<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_1454178523945_3144"><span>Hank, Tim.</span></div><div id="yui_3_16_0_1_1454178523945_3144"><span id="yui_3_16_0_1_1454178523945_3234">With a load on it should be about 1300 rpm.</span></div><div id="yui_3_16_0_1_1454178523945_3144" dir="ltr"><span id="yui_3_16_0_1_1454178523945_3235">It was leaking just sitting in the pool. When I got home</span></div><div id="yui_3_16_0_1_1454178523945_3144" dir="ltr"><span id="yui_3_16_0_1_1454178523945_3236">I poured a low viscosity oil in the wire entry & it just flowed</span></div><div id="yui_3_16_0_1_1454178523945_3144" dir="ltr"><span>out the seal. </span></div><div id="yui_3_16_0_1_1454178523945_3144" dir="ltr"><span>It is quite a learning experience. There are some big gaps in my understanding </span></div><div id="yui_3_16_0_1_1454178523945_3144" dir="ltr"><span>of the maths of what is going on.</span></div><div id="yui_3_16_0_1_1454178523945_3144" dir="ltr"><span>I am getting a 1500W sensored motor with low kv & an operational voltage of 44V</span></div><div id="yui_3_16_0_1_1454178523945_3144" dir="ltr"><span>made up for me. The motors I have are sensorless & it is hard to find a good</span></div><div id="yui_3_16_0_1_1454178523945_3144" dir="ltr"><span>speed controller with reverse for sensorless motors.</span></div><div id="yui_3_16_0_1_1454178523945_3144" dir="ltr"><span>Alan</span></div><br> <div class="qtdSeparateBR" id="yui_3_16_0_1_1454178523945_3237"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_1_1454178523945_3241" 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_1454178523945_3240"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1454178523945_3239"> <div dir="ltr" id="yui_3_16_0_1_1454178523945_3238"> <font size="2" face="Arial" id="yui_3_16_0_1_1454178523945_3598"> <hr size="1" id="yui_3_16_0_1_1454178523945_3597"> <b><span style="font-weight:bold;">From:</span></b> hank pronk 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 7:08 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_1454178523945_3599"><br><div id="yiv8391218814"><div id="yui_3_16_0_1_1454178523945_3629"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;" id="yui_3_16_0_1_1454178523945_3628"><div id="yui_3_16_0_1_1454178523945_3627"><span>Alan,</span></div><div><span>That motor looks pretty nice! I still think rpm is your enemy, seal wise.</span></div><div id="yui_3_16_0_1_1454178523945_3630"><span>Hank</span></div> <div class="yiv8391218814qtdSeparateBR" id="yui_3_16_0_1_1454178523945_3631"><br clear="none"><br clear="none"></div><div class="yiv8391218814yahoo_quoted" style="display:block;" id="yui_3_16_0_1_1454178523945_3640"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;" id="yui_3_16_0_1_1454178523945_3639"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;" id="yui_3_16_0_1_1454178523945_3638"> <div class="yiv8391218814yqt9703406396" id="yiv8391218814yqt89392"><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="yiv8391218814y_msg_container" id="yui_3_16_0_1_1454178523945_3637"><div id="yiv8391218814"><style>#yiv8391218814 --
filtered {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;}
#yiv8391218814 filtered {panose-1:2 4 5 3 5 4 6 3 2 4;}
#yiv8391218814 filtered {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}
#yiv8391218814
p.yiv8391218814MsoNormal, #yiv8391218814 li.yiv8391218814MsoNormal, #yiv8391218814 div.yiv8391218814MsoNormal
{margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}
#yiv8391218814 a:link, #yiv8391218814 span.yiv8391218814MsoHyperlink
{color:blue;text-decoration:underline;}
#yiv8391218814 a:visited, #yiv8391218814 span.yiv8391218814MsoHyperlinkFollowed
{color:purple;text-decoration:underline;}
#yiv8391218814 span.yiv8391218814EmailStyle17
{color:#1F497D;}
#yiv8391218814 .yiv8391218814MsoChpDefault
{font-size:10.0pt;}
#yiv8391218814 filtered {margin:1.0in 1.0in 1.0in 1.0in;}
#yiv8391218814 div.yiv8391218814WordSection1
{}
#yiv8391218814 </style><div id="yui_3_16_0_1_1454178523945_3636"><div class="yiv8391218814WordSection1" id="yui_3_16_0_1_1454178523945_3635"><div class="yiv8391218814MsoNormal"><span style="font-size:11.0pt;">Thanks for the update, Alan.</span></div><div class="yiv8391218814MsoNormal"><span style="font-size:11.0pt;">It looks like your research is coming along quite well.</span></div><div class="yiv8391218814MsoNormal"><span style="font-size:11.0pt;">Tim</span></div><div class="yiv8391218814MsoNormal"><span style="font-size:11.0pt;"> </span></div><div class="yiv8391218814yqt3375004579" id="yiv8391218814yqt31419"><div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;"><div class="yiv8391218814MsoNormal"><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="yiv8391218814MsoNormal"> </div><div id="yui_3_16_0_1_1454178523945_3634"><div id="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" style="background:white;"><span style="">I had an initial pool test of my brushless thruster yesterday.</span></div></div><div id="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" style="background:white;"><span style="">Thruster is on projects page <a rel="nofollow" shape="rect" id="yiv8391218814yui_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="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" 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="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" 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="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" 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="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" style="background:white;"><span style="">better than some commercial direct drive BLDC thrusters that I have specs on.</span></div></div><div id="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" style="background:white;" id="yui_3_16_0_1_1454178523945_3633"><span style="" id="yui_3_16_0_1_1454178523945_3632">However I got to 13kg thrust & the propeller seemed to slip at that point & even though </span></div></div><div id="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" 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="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" style="background:white;"><span style="">from the pool edge when testing, so that could be contributing.</span></div></div><div id="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" 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="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" 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="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" style="background:white;"><span style="">or because I didn't polish up the propeller shaft. </span></div></div><div id="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" 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="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" 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="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" style="background:white;"><span style="">where it comes out of the housing.</span></div></div><div id="yiv8391218814yui_3_16_0_1_1454145865918_2479"><div class="yiv8391218814MsoNormal" style="background:white;"><span style="">Cheers Alan</span></div></div></div></div></div></div></div><br clear="none"><div class="yiv8391218814yqt3375004579" id="yiv8391218814yqt64408">_______________________________________________<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="yqt9703406396" id="yqt08838">_______________________________________________<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>