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<DIV><FONT face=Arial size=2>THANKS........</FONT></DIV>
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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=jpavlick@idseng.com href="mailto:jpavlick@idseng.com">John
Pavlick</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">General pattern discussion</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, August 01, 2008 12:11
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Heat
Sinks</DIV>
<DIV><BR></DIV>
<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 <<A
href="mailto:wgalligan@att.net">wgalligan@att.net</A>></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>> >
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