<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><span>Thanks Glen,</span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span id="yui_3_16_0_1_1454312902833_3091">there are a lot of direct drive brushless thrusters out there that are made for</span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span id="yui_3_16_0_1_1454312902833_3092">subs, ROVs & DPVs. I have performance specs on a number of them</span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span id="yui_3_16_0_1_1454312902833_3093">that I can compare with my results. So just a matter of finding the right</span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span id="yui_3_16_0_1_1454312902833_3203">motor & prop combination.</span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span id="yui_3_16_0_1_1454312902833_3094">I am now looking at sensored BLDC motors rather than the sensorless motors </span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span id="yui_3_16_0_1_1454312902833_3109">I have been using. This is because it is difficult to find speed controllers</span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span id="yui_3_16_0_1_1454312902833_3202">with reverse for the sensorless. The sensored motors are used in traction</span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span id="yui_3_16_0_1_1454312902833_3175">vehicles where they want a smoother start, whereas sensorless motors</span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span id="yui_3_16_0_1_1454312902833_3204">tend to be in things like RC planes that don't need reverse.</span></div><div dir="ltr" id="yui_3_16_0_1_1454312902833_2951"><span>Cheers Alan</span></div><br> <div class="qtdSeparateBR" id="yui_3_16_0_1_1454312902833_2950"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_1_1454312902833_3102" 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_1454312902833_3101"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1454312902833_3100"> <div dir="ltr" id="yui_3_16_0_1_1454312902833_3099"> <font size="2" face="Arial" id="yui_3_16_0_1_1454312902833_3098"> <hr size="1" id="yui_3_16_0_1_1454312902833_3108"> <b><span style="font-weight:bold;">From:</span></b> gbrown091 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> Monday, February 1, 2016 9:05 AM<br> <b id="yui_3_16_0_1_1454312902833_3206"><span style="font-weight: bold;" id="yui_3_16_0_1_1454312902833_3205">Subject:</span></b> Re: [PSUBS-MAILIST] Brushless thruster test<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1454312902833_3103"><br><div id="yiv3184213935"><div id="yui_3_16_0_1_1454312902833_3106"><div id="yui_3_16_0_1_1454312902833_3105"><div></div><div id="yui_3_16_0_1_1454312902833_3104">Thanks Alan appreciate your input on the thruster testing. </div><div id="yui_3_16_0_1_1454312902833_3107">Regards</div><div id="yui_3_16_0_1_1454312902833_3207">Glen</div><div id="yui_3_16_0_1_1454312902833_3208"><br clear="none"></div><div id="yui_3_16_0_1_1454312902833_3209"><br clear="none"></div><div><div style="font-size:10px;color:#575757;">Sent from Samsung Mobile</div></div></div><br clear="none"><br clear="none">-------- Original message --------<br clear="none">From: T Novak via Personal_Submersibles <br clear="none">Date:30/01/2016 18:20 (GMT+02:00) <br clear="none">To: 'Personal Submersibles General Discussion' <br clear="none">Subject: Re: [PSUBS-MAILIST] Brushless thruster test <br clear="none"><br clear="none"><div class="yiv3184213935yqt7484553266" id="yiv3184213935yqt69634"><div class="yiv3184213935WordSection1" id="yui_3_16_0_1_1454312902833_3218"><div class="yiv3184213935MsoNormal"><span style="font-size:11.0pt;">Thanks for the update, Alan.</span></div><div class="yiv3184213935MsoNormal"><span style="font-size:11.0pt;">It looks like your research is coming along quite well.</span></div><div class="yiv3184213935MsoNormal" id="yui_3_16_0_1_1454312902833_3217"><span style="font-size:11.0pt;">Tim</span></div><div class="yiv3184213935MsoNormal" id="yui_3_16_0_1_1454312902833_3219"><span style="font-size:11.0pt;"> </span></div><div id="yui_3_16_0_1_1454312902833_3221"><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;" id="yui_3_16_0_1_1454312902833_3220"><div class="yiv3184213935MsoNormal" id="yui_3_16_0_1_1454312902833_3222"><b><span lang="EN-US" style="font-size:11.0pt;">From:</span></b><span lang="EN-US" style="font-size:11.0pt;" id="yui_3_16_0_1_1454312902833_3223"> 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 id="yui_3_16_0_1_1454312902833_3224">Subject:</b> [PSUBS-MAILIST] Brushless thruster test</span></div></div></div><div class="yiv3184213935MsoNormal" id="yui_3_16_0_1_1454312902833_3225"> </div><div><div id="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" style="background:white;"><span style="">I had an initial pool test of my brushless thruster yesterday.</span></div></div><div id="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" style="background:white;"><span style="">Thruster is on projects page <a rel="nofollow" shape="rect" id="yiv3184213935yui_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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" 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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" 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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" 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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" style="background:white;"><span style="">better than some commercial direct drive BLDC thrusters that I have specs on.</span></div></div><div id="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" 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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" 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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" style="background:white;"><span style="">from the pool edge when testing, so that could be contributing.</span></div></div><div id="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" 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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" 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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" style="background:white;"><span style="">or because I didn't polish up the propeller shaft. </span></div></div><div id="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" 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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" 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="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" style="background:white;"><span style="">where it comes out of the housing.</span></div></div><div id="yiv3184213935yui_3_16_0_1_1454145865918_2479"><div class="yiv3184213935MsoNormal" style="background:white;"><span style="">Cheers Alan</span></div></div></div></div></div></div></div><br><div class="yqt7484553266" id="yqt29991">_______________________________________________<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>