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Date: Mon, 23 Jul 2007 09:13:58 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Oil cooler inlet
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Al Gietzen wrote:
>
> Well; I may end up with VGs and change in upper duct wall shape. My 
> intention yesterday was to install VGs as a first step, test fly, 
> measure pressure and temps; then proceed with installing sheet metal 
> upper duct wall change.
>

I think I may be late for the party, but sometimes good ideas take 
really long to germinate.

Maybe the hole you have at the top of your cooler, caused by settling, 
is a blessing in disguise.  You can possibly use it to pass the worst of 
the boundary layer air through the duct.  Use an aluminum sheet, .040 
thick should work, and bend a lip on it.  Have it come out in front of 
the scoop to catch the boundary layer and pass it around the cooler 
(yes, just like Mr. Lamar himself suggested).  A few threaded standoffs 
at the front of the sheet would give you nicely even, and quite possibly 
attractive spacing. 

You would want to make sure that the top of the lip gets pressed down 
and seals to the top of the core.  Tape on a few wedges of 1/2" blue 
foam and see if it works.  If it does, wait for everything to cool off 
then pull the aluminum out and the foam will be compressed to the proper 
shape.  Remove the tape and glass the foam  down.