<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:helveticaneue;
panose-1:0 0 0 0 0 0 0 0 0 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Alan the inner seal will see all the pressure. Hugh<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Alan James via Personal_Submersibles<br><b>Sent:</b> Friday, 1 April 2016 11:48 a.m.<br><b>To:</b> Personal Submersibles General Discussion<br><b>Subject:</b> [PSUBS-MAILIST] MK 2 Brushless Thruster<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div id="yui_3_16_0_ym18_1_1459461551941_7015"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>This is the latest iteration.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7016"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>The purpose of the project is to adapt a mass produced brushless DC motor<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7078"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>manufactured for the hobby market, to a direct drive low maintenance thruster<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7088"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>purpose built for submersibles. The motor can run at 2000W continuously but<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7137"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>will probably only need to be run at less than half of that for a reasonable<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7138"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>underwater speed.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7139"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>In this version I have taken all the axial load off the 2 small motor bearings by<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7140"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>putting 2 circlips on the propeller shaft either side of the main bearing at the front<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7183"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>of the housing (second circlip not visible in dwg). Also I have used a larger outer <o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7247"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>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. <o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7267"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>Some of the design is dictated by the assembly process. In assembly I will need to <o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7352"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>first press in the bearing then push through the propeller shaft with the internal clip on. <o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7353"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>Next assemble the housing then fit the second shaft circlip & finally the seals.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7377"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>The motor is located in the back housing with 4 pins.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7570"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'>Alan <o:p></o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7397"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym18_1_1459461551941_7327"><p class=MsoNormal style='background:white'><span style='font-family:"helveticaneue","serif";color:black'><o:p> </o:p></span></p></div></div></div></body></html>