<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div><span>Alan,</span></div><div><span>That motor looks pretty nice! I still think rpm is your enemy, seal wise.</span></div><div><span>Hank</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Saturday, January 30, 2016 9:20 AM, T Novak via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv6297382217"><style>#yiv6297382217 #yiv6297382217 --
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#yiv6297382217 </style><div><div class="yiv6297382217WordSection1"><div class="yiv6297382217MsoNormal"><span style="font-size:11.0pt;">Thanks for the update, Alan.</span></div><div class="yiv6297382217MsoNormal"><span style="font-size:11.0pt;">It looks like your research is coming along quite well.</span></div><div class="yiv6297382217MsoNormal"><span style="font-size:11.0pt;">Tim</span></div><div class="yiv6297382217MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv6297382217yqt3375004579" id="yiv6297382217yqt31419"><div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;"><div class="yiv6297382217MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;">From:</span></b><span lang="EN-US" style="font-size:11.0pt;"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Alan James via Personal_Submersibles<br clear="none"><b>Sent:</b> Saturday, January 30, 2016 1:47 AM<br clear="none"><b>To:</b> Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none"><b>Subject:</b> [PSUBS-MAILIST] Brushless thruster test</span></div></div></div><div class="yiv6297382217MsoNormal"> </div><div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">I had an initial pool test of my brushless thruster yesterday.</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">Thruster is on projects page <a rel="nofollow" shape="rect" id="yiv6297382217yui_3_16_0_1_1454145865918_2517" target="_blank" href="http://www.psubs.org/projects/1235435392/brushlessthruster/">http://www.psubs.org/projects/1235435392/brushlessthruster/</a></span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">A bit of a mixed bag. Firstly I was testing it on 36-37 V & not 44 that it was designed for,</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">due to size restrictions on import of Lithium polymer batteries. I will buy the additional voltage.</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style=""> I was getting 5kg (11lb) thrust off 150W & 10kg (22lb) off 515W, which is comparable &</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">better than some commercial direct drive BLDC thrusters that I have specs on.</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">However I got to 13kg thrust & the propeller seemed to slip at that point & even though </span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">it was running at 2,200W I wasn't getting any more thrust. I was only a couple of feet out </span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">from the pool edge when testing, so that could be contributing.</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">Another factor could have been that the seal leaked badly & the motor was short circuiting </span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">through the water. Why did the seal leak? Possibly I damaged it hammering it in to it's housing</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">or because I didn't polish up the propeller shaft. </span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">I have other motors I will be testing, so a lot more work & learning to do on this one.</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">I did notice I had the same problem as Cliff, with the motor wiring starting to wear through</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">where it comes out of the housing.</span></div></div><div id="yiv6297382217yui_3_16_0_1_1454145865918_2479"><div class="yiv6297382217MsoNormal" style="background:white;"><span style="">Cheers Alan</span></div></div></div></div></div></div></div><br><div class="yqt3375004579" id="yqt64408">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>