<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_1_1454205349002_3664"><span id="yui_3_16_0_1_1454205349002_3665">Seal leak problem solved.</span></div><div dir="ltr" id="yui_3_16_0_1_1454205349002_3659"><span id="yui_3_16_0_1_1454205349002_3658">I had put in a 12mm seal instead of a 10mm ID seal.</span></div><div dir="ltr" id="yui_3_16_0_1_1454205349002_3657"><span id="yui_3_16_0_1_1454205349002_3656">Dumb, didn't even realize I had some that size.</span></div><div dir="ltr" id="yui_3_16_0_1_1454205349002_3655"><span>Alan</span></div><br> <div class="qtdSeparateBR" id="yui_3_16_0_1_1454205349002_3571"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_1_1454205349002_3692" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1454205349002_3691"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1454205349002_3690"> <div dir="ltr" id="yui_3_16_0_1_1454205349002_3689"> <font size="2" face="Arial" id="yui_3_16_0_1_1454205349002_3688"> <hr size="1" id="yui_3_16_0_1_1454205349002_3687"> <b><span style="font-weight:bold;">From:</span></b> Alan James 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> Sunday, January 31, 2016 7:43 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Brushless thruster test<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1454205349002_3693"><br><div id="yiv0105260126"><div id="yui_3_16_0_1_1454205349002_3695"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;" id="yui_3_16_0_1_1454205349002_3694"><div id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span>Hank, Tim.</span></div><div id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span id="yiv0105260126yui_3_16_0_1_1454178523945_3234">With a load on it should be about 1300 rpm.</span></div><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span id="yiv0105260126yui_3_16_0_1_1454178523945_3235">It was leaking just sitting in the pool. When I got home</span></div><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span id="yiv0105260126yui_3_16_0_1_1454178523945_3236">I poured a low viscosity oil in the wire entry & it just flowed</span></div><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span>out the seal. </span></div><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span id="yui_3_16_0_1_1454205349002_3696">It is quite a learning experience. There are some big gaps in my understanding </span></div><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span id="yui_3_16_0_1_1454205349002_3697">of the maths of what is going on.</span></div><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span id="yui_3_16_0_1_1454205349002_3698">I am getting a 1500W sensored motor with low kv & an operational voltage of 44V</span></div><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span id="yui_3_16_0_1_1454205349002_3699">made up for me. The motors I have are sensorless & it is hard to find a good</span></div><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span>speed controller with reverse for sensorless motors.</span></div><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3144"><span>Alan</span></div><br clear="none"> <div class="yiv0105260126qtdSeparateBR" id="yiv0105260126yui_3_16_0_1_1454178523945_3237"><br clear="none"><br clear="none"></div><div class="yiv0105260126yahoo_quoted" id="yiv0105260126yui_3_16_0_1_1454178523945_3241" style="display:block;"> <div id="yiv0105260126yui_3_16_0_1_1454178523945_3240" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div id="yiv0105260126yui_3_16_0_1_1454178523945_3239" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div class="yiv0105260126yqt0194151326" id="yiv0105260126yqt64874"><div dir="ltr" id="yiv0105260126yui_3_16_0_1_1454178523945_3238"> <font id="yiv0105260126yui_3_16_0_1_1454178523945_3598" size="2" face="Arial"> </font><hr id="yiv0105260126yui_3_16_0_1_1454178523945_3597" size="1"> <b><span style="font-weight:bold;">From:</span></b> hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Sunday, January 31, 2016 7:08 AM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Brushless thruster test<br clear="none"> </div> <div class="yiv0105260126y_msg_container" id="yiv0105260126yui_3_16_0_1_1454178523945_3599"><br clear="none"><div id="yiv0105260126"><div id="yiv0105260126yui_3_16_0_1_1454178523945_3629"><div id="yiv0105260126yui_3_16_0_1_1454178523945_3628" style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"><div id="yiv0105260126yui_3_16_0_1_1454178523945_3627"><span>Alan,</span></div><div id="yui_3_16_0_1_1454205349002_3701"><span id="yui_3_16_0_1_1454205349002_3700">That motor looks pretty nice! I still think rpm is your enemy, seal wise.</span></div><div id="yiv0105260126yui_3_16_0_1_1454178523945_3630"><span>Hank</span></div> <div class="yiv0105260126qtdSeparateBR" id="yiv0105260126yui_3_16_0_1_1454178523945_3631"><br clear="none"><br clear="none"></div><div class="yiv0105260126yahoo_quoted" id="yiv0105260126yui_3_16_0_1_1454178523945_3640" style="display:block;"> <div id="yiv0105260126yui_3_16_0_1_1454178523945_3639" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"> <div id="yiv0105260126yui_3_16_0_1_1454178523945_3638" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div class="yiv0105260126yqt9703406396" id="yiv0105260126yqt89392"><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 clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv0105260126y_msg_container" id="yiv0105260126yui_3_16_0_1_1454178523945_3637"><div id="yiv0105260126"><style>#yiv0105260126 --
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#yiv0105260126 </style><div id="yiv0105260126yui_3_16_0_1_1454178523945_3636"><div class="yiv0105260126WordSection1" id="yiv0105260126yui_3_16_0_1_1454178523945_3635"><div class="yiv0105260126MsoNormal" id="yui_3_16_0_1_1454205349002_3702"><span style="font-size:11.0pt;" id="yui_3_16_0_1_1454205349002_3703">Thanks for the update, Alan.</span></div><div class="yiv0105260126MsoNormal" id="yui_3_16_0_1_1454205349002_3704"><span style="font-size:11.0pt;" id="yui_3_16_0_1_1454205349002_3705">It looks like your research is coming along quite well.</span></div><div class="yiv0105260126MsoNormal" id="yui_3_16_0_1_1454205349002_3706"><span style="font-size:11.0pt;">Tim</span></div><div class="yiv0105260126MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv0105260126yqt3375004579" id="yiv0105260126yqt31419"><div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;"><div class="yiv0105260126MsoNormal"><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="yiv0105260126MsoNormal"> </div><div id="yiv0105260126yui_3_16_0_1_1454178523945_3634"><div id="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" style="background:white;"><span style="">I had an initial pool test of my brushless thruster yesterday.</span></div></div><div id="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" style="background:white;"><span style="">Thruster is on projects page <a rel="nofollow" shape="rect" id="yiv0105260126yui_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="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" 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="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" 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="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" 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="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" style="background:white;"><span style="">better than some commercial direct drive BLDC thrusters that I have specs on.</span></div></div><div id="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" id="yiv0105260126yui_3_16_0_1_1454178523945_3633" style="background:white;"><span id="yiv0105260126yui_3_16_0_1_1454178523945_3632" style="">However I got to 13kg thrust & the propeller seemed to slip at that point & even though </span></div></div><div id="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" 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="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" style="background:white;"><span style="">from the pool edge when testing, so that could be contributing.</span></div></div><div id="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" 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="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" 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="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" style="background:white;"><span style="">or because I didn't polish up the propeller shaft. </span></div></div><div id="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" 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="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" 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="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" style="background:white;"><span style="">where it comes out of the housing.</span></div></div><div id="yiv0105260126yui_3_16_0_1_1454145865918_2479"><div class="yiv0105260126MsoNormal" style="background:white;"><span style="">Cheers Alan</span></div></div></div></div></div></div></div><br clear="none"><div class="yiv0105260126yqt3375004579" id="yiv0105260126yqt64408">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br clear="none"><br clear="none"></div></div> </div> </div> </div></div></div></div><br clear="none"><div class="yiv0105260126yqt9703406396" id="yiv0105260126yqt08838">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br clear="none"><br clear="none"></div></div> </div> </div> </div></div></div></div><br><div class="yqt0194151326" id="yqt41188">_______________________________________________<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>