<html>
<head>
<style>
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
FONT-SIZE: 10pt;
FONT-FAMILY:Tahoma
}
</style>
</head>
<body class='hmmessage'>
The assessment on my Kudzu at the Nats was that my batteries never even got to optimum operating temperature...... <BR><BR>
<HR>
From: jpavlick@idseng.com<BR>To: nsrca-discussion@lists.nsrca.org<BR>Date: Thu, 31 Jul 2008 22:12:06 -0400<BR>Subject: Re: [NSRCA-discussion] Heat Sinks<BR><BR>
<META content="Microsoft SafeHTML" name=Generator>
<STYLE>
</STYLE>
<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>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; font-color: black"><B>From:</B> <A title=ejhaury@comcast.net href="mailto:ejhaury@comcast.net">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">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>
<HR>
<P><BR>_______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE><br /><hr />Use video conversation to talk face-to-face with Windows Live Messenger. <a href='http://www.windowslive.com/messenger/connect_your_way.html?ocid=TXT_TAGLM_WL_Refresh_messenger_video_072008' target='_new'>Get started.</a></body>
</html>