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<DIV><FONT face=Arial>Jay</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Is it possible to change the "set point" of these units by
varying the input voltage?</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Earl</FONT></DIV>
<BLOCKQUOTE
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=lightfoot@sc.rr.com href="mailto:lightfoot@sc.rr.com">Jay
Marshall</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=jpavlick@idseng.com
href="mailto:jpavlick@idseng.com">jpavlick@idseng.com</A> ; <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 2:04
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Heat
Sinks</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Peltiers are the units used in your car to provide a
hot/cold portable food container.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<DIV>
<P><B><I><FONT face="Brush Script MT" color=navy size=4><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 13.5pt; COLOR: navy; FONT-STYLE: italic; FONT-FAMILY: 'Brush Script MT'">Jay
Marshall</SPAN></FONT></I></B><FONT color=navy><SPAN style="COLOR: navy">
</SPAN></FONT></P></DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; 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> </SPAN></FONT><FONT face=Tahoma
size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Friday, August 01,
2008</SPAN></FONT><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN></FONT><FONT face=Tahoma
size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">11:44
AM</SPAN></FONT><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><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: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">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: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">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: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">Just something to think about. Kinda like
a profile Pattern plane. LOL</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">John Pavlick</SPAN></FONT></P></DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"><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-BOTTOM: 12pt; MARGIN-LEFT: 0.5in; MARGIN-RIGHT: 0in"><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">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: </SPAN></FONT>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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