<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym18_1_1459407846850_2693"><span id="yui_3_16_0_ym18_1_1459407846850_2692">Brian, </span></div><div id="yui_3_16_0_ym18_1_1459407846850_2695" dir="ltr"><span id="yui_3_16_0_ym18_1_1459407846850_2795">that's pretty impressive. I have run a 2,200W brushless motor in fresh water</span></div><div id="yui_3_16_0_ym18_1_1459407846850_2740" dir="ltr"><span id="yui_3_16_0_ym18_1_1459407846850_2739">without any modifications, but the stator & magnets got some rust & the bearings were</span></div><div id="yui_3_16_0_ym18_1_1459407846850_2738" dir="ltr"><span id="yui_3_16_0_ym18_1_1459407846850_2741">damaged also. The windings are coated, so that's not an issue; it would just be a matter</span></div><div id="yui_3_16_0_ym18_1_1459407846850_2794" dir="ltr"><span id="yui_3_16_0_ym18_1_1459407846850_2796">of coating where they join the phase wires. Also you would need to use the right bearings & coat the metal </span><span id="yui_3_16_0_ym18_1_1459407846850_2902">parts.</span></div><div id="yui_3_16_0_ym18_1_1459407846850_2870" dir="ltr"><span id="yui_3_16_0_ym18_1_1459407846850_2869">There is a group making an underwater thruster without a housing,</span></div><div id="yui_3_16_0_ym18_1_1459407846850_2970" dir="ltr"><span id="yui_3_16_0_ym18_1_1459407846850_2969"> <a id="yui_3_16_0_ym18_1_1459407846850_2974" href="http://www.bluerobotics.com/">http://www.bluerobotics.com/</a></span></div><div id="yui_3_16_0_ym18_1_1459407846850_2979" dir="ltr"><span id="yui_3_16_0_ym18_1_1459407846850_3020">but the problem </span><span id="yui_3_16_0_ym18_1_1459407846850_2871">I see is that the propeller or forward motion will drive abrasive grit in to the motor which </span><span id="yui_3_16_0_ym18_1_1459407846850_2892">is rotating at high speeds, & will act like a sand blaster & destroy everything.</span></div><div id="yui_3_16_0_ym18_1_1459407846850_2912" dir="ltr"><span id="yui_3_16_0_ym18_1_1459407846850_2918">OK for the quad copter that only sits on the bottom most of the time.</span></div><div id="yui_3_16_0_ym18_1_1459407846850_2929" dir="ltr"><span>Cheers Alan</span></div><div id="yui_3_16_0_ym18_1_1459407846850_2873" dir="ltr"><span></span><br></div><div class="qtdSeparateBR" id="yui_3_16_0_ym18_1_1459407846850_2645"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym18_1_1459407846850_2754" style="display: block;"> <div id="yui_3_16_0_ym18_1_1459407846850_2753" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym18_1_1459407846850_2752" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym18_1_1459407846850_2751" dir="ltr"> <font id="yui_3_16_0_ym18_1_1459407846850_2750" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym18_1_1459407846850_2825"> <b><span style="font-weight: bold;">From:</span></b> Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> PSubs <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, March 31, 2016 7:14 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] ROV - underwater<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym18_1_1459407846850_2757"><br><div id="yiv9471526814"><div id="yui_3_16_0_ym18_1_1459407846850_2756" style="font-family: Arial, sans-serif; font-size: 10pt;"><div id="yui_3_16_0_ym18_1_1459407846850_2755">I'd like to know what they used to coat the motors, Epoxy material?</div><div id="yui_3_16_0_ym18_1_1459407846850_2772"> </div><div id="yui_3_16_0_ym18_1_1459407846850_2759"><a id="yui_3_16_0_ym18_1_1459407846850_2758" href="https://www.youtube.com/watch?v=Z6oLylDRRM4" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=Z6oLylDRRM4</a></div><div id="yui_3_16_0_ym18_1_1459407846850_2761"> </div><div id="yui_3_16_0_ym18_1_1459407846850_2773">Brian</div></div>
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