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Date: Wed, 18 Jul 2007 15:46:09 -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:
> My concern about the diverter as you have it shown is that it is trying to
> compress the air and speed it up.  It seems to me that any convergence there
> would choke the flow of the already low energy air - you think?
>
>   
Yes.  But that is the only way you're going to speed up the air in that 
portion of the duct.  Note that you're using energy to speed it up.  
That energy is drawn from the available dynamic pressure, and it is 
being robbed from the energy that was going to the lower portion of the 
cooler.  You're making the bottom of the cooler a little "less 
effective" in order to raise the top part up from "completely useless".
> I was thinking of making the vanes with fiberglass; and glassing them in.
> But you're right; an adjustable vane would be the way to go, but it does
> complicate life.  Without taking the wing off and removing the cooler, I
> have to work in through the scoop opening.  The scoop has two vertical
> divider/supports meaning I need three separate vanes.  I'll figure out a way
> to attach to those.
>   
I would start by just working with the center portion.  Grab the low 
hanging fruit.  You may be full before its all gone.

Working from the pictures you've posted, the way I'd go about it is to 
use the 90-degree drill attachment I bought at Harbor Freight to put 
four 3/16" holes in the two vertical dividers.  Bend a length of 
aluminum to loosely fit, slide it in to one extreme position and mark 
the holes.  Move it to the other extreme and mark the holes again.  Use 
a drill-saw (drill bit with saw-like teeth) to cut slots connecting the 
four sets of two holes.  Chuck a socket adapter into the 90-degree drill 
fitting, since getting something in there to turn a nut will be tricky 
in that narrow of an opening.

If it doesn't work, remove the aluminum and you have four 3/16" holes to 
fill, sand and paint.  If it does work, remove the wing at your leisure.