<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_1459471359731_2550"><span>Yes, all oil compensated.</span></div><div id="yui_3_16_0_ym18_1_1459471359731_2549"><span id="yui_3_16_0_ym18_1_1459471359731_2548">It will help transfer the heat off the coils.</span></div><div id="yui_3_16_0_ym18_1_1459471359731_2604" dir="ltr"><span id="yui_3_16_0_ym18_1_1459471359731_2603">I haven't finalized the oil & viscosity. I will run it out of the water with no load</span></div><div id="yui_3_16_0_ym18_1_1459471359731_2616" dir="ltr"><span id="yui_3_16_0_ym18_1_1459471359731_2615">& see what amps it draws & compare that with differing viscosities of oil.</span></div><div dir="ltr"><span>I know I have seen figures on this site of 3 cst used in compensating oil, but</span></div><div id="yui_3_16_0_ym18_1_1459471359731_2669" dir="ltr"><span id="yui_3_16_0_ym18_1_1459471359731_2668">documents I have read on oil compensated water pumps had 20 cst. Also</span></div><div id="yui_3_16_0_ym18_1_1459471359731_2671" dir="ltr"><span id="yui_3_16_0_ym18_1_1459471359731_2670">on talking to the bearing engineer, he had concerns that the bearings would </span></div><div id="yui_3_16_0_ym18_1_1459471359731_2674" dir="ltr"><span id="yui_3_16_0_ym18_1_1459471359731_2673">not float on a low viscosity oil & wear out quickly with metal to metal contact.</span></div><div id="yui_3_16_0_ym18_1_1459471359731_2672"><span id="yui_3_16_0_ym18_1_1459471359731_2675">Cheers Alan</span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym18_1_1459471359731_2509"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym18_1_1459471359731_2555" style="display: block;"> <div id="yui_3_16_0_ym18_1_1459471359731_2554" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym18_1_1459471359731_2553" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym18_1_1459471359731_2552" dir="ltr"> <font id="yui_3_16_0_ym18_1_1459471359731_2551" face="Arial" size="2"> <hr size="1"> <b><span style="font-weight: bold;">From:</span></b> Hugh Fulton via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> 'Personal Submersibles General Discussion' <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, April 1, 2016 1:23 PM<br> <b id="yui_3_16_0_ym18_1_1459471359731_2677"><span id="yui_3_16_0_ym18_1_1459471359731_2676" style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym18_1_1459471359731_2556"><br><div id="yiv0542981940"><style>#yiv0542981940 #yiv0542981940 --
_filtered #yiv0542981940 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}
_filtered #yiv0542981940 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}
_filtered #yiv0542981940 {font-family:helveticaneue;panose-1:0 0 0 0 0 0 0 0 0 0;}
#yiv0542981940
#yiv0542981940 p.yiv0542981940MsoNormal, #yiv0542981940 li.yiv0542981940MsoNormal, #yiv0542981940 div.yiv0542981940MsoNormal
{margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}
#yiv0542981940 a:link, #yiv0542981940 span.yiv0542981940MsoHyperlink
{color:blue;text-decoration:underline;}
#yiv0542981940 a:visited, #yiv0542981940 span.yiv0542981940MsoHyperlinkFollowed
{color:purple;text-decoration:underline;}
#yiv0542981940 p.yiv0542981940MsoAcetate, #yiv0542981940 li.yiv0542981940MsoAcetate, #yiv0542981940 div.yiv0542981940MsoAcetate
{margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;}
#yiv0542981940 span.yiv0542981940EmailStyle17
{color:#1F497D;}
#yiv0542981940 span.yiv0542981940EmailStyle18
{color:#1F497D;}
#yiv0542981940 span.yiv0542981940BalloonTextChar
{}
#yiv0542981940 .yiv0542981940MsoChpDefault
{font-size:10.0pt;}
_filtered #yiv0542981940 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}
#yiv0542981940 div.yiv0542981940WordSection1
{}
#yiv0542981940 </style><div id="yui_3_16_0_ym18_1_1459471359731_2560"><div class="yiv0542981940WordSection1" id="yui_3_16_0_ym18_1_1459471359731_2559"><div class="yiv0542981940MsoNormal" id="yui_3_16_0_ym18_1_1459471359731_2558"><span id="yui_3_16_0_ym18_1_1459471359731_2557" style="font-size: 11pt;">So is the oil around the armature as well as between the seals? </span></div><div class="yiv0542981940MsoNormal" id="yui_3_16_0_ym18_1_1459471359731_2561"><span style="font-size: 11pt;"> </span></div><div class="yiv0542981940yqt9536567908" id="yiv0542981940yqt86936"><div id="yui_3_16_0_ym18_1_1459471359731_2565"><div id="yui_3_16_0_ym18_1_1459471359731_2564" style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) currentColor currentColor; padding: 3pt 0cm 0cm; border-image: none;"><div class="yiv0542981940MsoNormal" id="yui_3_16_0_ym18_1_1459471359731_2563"><b><span style="font-size: 10pt;">From:</span></b><span id="yui_3_16_0_ym18_1_1459471359731_2562" style="font-size: 10pt;"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Alan via Personal_Submersibles<br clear="none"><b>Sent:</b> Friday, 1 April 2016 12:36 p.m.<br clear="none"><b>To:</b> Personal Submersibles General Discussion<br clear="none"><b>Subject:</b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster</span></div></div></div><div class="yiv0542981940MsoNormal" id="yui_3_16_0_ym18_1_1459471359731_2566"> </div><div><div class="yiv0542981940MsoNormal">Hugh,</div></div><div><div class="yiv0542981940MsoNormal">it will see it equally from both sides. The system is oil filled & compensated with air</div></div><div><div class="yiv0542981940MsoNormal">pressure further up the wiring tube, the oil will extend up the wiring tube & fill all the</div></div><div><div class="yiv0542981940MsoNormal">housing cavities in case this isn't clear.</div></div><div><div class="yiv0542981940MsoNormal">Cheers Alan<br clear="none"><br clear="none">Sent from my iPad</div></div><div><div class="yiv0542981940MsoNormal" style="margin-bottom: 12pt;"><br clear="none">On 1/04/2016, at 12:23 pm, Hugh Fulton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</div></div><blockquote style="margin-top: 5pt; margin-bottom: 5pt;"><div><div class="yiv0542981940MsoNormal"><span style="font-size: 11pt;">Alan the inner seal will see all the pressure. Hugh</span></div><div class="yiv0542981940MsoNormal"><span style="font-size: 11pt;"> </span></div><div><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) currentColor currentColor; padding: 3pt 0cm 0cm; border-image: none;"><div class="yiv0542981940MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> Personal_Submersibles [<a href="mailto:personal_submersibles-bounces@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles-bounces@psubs.org">mailto:personal_submersibles-bounces@psubs.org</a>] <b>On Behalf Of </b>Alan James via Personal_Submersibles<br clear="none"><b>Sent:</b> Friday, 1 April 2016 11:48 a.m.<br clear="none"><b>To:</b> Personal Submersibles General Discussion<br clear="none"><b>Subject:</b> [PSUBS-MAILIST] MK 2 Brushless Thruster</span></div></div></div><div class="yiv0542981940MsoNormal"> </div><div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7015"><div class="yiv0542981940MsoNormal" style="background: white;"><span>This is the latest iteration.</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7016"><div class="yiv0542981940MsoNormal" style="background: white;"><span>The purpose of the project is to adapt a mass produced brushless DC motor</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7078"><div class="yiv0542981940MsoNormal" style="background: white;"><span>manufactured for the hobby market, to a direct drive low maintenance thruster</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7088"><div class="yiv0542981940MsoNormal" style="background: white;"><span>purpose built for submersibles. The motor can run at 2000W continuously but</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7137"><div class="yiv0542981940MsoNormal" style="background: white;"><span>will probably only need to be run at less than half of that for a reasonable</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7138"><div class="yiv0542981940MsoNormal" style="background: white;"><span>underwater speed.</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7139"><div class="yiv0542981940MsoNormal" style="background: white;"><span>In this version I have taken all the axial load off the 2 small motor bearings by</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7140"><div class="yiv0542981940MsoNormal" style="background: white;"><span>putting 2 circlips on the propeller shaft either side of the main bearing at the front</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7183"><div class="yiv0542981940MsoNormal" style="background: white;"><span>of the housing (second circlip not visible in dwg). Also I have used a larger outer </span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7247"><div class="yiv0542981940MsoNormal" style="background: white;"><span>rotary seal to be able to press it against a shoulder. The inner seal sees no pressure differential & is pressed against an internal circlip on one side. </span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7267"><div class="yiv0542981940MsoNormal" style="background: white;"><span>Some of the design is dictated by the assembly process. In assembly I will need to </span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7352"><div class="yiv0542981940MsoNormal" style="background: white;"><span>first press in the bearing then push through the propeller shaft with the internal clip on. </span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7353"><div class="yiv0542981940MsoNormal" style="background: white;"><span>Next assemble the housing then fit the second shaft circlip & finally the seals.</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7377"><div class="yiv0542981940MsoNormal" style="background: white;"><span>The motor is located in the back housing with 4 pins.</span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7570"><div class="yiv0542981940MsoNormal" style="background: white;"><span>Alan </span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7397"><div class="yiv0542981940MsoNormal" style="background: white;"><span> </span></div></div><div id="yiv0542981940yui_3_16_0_ym18_1_1459461551941_7327"><div class="yiv0542981940MsoNormal" style="background: white;"><span> </span></div></div></div></div></blockquote><blockquote style="margin-top: 5pt; margin-bottom: 5pt;"><div><div class="yiv0542981940MsoNormal">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></div></div></blockquote></div></div></div></div><br><div class="yqt9536567908" id="yqt70779">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>