<div>You didn't fly fast enough to heat them up! <LOL> Seriously, LiPOs perform best within a certain temperature range. You electron heads should look into something that can keep the batteries within this range. Maybe Peltiers? These are nice because thay can generate heat OR provide a cooling effect. If anyone wants to explore this I'd be glad to help.</div> <div> </div> <div>John Pavlick<BR><BR><B><I>JEREMY CHINN <lagrue@hotmail.com></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <STYLE> .hmmessage P { margin:0px; padding:0px } body.hmmessage { FONT-SIZE: 10pt; FONT-FAMILY:Tahoma } </STYLE> 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> <div><BR>_______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</div></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> _______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE><BR>