....from what I gathered, the engine should be broken in (in the air) as it shall spend its life-cowled and baffeled appropriately.
That is true with the type of high performance planes Toni runs. I would say thatmost RC flyer,s (20%) or less use baffeled system for air flow.Most use the 3 times bigger outlet for air than the intake for air for cooling. Could be wrong....it would not be the first time! Capt,n