<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt"><div id="yiv5016048131"><div><div style="color: rgb(0, 0, 0); font-family: times new roman, new york, times, serif; font-size: 12pt; background-color: rgb(255, 255, 255);"><div id="yiv5016048131yui_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><div> </div><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><div> </div><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><div> </div><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><div> </div><div>Some musings.</div><div> </div><div>Joe</div>
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