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