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With much the same question in mind, I found this with Google.....<BR>
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<A href="http://www.dansdata.com/peltprac.htm">http://www.dansdata.com/peltprac.htm</A><BR>
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<BR><BR>> Date: Fri, 1 Aug 2008 09:24:56 -0500<BR>> From: glmiller3@suddenlink.net<BR>> To: jpavlick@idseng.com; nsrca-discussion@lists.nsrca.org<BR>> Subject: Re: [NSRCA-discussion] Heat Sinks<BR>> <BR>> What the heck are Peltiers? Flying in LA I never have to worry about batteries being too COOL!<BR>> <BR>> I'm always looking for a way to improve heat exchange, though. <BR>> <BR>> G<BR>> ---- John Pavlick <jpavlick@idseng.com> wrote: <BR>> <BR>> =============<BR>> 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.<BR>> <BR>> John Pavlick<BR>> <BR>> JEREMY CHINN <lagrue@hotmail.com> wrote:<BR>> .hmmessage P { margin:0px; padding:0px } body.hmmessage { FONT-SIZE: 10pt; FONT-FAMILY:Tahoma } The assessment on my Kudzu at the Nats was that my batteries never even got to optimum operating temperature...... <BR>> <BR>> <BR>> ---------------------------------<BR>> 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>> 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.<BR>> <BR>> John Pavlick<BR>> http://www.idseng.com<BR>> ----- Original Message ----- <BR>> From: Earl Haury <BR>> To: Discussion List, NSRCA <BR>> Sent: Thursday, July 31, 2008 9:49 PM<BR>> Subject: [NSRCA-discussion] Heat Sinks<BR>> <BR>> <BR>> 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. <BR>> <BR>> 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. <BR>> <BR>> Anybody work with this stuff & have recommendations or sources?<BR>> <BR>> Earl<BR>> <BR>> ---------------------------------<BR>> <BR>> _______________________________________________<BR>> NSRCA-discussion mailing list<BR>> NSRCA-discussion@lists.nsrca.org<BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR>> <BR>> <BR>> ---------------------------------<BR>> Use video conversation to talk face-to-face with Windows Live Messenger. Get started. _______________________________________________<BR>> NSRCA-discussion mailing list<BR>> NSRCA-discussion@lists.nsrca.org<BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR>> <BR>> _______________________________________________<BR>> NSRCA-discussion mailing list<BR>> NSRCA-discussion@lists.nsrca.org<BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR><BR><br /><hr />Time for vacation? WIN what you need. <a href='http://www.gowindowslive.com/summergiveaway/?ocid=tag_jlyhm' target='_new'>Enter Now!</a></body>
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