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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'>Earl, it has been several years since I “played”
with these devices to cool electronic components. As I remember the cooling
power is proportional to the input power. They still require a heat sink. See <a
href="http://www.overclockers.com/tips45/">http://www.overclockers.com/tips45/</a>
for some discussion on cooling CPUs.</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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>IMHO, because of the power requirements,
extra weight, and heat sink requirements they would be totally unsuitable for a
pattern plane. The idea of a real heat sink, maybe with the fins as part of the
skin of the plane and in the airstream, and the LiPo cell edges bonded to the
sink with thermal compound, has some merit and may require some investigation –
if cooling is what we really want.</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>
<div>
<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>
</div>
<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>Earl Haury<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, August 01, 2008 3:21
PM<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>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face=Arial><span
style='font-size:12.0pt;font-family:Arial'>Jay</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face=Arial><span
style='font-size:12.0pt;font-family:Arial'>Is it possible to change the
"set point" of these units by varying the input voltage?</span></font></p>
</div>
<div>
<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=Arial><span
style='font-size:12.0pt;font-family:Arial'>Earl</span></font></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 3.0pt;
margin-left:3.0pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
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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:lightfoot@sc.rr.com" title="lightfoot@sc.rr.com">Jay Marshall</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'>To:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:jpavlick@idseng.com" title="jpavlick@idseng.com">jpavlick@idseng.com</a>
; <a href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">'General pattern discussion'</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'> Friday,
August 01, 2008 2:04 PM</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'>Subject:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Re:
[NSRCA-discussion] Heat Sinks</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Peltiers are the units used in your car to provide a
hot/cold portable food container.</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>
<div>
<p style='margin-left:.5in'><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>
</div>
<p class=MsoNormal style='margin-left:1.0in'><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> <a
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</a>
[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
11:44 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <a
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Heat Sinks</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Yup that's one application though not the most
effective use. You wouldn't want to dissipate a lot of energy like what
this guy was trying to do. The neat thing about Peltiers is they can heat and
cool depending on which direction the current flows. In other words, they can
be used to control the temperature (up or down) and they're solid state so
there are no moving parts. </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Of course they require power to operate and it
probably wouldn't be practical to use the batteries themselves as the source
since you guys need every last drop of energy in them to run the motor. </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Just something to think about. Kinda like a profile
Pattern plane. LOL</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>John Pavlick</span></font></p>
</div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
<br>
<b><i><span style='font-weight:bold;font-style:italic'>JEREMY CHINN
<lagrue@hotmail.com></span></i></b> wrote: </span></font></p>
<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
1.0in'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>With
much the same question in mind, I found this with Google.....<br>
<br>
<a href="http://www.dansdata.com/peltprac.htm">http://www.dansdata.com/peltprac.htm</a><br>
<br>
<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>
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> <br>
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<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Time for vacation? WIN what you need. <a
href="http://www.gowindowslive.com/summergiveaway/?ocid=tag_jlyhm" target="_new">Enter
Now!</a> </span></font></p>
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