<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Correction, the inner seal is against the shoulder of the housing.</div><div>Alan<br><br>Sent from my iPad</div><div><br>On 1/04/2016, at 11:47 am, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><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_1459461551941_7015"> This is the latest iteration.</div><div id="yui_3_16_0_ym18_1_1459461551941_7016">The purpose of the project is to adapt a mass produced brushless DC motor</div><div id="yui_3_16_0_ym18_1_1459461551941_7078" dir="ltr">manufactured for the hobby market, to a direct drive low maintenance thruster</div><div id="yui_3_16_0_ym18_1_1459461551941_7088" dir="ltr">purpose built for submersibles. The motor can run at 2000W continuously but</div><div id="yui_3_16_0_ym18_1_1459461551941_7137" dir="ltr">will probably only need to be run at less than half of that for a reasonable</div><div id="yui_3_16_0_ym18_1_1459461551941_7138" dir="ltr">underwater speed.</div><div id="yui_3_16_0_ym18_1_1459461551941_7139" dir="ltr">In this version I have taken all the axial load off the 2 small motor bearings by</div><div id="yui_3_16_0_ym18_1_1459461551941_7140" dir="ltr">putting 2 circlips on the propeller shaft either side of the main bearing at the front</div><div id="yui_3_16_0_ym18_1_1459461551941_7183" dir="ltr">of the housing (second circlip not visible in dwg). Also I have used a larger outer </div><div id="yui_3_16_0_ym18_1_1459461551941_7247" dir="ltr">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. </div><div id="yui_3_16_0_ym18_1_1459461551941_7267" dir="ltr">Some of the design is dictated by the assembly process. In assembly I will need to </div><div id="yui_3_16_0_ym18_1_1459461551941_7352" dir="ltr">first press in the bearing then push through the propeller shaft with the internal clip on. </div><div id="yui_3_16_0_ym18_1_1459461551941_7353" dir="ltr">Next assemble the housing then fit the second shaft circlip & finally the seals.</div><div id="yui_3_16_0_ym18_1_1459461551941_7377" dir="ltr">The motor is located in the back housing with 4 pins.</div><div id="yui_3_16_0_ym18_1_1459461551941_7570" dir="ltr">Alan </div><div id="yui_3_16_0_ym18_1_1459461551941_7397" dir="ltr"><br></div><div id="yui_3_16_0_ym18_1_1459461551941_7327" dir="ltr"><br></div></div></div></blockquote><blockquote type="cite"><div><BLDC Thruster.jpg></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>