<html>
<head>
<style>
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
FONT-SIZE: 10pt;
FONT-FAMILY:Tahoma
}
</style>
</head>
<body class='hmmessage'>
<A href="mailto:lagrue@hotmail.com">lagrue@hotmail.com</A><BR>
Jeremy Chinn...great guy!<BR>
JLK<BR><BR>> From: wgalligan@att.net<BR>> To: nsrca-discussion@lists.nsrca.org<BR>> Date: Fri, 1 Aug 2008 11:33:57 -0500<BR>> Subject: Re: [NSRCA-discussion] Heat Sinks<BR>> <BR>> Speaking of the Kudzu..... I have a set of wings and stabs from a Genesis <BR>> that need a fuse and I thought that profile platform might be a good place <BR>> to use them for knock around plane. Anyone know how to contact the builder <BR>> of that plane for some plans?<BR>> <BR>> Wayne Galligan<BR>> <BR>> ----- Original Message ----- <BR>> From: <glmiller3@suddenlink.net><BR>> To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><BR>> Sent: Friday, August 01, 2008 9:57 AM<BR>> Subject: Re: [NSRCA-discussion] Heat Sinks<BR>> <BR>> <BR>> > Fascinating stuff, Jeremy, Thanks for the reference. It looks to me (as a <BR>> > naive evaluation) that the energy cost and additional heat generated would <BR>> > be more than the potential gain for our uses-- unless they were built into <BR>> > the battery packs- but then you'd have to somehow vent the "hot side" away <BR>> > from the adjacent cell....what we really need is better airflow <BR>> > over/around our cells---like hanging them out in the air like the Kudzu- <BR>> > or putting them in an open pipe tunnel like I did on my E Focus <BR>> > conversions. All my batteries enclosed in a fuse get hotter than I'd like <BR>> > (125-135 F) though I've been told this is "optimum operating temp" anyway. <BR>> > I've played with ductwork, vents and exhaust configurations and I can't <BR>> > honestly tell much difference.<BR>> ><BR>> > G<BR>> > ---- JEREMY CHINN <lagrue@hotmail.com> wrote:<BR>> ><BR>> > =============<BR>> ><BR>> > With much the same question in mind, I found this with Google.....<BR>> ><BR>> > http://www.dansdata.com/peltprac.htm<BR>> ><BR>> >> Date: Fri, 1 Aug 2008 09:24:56 -0500> From: glmiller3@suddenlink.net> To: <BR>> >> jpavlick@idseng.com; nsrca-discussion@lists.nsrca.org> Subject: Re: <BR>> >> [NSRCA-discussion] Heat Sinks> > What the heck are Peltiers? Flying in LA <BR>> >> I never have to worry about batteries being too COOL!> > I'm always <BR>> >> looking for a way to improve heat exchange, though. > > G> ---- John <BR>> >> Pavlick <jpavlick@idseng.com> wrote: > > =============> You didn't fly <BR>> >> fast enough to heat them up! <LOL> Seriously, LiPOs perform best within a <BR>> >> certain temperature range. You electron heads should look into something <BR>> >> that can keep the batteries within this range. Maybe Peltiers? These are <BR>> >> nice because thay can generate heat OR provide a cooling effect. If <BR>> >> anyone wants to explore this I'd be glad to help.> > John Pavlick> > <BR>> >> JEREMY CHINN <lagrue@hotmail.com> wrote:> .hmmessage P { margin:0px; <BR>> >> padding:0px } body.hmmessage { FONT-SIZE: 10pt; FONT-FAMILY:Tahoma } The <BR>> >> assessment on my Kudzu at the Nats was that my batteries never ev<BR>> > en got to optimum operating temperature...... > > <BR>> > > ---------------------------------> From: jpavlick@idseng.com> To: <BR>> > nsrca-discussion@lists.nsrca.org> Date: Thu, 31 Jul 2008 22:12:06 -0400> <BR>> > Subject: Re: [NSRCA-discussion] Heat Sinks> > Sounds heavy. Don't electric <BR>> > airplanes have trouble making weight (except for Dave Lockhart's of <BR>> > course)? What are you guys doing for letting air in / out of the fuse. <BR>> > Without proper airflow, even a good heat sink won't work. Actually <BR>> > wouldn't it be better to make some kind of (light weight) thermostatically <BR>> > controlled cooling system? Cold LiPOs don't make optimum power.> > John <BR>> > Pavlick> http://www.idseng.com> ----- Original Message ----- > From: Earl <BR>> > Haury > To: Discussion List, NSRCA > Sent: Thursday, July 31, 2008 9:49 <BR>> > PM> Subject: [NSRCA-discussion] Heat Sinks> > > We all tend to mount E <BR>> > batteries on some sort of wooden / carbon / nomex shelf and tie them down <BR>> > with Velcro or a clamp plate - none of which are very good at transferring <BR>> > heat<BR>> > . Possibly we could improve heat transfer from the batts to the cooling <BR>> > air by using aluminum, or better yet - finned aluminum heatsink material <BR>> > for the shelf / clamp. > > I've spent a fair bit of time trying for find <BR>> > appropriate heatsink material online - something 4" long x 3" wide with a <BR>> > high count of thin, maybe 1/4 high, fins might work. Unfortunately, <BR>> > there's tons of heatsink material available from Newark, Mauser, etc. but <BR>> > it's difficult to find the right stuff - especially material light enough <BR>> > for our use. The closest I've come is Thermaflo # E1243, but I'm lacking a <BR>> > small quantity source. > > Anybody work with this stuff & have <BR>> > recommendations or sources?> > Earl> > ---------------------------------> <BR>> > > _______________________________________________> NSRCA-discussion <BR>> > mailing list> NSRCA-discussion@lists.nsrca.org> <BR>> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion> > <BR>> > > ---------------------------------> Use video conversation to talk <BR>> > face-to-face with Windows<BR>> > Live Messenger. Get started. <BR>> > _______________________________________________> NSRCA-discussion mailing <BR>> > list> NSRCA-discussion@lists.nsrca.org> <BR>> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion> > <BR>> > _______________________________________________> NSRCA-discussion mailing <BR>> > list> NSRCA-discussion@lists.nsrca.org> <BR>> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR>> > _________________________________________________________________<BR>> > Time for vacation? WIN what you need- enter now!<BR>> > http://www.gowindowslive.com/summergiveaway/?ocid=tag_jlyhm<BR>> > _______________________________________________<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></body>
</html>