<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt"><div><span>Jon,</span></div><div><span></span> </div><div><span>I was intigued by the condition of the motors on the K-600 after thier long entombment. </span></div><div><span></span> </div><div><span>So as a result, I'm currently studying his design as well as off-the-shelf examples while looking at ways to incorporate homebuilding with more modern materials and components.</span></div><div><span></span> </div><div><span>Joe</span></div><div style="display: block;" class="yahoo_quoted"> <br> <br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <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 Wednesday, October 9, 2013 10:59 PM, Jon Wallace <jonw@psubs.org> wrote:<br> </font> </div> <div class="y_msg_container"><div id="yiv0503545390"><div>
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Never inquired about it with George. My guess is it had as much
to do with the overall design as anything else. He used dog-ears
at the open end to hold the motor which required a certain amount
of material to support the 1/4 inch attachment bolts. I suspect
the can size was based upon convenience.<br clear="none">
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On 10/9/2013 8:48 PM, Joe Perkel wrote:<br clear="none">
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<div id="yiv0503545390yui_3_7_2_26_1381355267750_35">I am
trying to understand George's design intent reference
his 1 ATM SCH40 pipe housings and cooling.</div>
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<div>Where #8 SCH40 O.D. being 8.625" and your typical 2-3
HP DC enclosed fan cooled motor being roughly 6", was it
his intent to have this airspace between the motor and
inner wall for air circulation, or is this space simply
incidental?</div>
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<div>I am wondering if these housings can be slimmed down
to a more snug or custom fit with a reliance on
conduction for cooling? Perhaps even filling the 1 ATM
housing with non-compensated oil for the sole purpose of
efficient conduction?</div>
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<div>I am also noting that the bow thruster industry likes
to get the motor out of the props way with a 90 degree
drive arrangement. This has interesting implications
for potentially more efficient and downsized lateral
thrusters.</div>
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<div>Some musings.</div>
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<div>Joe</div>
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