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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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