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Good Point, Todd.
Keeping the boundary layer out is a worthwhile
consideration, My inlet is similar to the smiley but with the opening
protruding out a bit from the cowl (hopefully past the boundary layer).
The other photo shows my first, original attempt - I'm almost embarrassed
by my then lack of even a rudimentary understanding of what it took
to cool a rotary.
Ed
----- Original Message -----
Sent: Tuesday, January 30, 2007 2:40
PM
Subject: [FlyRotary] Re: New Cowl
Contest
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.
--
,|"|"|, Ernest
Christley
|
----===<{{(oQo)}}>===---- Dyke Delta
Builder |
o| d |o http://ernest.isa-geek.org |
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