Mailing List flyrotary@lancaironline.net Message #33701
From: Russell Duffy <rusty@radrotary.com>
Subject: RE: [FlyRotary] Re: finned aluminum sheets?
Date: Wed, 20 Sep 2006 21:03:44 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
Thanks for all the links, comments, etc.  I'll have to look through these more when I get time, but a few general comments:
 
The pre-made finned aluminum heat sinks do appear to be heavy.  I'm afraid the weight of the pan will exceed the weight of an oil cooler, but if you could eliminate the oil cooler, then it would possibly save some ducting and mounting work.  
 
I like the neat pan that Paul Conner had, but wonder about the weight vs performance. I do think that fins will need to be inside and out, which just makes the weight that much worse.  On the other hand, you could use .063 material for the actual pan, then weld even thinner fins on it.  It would be pretty labor intensive, but at least my welds wouldn't have to hold oil.  When it comes to AL welding, I still suck.  
 
The corrugated heat sink was neat, and I had already tried to figure out a way to make that work.  I do have some of the miracle brazing compound that Ed found, and that would be perfect for joining the folded heat sink to the inside and out of the pan.  This may actually be the leading candidate at the moment. 
 
Finally, the tubes through the pan idea is something I had also thought about, but... (see previous welding comment).  I wouldn't personally consider doing it in epoxy, but it would be less likely to leak :-)
 
Thanks again,
Rusty (my beer's empty)
 
 
  
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