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</font></div><div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">Jon /Sean / Jim,</font><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></div><div><font size="3" face="Times New Roman">
</font></div><div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">If I can simplify the motor cooling with ambient water, all
the better, I prefer the simplicity of that method. But, I must, must, have air-conditioning!
I must reduce cabin humidity and temperature to comfortable levels, this is a
manned steel drum in the tropical sun! Plus, I want my electronics dry.</font><o:p></o:p></div><div><font size="3" face="Times New Roman">
</font></div><div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">My intent is to isolate the machine space with a thermal
bulkhead with the required lines and piping routed through as appropriate. That
machine space then force ventilated to the outside in the sail for extended
surface transits. I was figuring that since I’m doing all this ventilating
anyway that I would feed these outside motor pods into this environment. But I
do like the idea of keeping down the number of thru hulls if I don’t need them
and just use the passing water.</font><o:p></o:p></div><div><font size="3" face="Times New Roman">
</font></div><div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">That bulkhead need not be neither structural nor watertight,
simply a thermal barrier with manhole access to the goodies beyond. The space
can be monitored with sensors and video and a fire suppression system could be
discharged without impacting the occupants???</font><o:p></o:p></div><div><font size="3" face="Times New Roman">
</font></div><div style="margin: 0in 0in 10pt;"><o:p><font size="3" face="Calibri"> </font></o:p></div><div><font size="3" face="Times New Roman">
</font></div><div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">Joe</font><o:p></o:p></div><div><font size="3" face="Times New Roman">
</font></div><div style="display: block;" class="yahoo_quoted"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 14pt;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div dir="ltr"> <font size="2" face="Arial"> On Sunday, April 13, 2014 10:11 PM, Jon Wallace <jonw@psubs.org> wrote:<br> </font> </div> <div class="y_msg_container"><div id="yiv1355840777"><div>
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A good part of the year in your climate the outside air is likely
to be hotter than the sea. I'm not convinced there's a clear
benefit outweighing the sea as a heat sink.<br clear="none">
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On 4/13/2014 8:45 PM, Joe Perkel wrote:<br clear="none">
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<div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">I
am considering a scheme for dealing with electric motor
cooling and would like input on the viability of the idea
and any pros or cons
that I may be missing.</font></div>
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</font></div>
<div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">In
looking at my SeeHund replica, note that the
torpedo/pod(s) length exceed needed battery capacity. <span> </span>So the idea being that
the aft ends of both
will house electric motors that are isolated from the
battery compartments.</font></div>
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</font></div>
<div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">I’m
thinking to ventilate these aft motor units into the aft
machinery space within the main hull. Incidentally, the hull
diameter will be
42” and the torpedoes #14 pipe. This will leave a
significant airspace around
these motor units allowing me to use fan cooled motor cases.<span> </span>Each motor pod could
be connected with vent
pipes for intake and output airflow, then the machinery
space itself force
vented to the outside with <span> </span>main
induction
and exhaust vents. <span> </span>All
this
for continuous surface running of course. Submerged, the
motor units would be
intermittent duty.</font></div>
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</font></div>
<div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">The
centerline unit would be fully enclosed and not vented,
therefore not as attractive for continuous duty due to
thermal constraints.</font></div>
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<div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri"> </font></div>
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<div style="margin: 0in 0in 10pt;"><font size="3" face="Calibri">Joe</font></div>
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