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Date: Sun, 26 May 2013 20:42:44 -0500
From: Charlie England <ceengland7@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: oil cooler mount question
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I guess it does look a bit strange. It's still early in the design/fab 
process. Tentative plan is to re-shape that flange so it somewhat mimics 
a K&W 'streamline" diffuser curve, then transition to the round James 
cowl inlet. It may yet get cut off & replaced with fiberglass. The other 
side will stay flat & form a divider between the oil cooler air & the 
air feeding the throttle body (not yet mounted) that will face forward, 
just outside the outboard side of the oil cooler. The cooler is so far 
off-center from the inlet centerline that there will likely be a 
steering vane in there, too. I spent a lot of time trying to find a 
cooler that is better suited for a/c use (smaller H/W, thicker core) but 
I just didn't have any luck. I suppose that the upside is, airflow per 
sq in of face should be similar to the rad, which is about the same 
thickness & fin density. I hope to manage exit ducts on both so I can 
independently control airflow through each, but I may run out of energy 
& patience before that happens.

Charlie


On 05/26/2013 07:57 PM, Gordon Alling wrote:
> Charlie,
>
> Do I understand the photo shows a baffle between the cowl air inlet and the
> oil cooler face?  If that is correct, is it intended to distribute the inlet
> air across the face of the heat exchanger?  Does it work?  Have you measured
> temps across the face of the HX?
>
> My intuition says that that baffle will shield a large portion of the HX
> face and reduce the effectiveness.  But my intuition is notoriously bad
> (that's why I haven't made gobs of money on the stock market).  Let us know
> how effective the heat transfer is.
>
> Gordon C. Alling, Jr., PE
> President
> acumen Engineering/Analysis, Inc.
>
> 540-786-2200
> www.acumen-ea.com
>
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> Behalf Of Charlie England
> Sent: Sunday, May 26, 2013 1:13 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] oil cooler mount question
>
> I've started design/fabrication/redesign of my oil cooler mount/diffuser.
> Just as I had a 'final' answer on the mount & was contemplating the
> diffuser, it occurred to me that I didn't have any shock mount provisions
> for the heat exchanger. For those who have been flying for a while, have any
> of you hard mounted the cooler to its support structure? As the photo shows,
> the primary mount is direct to the reduction drive plate. I would simply add
> the shock mounts, but if I use this particular cooler (a CX Racing 30 row
> unit like the one on Tracy's 20B), I won't have any room. I do have the
> option of buying a 25 row or using the 19 row I already have on hand, but
> I'd rather have a bit too much capacity & throttle the exit air than start
> with too little & have to rebuild everything.
>
> Thanks,
>
> Charlie
>
>
>
>
> --
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