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Posted for Walter Atkinson <walter@advancedpilot.com>:
Gary:
You are right. It is important to remember that the majority of the air
going INTO most cowls goes right back out of the FRONT of the cowl, toward
the prop! Kinda puts "leaks" in perspective, doesn't it ! ? ! <g>
Cooling effectiveness is enhanced by WHERE the air goes. Cooling drag is
affected, among other things, by how much of the air moves freely through
the system and out along the path we want it to take going out!
In a perfect cowl, I'd like no more air coming in than I need for cooling
and have it all go exactly where I want it to go and OUT where I want it to
go out.
That sure is easy to say but difficult to accomplish.
Walter
I believe being able to maintain maximum
pressure above the engine will allow a higher pressure below the engine and
hence more velocity recovery. The balance between the two is all about
compromise. I agree that if other things are done well a significant leak
won't effect cooling effectiveness, but it must have an effect on cooling
drag as "wasted" air is going through the engine compartment instead of
around it. Again, excellent comments.
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