<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Interesting idea Earl. My batts don't usually get hot enough to need them. But good idea. </DIV>
<DIV>IA possible answer for now though, is to baffle with foam to about 1/2" or so around the battery which I'm sure you already know anyway.. It's the best we can do till they start putting a spacer between each cell and allow airflow into the packs. Which I've seen in some smaller packs. I don't like the fact that in a 5 cell pack, the outside 2 cells heat up less than the inner 3. I'm almost positive this has some affect on the inner cells life span vs the outers. </DIV>
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<DIV>Nice meeting you at the nats!!!<BR><BR></DIV>
<DIV><STRONG><EM><FONT face="comic sans ms" color=#0000bf size=3>Chris </FONT></EM></STRONG></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV><BR><BR>--- On <B>Thu, 7/31/08, John Pavlick <I><jpavlick@idseng.com></I></B> wrote:<BR>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid">From: John Pavlick <jpavlick@idseng.com><BR>Subject: Re: [NSRCA-discussion] Heat Sinks<BR>To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><BR>Date: Thursday, July 31, 2008, 7:12 PM<BR><BR>
<DIV id=yiv351822832>
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<DIV><FONT face=Arial size=2>Sounds heavy. Don't electric airplanes have trouble making weight (except for Dave Lockhart's of course)? What are you guys doing for letting air in / out of the fuse. Without proper airflow, even a good heat sink won't work. Actually wouldn't it be better to make some kind of (light weight) thermostatically controlled cooling system? Cold LiPOs don't make optimum power.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>John Pavlick<BR><A href="http://www.idseng.com/" target=_blank rel=nofollow>http://www.idseng.com</A></FONT></DIV>
<BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial"><B>From:</B> <A title=ejhaury@comcast.net href="mailto:ejhaury@comcast.net" target=_blank rel=nofollow>Earl Haury</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=nsrca-discussion@lists.nsrca.org href="mailto:nsrca-discussion@lists.nsrca.org" target=_blank rel=nofollow>Discussion List, NSRCA</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, July 31, 2008 9:49 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] Heat Sinks</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial>We all tend to mount E batteries on some sort of wooden / carbon / nomex shelf and tie them down with Velcro or a clamp plate - none of which are very good at transferring heat. Possibly we could improve heat transfer from the batts to the cooling air by using aluminum, or better yet - finned aluminum heatsink material for the shelf / clamp. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I've spent a fair bit of time trying for find appropriate heatsink material online - something 4" long x 3" wide with a high count of thin, maybe 1/4 high, fins might work. Unfortunately, there's tons of heatsink material available from Newark, Mauser, etc. but it's difficult to find the right stuff - especially material light enough for our use. The closest I've come is Thermaflo # E1243, but I'm lacking a small quantity source. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Anybody work with this stuff & have recommendations or sources?</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Earl</FONT></DIV>
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