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I was thinking that the "oh cowl" would be better at excluding the boundary layer, which would be better for cooling. This is just based on comments I've read on the list during previous ducting discussions. Based on this info, I felt my oil cooler duct was less than optimal (even though temps are good), so I figured I could reduce the size of my inlet if I eliminated the boundary air layer. As your "smile" duct is similar (see attached pic) I figured this would be applicable. I hope I'm wrong and you prove it before I change my cowl.
Todd (building Electric Bob's Audio Isolator Amplifier today)
On 1/30/07, Ernest Christley <echristley@nc.rr.com
> wrote:David Leonard wrote:
> I call them the "Oh Cowl" and the "Smiley Cowl..."his
Go with the smile, but put a raised ledge on the cowl side just behind
the spinner to accelerate the air and thin the boundary layer. Reduces
the ingestion of turbulent air. Check the CAFE Foundation's drag
reduction report. They have a picture of what it looks like on a
production aircraft. I have a link to it at home, but not here.
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,|"|"|, Ernest Christley |
----===<{{(oQo)}}>===---- Dyke Delta Builder |
o| d |o http://ernest.isa-geek.org |
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