<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div><div></div><div>Thanks Alan appreciate your input on the thruster testing. </div><div>Regards</div><div>Glen</div><div><br></div><div><br></div><div><div style="font-size:10px;color:#575757">Sent from Samsung Mobile</div></div></div><br><br>-------- Original message --------<br>From: T Novak via Personal_Submersibles <personal_submersibles@psubs.org> <br>Date:30/01/2016 18:20 (GMT+02:00) <br>To: 'Personal Submersibles General Discussion' <personal_submersibles@psubs.org> <br>Subject: Re: [PSUBS-MAILIST] Brushless thruster test <br><br><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks for the update, Alan.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">It looks like your research is coming along quite well.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Tim<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p><div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Alan James via Personal_Submersibles<br><b>Sent:</b> Saturday, January 30, 2016 1:47 AM<br><b>To:</b> Personal Submersibles General Discussion <personal_submersibles@psubs.org><br><b>Subject:</b> [PSUBS-MAILIST] Brushless thruster test<o:p></o:p></span></p></div></div><p class="MsoNormal"><o:p> </o:p></p><div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">I had an initial pool test of my brushless thruster yesterday.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">Thruster is on projects page <a href="http://www.psubs.org/projects/1235435392/brushlessthruster/" id="yui_3_16_0_1_1454145865918_2517">http://www.psubs.org/projects/1235435392/brushlessthruster/</a><o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">A bit of a mixed bag. Firstly I was testing it on 36-37 V & not 44 that it was designed for,<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">due to size restrictions on import of Lithium polymer batteries. I will buy the additional voltage.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black"> I was getting 5kg (11lb) thrust off 150W & 10kg (22lb) off 515W, which is comparable &<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">better than some commercial direct drive BLDC thrusters that I have specs on.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">However I got to 13kg thrust & the propeller seemed to slip at that point & even though <o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">it was running at 2,200W I wasn't getting any more thrust. I was only a couple of feet out <o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">from the pool edge when testing, so that could be contributing.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">Another factor could have been that the seal leaked badly & the motor was short circuiting <o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">through the water. Why did the seal leak? Possibly I damaged it hammering it in to it's housing<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">or because I didn't polish up the propeller shaft. <o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">I have other motors I will be testing, so a lot more work & learning to do on this one.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">I did notice I had the same problem as Cliff, with the motor wiring starting to wear through<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">where it comes out of the housing.<o:p></o:p></span></p></div><div id="yui_3_16_0_1_1454145865918_2479"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">Cheers Alan<o:p></o:p></span></p></div></div></div></body>