<div>Jeremy's Email (he's on "the list"): <SPAN class=yshortcuts id=lw_1217610631_2 style="BACKGROUND: none transparent scroll repeat 0% 0%; CURSOR: hand; BORDER-BOTTOM: #0066cc 1px dashed"><A href="mailto:lagrue@hotmail.com">lagrue@hotmail.com</A></SPAN></div> <div><SPAN class=yshortcuts style="BACKGROUND: none transparent scroll repeat 0% 0%; CURSOR: hand; BORDER-BOTTOM: #0066cc 1px dashed"></SPAN> </div> <div><SPAN class=yshortcuts style="BACKGROUND: none transparent scroll repeat 0% 0%; CURSOR: hand; BORDER-BOTTOM: #0066cc 1px dashed">John Pavlick</SPAN></div> <div><BR><BR><B><I>Wayne Galligan <wgalligan@att.net></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">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
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