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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Yep, except that would require another
POWER to operate them!</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
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<p><b><i><font size=4 color=navy face="Brush Script MT"><span style='font-size:
13.5pt;font-family:"Brush Script MT";color:navy;font-weight:bold;font-style:
italic'>Jay Marshall</span></font></i></b><font color=navy><span
style='color:navy'> </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>John Pavlick<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, August 01, 2008 9:07
AM<br>
<b><span style='font-weight:bold'>To:</span></b> General pattern discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Heat Sinks</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>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.</span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>John Pavlick<br>
<br>
<b><i><span style='font-weight:bold;font-style:italic'>JEREMY CHINN
<lagrue@hotmail.com></span></i></b> wrote:</span></font></p>
</div>
<blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 3.0pt;
margin-left:3.0pt;margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>The
assessment on my Kudzu at the Nats was that my batteries never even got to
optimum operating temperature...... </span></font></p>
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size=3 face="Times New Roman"><span style='font-size:12.0pt'>
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<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>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</span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>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.</span></font></p>
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style='font-size:12.0pt'> </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>John Pavlick<br>
<a href="http://www.idseng.com/" target="_blank">http://www.idseng.com</a></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>----- Original Message ----- </span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='margin-left:.5in;background:#E4E4E4'><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:ejhaury@comcast.net" title="ejhaury@comcast.net">Earl Haury</a> </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">Discussion List, NSRCA</a> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Thursday,
July 31, 2008 9:49 PM</span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>
[NSRCA-discussion] Heat Sinks</span></font></p>
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style='font-size:12.0pt'> </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face=Arial><span
style='font-size:12.0pt;font-family: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. </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face=Arial><span
style='font-size:12.0pt;font-family: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. </span></font></p>
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style='font-size:12.0pt'> </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face=Arial><span
style='font-size:12.0pt;font-family:Arial'>Anybody work with this stuff &
have recommendations or sources?</span></font></p>
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style='font-size:12.0pt'> </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face=Arial><span
style='font-size:12.0pt;font-family:Arial'>Earl</span></font></p>
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size=3 face="Times New Roman"><span style='font-size:12.0pt'>
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</span></font></div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
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</blockquote>
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