<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>I thought the ceramic seals were the way to go on those motors.</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] Brushless Thruster<BR>Date: Mon, 3 Oct 2016 22:44:10 +0000 (UTC)<BR><BR></DIV><DIV style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><DIV><SPAN>Alan,</SPAN></DIV><DIV dir="ltr"><SPAN>You are right, the mechanical seal is the easiest way to go. My Perry thrusters had simple spring loaded seals with a sealed cavity behind the mechanical seal. You will be oil </SPAN>filled, so the seal will have the back up oil.</DIV><DIV dir="ltr">Hank</DIV> <DIV><BR><BR></DIV><DIV 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 face="Arial" size="2"> On Monday, October 3, 2016 1:27 PM, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<BR></FONT></DIV> <BR><BR> <DIV><DIV><DIV><DIV>Hank,</DIV><DIV>yes I like the idea of going straight to the penetrator with the clear tube attaching</DIV><DIV>on to a barbed fitting. I want to put a 4psi overpressure in the system & are</DIV><DIV>intending to do this with compressed air; so need to tee in an air line. I also</DIV><DIV>need an oil filling point, however the air connection point could double for this.</DIV><DIV>I like the clear tube as it is a visual indication of the oil level.</DIV><DIV>I have 2 lip seals at the moment. Hugh wasn't too impressed with that idea</DIV><DIV>& thought I should go with a mechanical seal. From what I have read, the shaft</DIV><DIV>the lip seal runs on needs to be plunge ground to a certain finish, & a mechanical</DIV><DIV>seal would eliminate that precision process.</DIV><DIV>Also I look at what other large manufacturers have done & figure they have</DIV><DIV>done the research on seals & have the experience.</DIV><DIV>Cheers Alan</DIV><DIV><BR>Sent from my iPad</DIV><DIV><DIV><BR>On 4/10/2016, at 12:37 am, hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><DIV><SPAN>Alan,</SPAN></DIV><DIV><SPAN>You can make up a pretty simple penetrator for the wires, or why not leave the wires the way they are in the clear tube and run the tube to a penetrator on the sub that is made from a barbed fitting. The clear tube can be oil filled and act as your compensator. I know you already though of this. I think the DW's work like that.</SPAN></DIV><DIV>If you are oil filled, why the mechanical seal. Just go with a higher pressure rated lip seal.</DIV><DIV>Hank</DIV> <DIV><BR><BR></DIV><DIV 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 face="Arial" size="2"> On Monday, October 3, 2016 3:40 AM, Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR></FONT></DIV> <BR><BR> <DIV><DIV><DIV><DIV>Hi Hank, thanks.</DIV><DIV>yes am intending on getting that type of seal, but I will try & get some advice</DIV><DIV>on an appropriate seal for the viscosity & type of oil I am using (Morlina S2 Bl 10).</DIV><DIV>Must be a bit barmy because I was getting quite excited about the new </DIV><DIV>compensating oil I bought. </DIV><DIV>I haven't quite decided how I am going to terminate the wires coming out of the </DIV><DIV>motor. At present I have the wires running through a clear hose up to a manifold.</DIV><DIV>I say manifold but it is a modified brass T plumbing fitting. The hose is hose clamped</DIV><DIV>to one end & the wires are silicone sealed coming out the other end. On the T I have</DIV><DIV>a plug that I can remove to fill the tube & thruster with oil. This is okay for experimental</DIV><DIV>purposes but will need to add pressure to the system & a through hull fitting</DIV><DIV>when I mount it on the sub.</DIV><DIV>Alan</DIV><DIV><BR><BR>Sent from my iPad</DIV><DIV><DIV><BR>On 3/10/2016, at 9:28 pm, hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><DIV><SPAN>Alan,</SPAN></DIV><DIV dir="ltr"><SPAN>That is great! well done.. What type of mechanical seal will you use? Are you planning a spring loaded pump seal? </SPAN></DIV><DIV dir="ltr"><SPAN>Hank </SPAN></DIV> <DIV><BR><BR></DIV><DIV 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 face="Arial" size="2"> On Monday, October 3, 2016 2:07 AM, Alan via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR></FONT></DIV> <BR><BR> <DIV>Just did a pool test of my latest brushless thruster.<BR>This thruster uses a 60kv (revs per Volt) 6374 (dimensions in mm) brushless<BR>sensored outrunner motor. The propeller was a 3 bladed 7&1/4" x 4" with no kort nozzle.<BR>I was getting 30kg (66lb) thrust from 30 amps off 52 volts (1560W) with the thruster<BR>oil filled. This seems comparable to what Cliff was getting from his Minnkota 101.<BR>The difference is this is a much smaller unit. I have been keeping a file on<BR>performance statistics of commercial thrusters & trolling motors & this is slightly <BR>above average.<BR>The manufacturer told me not to run the motor more than 40 amps continuosly,<BR>so I am being conservative with the 30 amp draw. I could bump it up by putting<BR>on a bigger prop.<BR>Next step is to use it as a boat motor & notch up 100 or so hours, then build<BR>another housing with a mechanical seal.<BR>Added a couple of photos to the project page, but they loaded upside down for<BR>some reason. Couldn't change them. <BR> <A href="http://www.psubs.org/projects/1235435392/brushlessthruster/">http://www.psubs.org/projects/1235435392/brushlessthruster/</A><BR>Alan<BR><BR>Sent from my iPad<BR>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR><BR><BR></DIV> </DIV> </DIV> </DIV></DIV></DIV></BLOCKQUOTE></DIV><BLOCKQUOTE><DIV><SPAN>_______________________________________________</SPAN><BR><SPAN>Personal_Submersibles mailing list</SPAN><BR><SPAN><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A></SPAN><BR><SPAN><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A></SPAN><BR></DIV></BLOCKQUOTE></DIV></DIV><BR><DIV>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV><BR><BR></DIV> </DIV> </DIV> </DIV></DIV></DIV></BLOCKQUOTE></DIV><BLOCKQUOTE><DIV><SPAN>_______________________________________________</SPAN><BR><SPAN>Personal_Submersibles mailing list</SPAN><BR><SPAN><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A></SPAN><BR><SPAN><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A></SPAN><BR></DIV></BLOCKQUOTE></DIV></DIV><BR><DIV>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV><BR><BR></DIV> </DIV> </DIV> </DIV></DIV>_______________________________________________
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