<br><font size=2 face="sans-serif">Anthony</font>
<br>
<br><font size=2 face="sans-serif">My new plane is 99.5% complete-all I
have to do is balance and align the wings-and then "re-learn"
to fly. My kid just completed the massive soccer "qualifying"
tournament-6 games, two weekends, nothing below 103F, so I am conditioned
to start flying again. <br>
</font>
<br><font size=2 face="sans-serif"><br>
<br>
<br>
Gray Fowler<br>
Senior Principal Chemical Engineer<br>
Radomes and Specialty Apertures<br>
Technical Staff Composites Engineering<br>
Raytheon</font>
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<br>
<br>
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<td width=40%><font size=1 face="sans-serif"><b>Anthony Romano <anthonyr105@hotmail.com></b>
</font>
<br><font size=1 face="sans-serif">Sent by: nsrca-discussion-bounces@lists.nsrca.org</font>
<p><font size=1 face="sans-serif">08/04/2008 09:17 AM</font>
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<div align=center><font size=1 face="sans-serif">Please respond to<br>
General pattern discussion <nsrca-discussion@lists.nsrca.org></font></div></table>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">General pattern discussion <nsrca-discussion@lists.nsrca.org></font>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [NSRCA-discussion] Heat Sinks</font></table>
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<br><font size=2 face="Tahoma">Hi Gray,<br>
Glad to see you still lurking.<br>
First, saw that technique to cool the batteries on the moon rover.<br>
<br>
Anthony<br>
<br>
<br>
<br>
<br>
</font>
<hr><font size=2 face="Tahoma"><br>
To: nsrca-discussion@lists.nsrca.org<br>
From: gfowler@raytheon.com<br>
Date: Mon, 4 Aug 2008 08:51:48 -0500<br>
Subject: Re: [NSRCA-discussion] Heat Sinks<br>
<br>
</font><font size=2 face="sans-serif"><br>
Guys</font><font size=2 face="Tahoma"> <br>
</font><font size=2 face="sans-serif"><br>
Considering that I do not fly E, this may not work, but here is a trick
from the missile world where the electronics generate massive heat in a
small package (no air cooling at mach 3!!) that must be dissapated.</font><font size=2 face="Tahoma">
<br>
</font><font size=2 face="sans-serif"><br>
Heat sinks work well but rely on intimate contact with the heat source,
which can be the actual problem-how to get the battery heat into the sink
with the odd shape of the battery packs and the flatness of the aluminum.
Since you guys know the operating temperature of the dischaging batteries,
choose a wax that melts just below your target temperature. Cast the wax
around the battery pack (you need a container or tub-super thin aluminum).
Then have the cooling fins-heat sink on top. When the batteries heat up
the wax will melt. This phase change will cool the batteries-then the viscous
liquid wax will also efficiently transfer the heat to the aluminum tub
and the aluminum heat sink. The heat sink will cool the wax which then
cool the batteries.</font><font size=2 face="Tahoma"> <br>
</font><font size=2 face="sans-serif"><br>
After recharging, the batteries cool, the wax resolidifies and it is ready
to go all over again. Wax is light weight, the aluminum tub-heatsink would
need to be custom fabbed and very thin-and basically sealed. Wax
can be easily cleaned from the batteries if needed.</font><font size=2 face="Tahoma">
<br>
</font><font size=2 face="sans-serif"><br>
Just a thought</font><font size=2 face="Tahoma"><br>
</font><font size=2 face="sans-serif"><br>
<br>
<br>
<br>
Gray Fowler<br>
Senior Principal Chemical Engineer<br>
Radomes and Specialty Apertures<br>
Technical Staff Composites Engineering<br>
Raytheon</font><font size=2 face="Tahoma"> <br>
<br>
<br>
</font>
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<td width=43%><font size=1 face="sans-serif"><b>"Earl Haury"
<ejhaury@comcast.net></b> <br>
Sent by: nsrca-discussion-bounces@lists.nsrca.org</font><font size=3 face="Tahoma">
</font><font size=1 face="sans-serif">08/01/2008 04:15 PM</font><font size=3 face="Tahoma">
</font>
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<div align=center><font size=1 face="sans-serif">Please respond to<br>
General pattern discussion <nsrca-discussion@lists.nsrca.org></font></div></table>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td width=91%><font size=1 face="sans-serif"><bob@toprudder.com>,
"General pattern discussion" <nsrca-discussion@lists.nsrca.org></font><font size=3 face="Tahoma">
</font>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [NSRCA-discussion] Heat Sinks</font></table>
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Bob</font><font size=2 face="Tahoma"> </font><font size=3 face="Tahoma"><br>
</font><font size=2 face="Tahoma"> </font><font size=3 face="Arial"><br>
My thought is that packs setting on something thermally conductive rather
than insulating seems better. Love your CO2 cartridge idea - wonder if
AMA would consider that a "gaseous boost".</font><font size=2 face="Tahoma">
</font><font size=3 face="Tahoma"><br>
</font><font size=2 face="Tahoma"> </font><font size=3 face="Arial"><br>
Earl</font><font size=3 face="Tahoma"> <br>
----- Original Message ----- <b><br>
From:</b> </font><a href=mailto:bob@toprudder.com><font size=3 color=blue face="Tahoma"><u>Bob
Richards</u></font></a><font size=3 face="Tahoma"> <b><br>
To:</b> </font><a href="mailto:nsrca-discussion@lists.nsrca.org"><font size=3 color=blue face="Tahoma"><u>General
pattern discussion</u></font></a><font size=3 face="Tahoma"> <b><br>
Sent:</b> Friday, August 01, 2008 3:47 PM</font><font size=2 face="Tahoma">
</font><font size=3 face="Tahoma"><b><br>
Subject:</b> Re: [NSRCA-discussion] Heat Sinks</font><font size=2 face="Tahoma">
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<td><font size=3 face="Tahoma">I've been thinking about this, and I think
the best way would be sandwich thin pieces of aluminum between the cells
and extend past the edge of the pack. But I'm not sure I like the idea
of placing anything electrically conductive between the cells. Best to
provide an air space between the cells and duct the cooling air between
them. <br>
<br>
Of course, if you really want some wow-factor in the setup, you would have
a thermostatically controlled cowl flap that only opens up once the pack
starts to go beyond the optimum temperature. Maybe even an emergency cooling
system - a small CO2 cartridge from an air rifle might do. ;-)<br>
<br>
Bob R<br>
<br>
--- On <b>Fri, 8/1/08, Jay Marshall <i><lightfoot@sc.rr.com></i></b>
wrote: </font><font size=2 color=#000080 face="Arial"><br>
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.</font><font size=3 face="Tahoma">
</font>
<br><font size=3 face="Times New Roman"> </font><font size=3 face="Tahoma">
</font>
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