<html><head></head><body><div class="ydp885e4ee9yahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div></div>
<div dir="ltr" data-setdir="false">Ian, you aren't the only one with a propensity to avert social media which is why we keep the email list going. Although I have an account on FB I do not visit it often and would prefer that it (and Zuckerburg) disappeared.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">But back to submarines...Alan, what is the performance affect of reducing the voltage from 48 to 36? I suspect you lose rpm but wonder if that translates to torque and thrust as well. Is there anyway to calculate those losses?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Jon</div><div dir="ltr" data-setdir="false"><br></div><div><br></div>
</div><div id="ydp7b0087e1yahoo_quoted_2513173028" class="ydp7b0087e1yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Saturday, December 9, 2023 at 11:02:08 PM EST, irox via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="ydp7b0087e1yiv4486947212"><div><div style="color:rgb(0,0,0);font-family:arial, sans-serif;font-size:12pt;"><p style="margin:0;line-height:1.0;">Hi Allen,</p>
<p style="margin:0;line-height:1.0;"> </p>
<p style="margin:0;line-height:1.0;">Thanks for sharing that write up, I really appreciate it.</p>
<p style="margin:0;line-height:1.0;">I do have hopes for brushless motors and oil</p>
<p style="margin:0;line-height:1.0;">compensation. At some point I'll pick up a cheap unit</p>
<p style="margin:0;line-height:1.0;">and play around with. hopefully we can figure which</p>
<p style="margin:0;line-height:1.0;">ones are not putting electronics in the motor bodies.</p>
<p style="margin:0;line-height:1.0;"> </p>
<p style="margin:0;line-height:1.0;">I was present when Cliff emptied the black sludge</p>
<p style="margin:0;line-height:1.0;">out and immediately thought I should start thinking</p>
<p style="margin:0;line-height:1.0;">about brushless motors, even if they aren't as suited</p>
<p style="margin:0;line-height:1.0;">for low rpm applications like ours.</p>
<p style="margin:0;line-height:1.0;"> </p>
<p style="margin:0;line-height:1.0;">Also apologies for calling James (and not even</p>
<p style="margin:0;line-height:1.0;">Spelling that correctly!). Power is out here and I</p>
<p style="margin:0;line-height:1.0;">Am poor at typing on the phone.</p>
<p style="margin:0;line-height:1.0;"> </p>
<p style="margin:0;line-height:1.0;">Sorry about the extra work. My avoidance of Facebook</p>
<p style="margin:0;line-height:1.0;">is for personal ethical reasons.</p>
<p style="margin:0;line-height:1.0;"> </p>
<p style="margin:0;line-height:1.0;">Thanks!</p>
<p style="margin:0;line-height:1.0;"> Ian.</p>
<p style="margin:0;line-height:1.0;"> </p>
<p style="margin:0;line-height:1.0;"> </p>
</div>
<div id="ydp7b0087e1yiv4486947212yqt69338" class="ydp7b0087e1yiv4486947212yqt5898519081"><div style="border-left:1px solid #aaa;padding:10px 0 10px 15px;margin:0;" class="ydp7b0087e1yiv4486947212elnk-inline-message-container">
<p>-----Original Message-----<br clear="none">From: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none">Sent: Dec 9, 2023 7:07 PM<br clear="none">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none">Subject: Re: [PSUBS-MAILIST] Pressure proof motor</p>
<p style="margin:0;line-height:1.0;"> </p>
<div id="ydp7b0087e1yiv4486947212">
<div>Ian,
<div>I tried twice to send pictures but files must be too big for this format. The last time I only attached two photos.</div>
<div>The Psubs facebook page has 900+ followers. I have photos & videos on two posts about the thruster.</div>
<div>There is another post on an air compensator I built that may be of interest to you.</div>
<div>The fb format is a lot easier to put up photos and videos on. Also you can post comments and "like" what someone has posted or said without them going out to everyone & filling up their mail box.</div>
<div>But here is a portion of the failed mail.....</div>
<div> </div>
<div>
<div>Brushless 2200W rated to 48V but could run off 36V.</div>
<div>I bought the bottom unit only as was half the price.</div>
<div>Motor only weighed 15lbs (7kg).</div>
<div>A lot of empty space inside the can. Probably take a litre</div>
<div>of oil to compensate it. But lots of area to put in fill & drain holes. It has a skeg on the bottom which I will cut off (should I use it). The motor portion of the cut off skeg would be a good place to put a drain hole in. It has two lip seals and a dust seal. Two decent sized bearings. </div>
<div>The o-ring groove & mating face were done well. </div>
<div>The hole that the wire came out through was sharp on the edge; they could have rounded that to stop it wearing on the wiring jacket.</div>
<div>It is a sensor-less motor, so no position feed back from sensors, but then the sensors are usually the first thing to fail. </div>
<div>In my view it would be a much better option for oil compensation than a brushed motor like the Minn Kotta, where the oil can lift the brushes or be contaminated by wearing brushes. One post recently seemed to indicate that the compensating oil was degrading the brushes.</div>
<div>At the front end there are holes that have been filled in with something. There may be thread in the holes to bolt on an anode. If not, they could be drilled out to put in an anode. </div>
<div>The propeller is about 4&1/2 to 5" pitch ( cant remember the diameter & am out). Designed for pushing a boat up to 20ft. The motor is quite a large diameter to get more torque & is geared down, with the low pitched propeller, ideal for pushing a sub.</div>
<div>There may be a better motor out there that doesnt require such a huge volume of oil or air to compensate it. </div>
<div>If you are looking for a brushless option, some of the motors have electronics inside them, including large capacitors that will crush under pressure. </div>
<div>Cheers Alan</div>
</div>
<div> </div>
<div> </div>
<div><br clear="none"><br clear="none">
<div id="ydp7b0087e1yiv4486947212ymail_android_signature"><a shape="rect" id="ydp7b0087e1yiv4486947212ymail_android_signature_link" href="https://mail.onelink.me/107872968?pid=nativeplacement&c=Global_Acquisition_YMktg_315_Internal_EmailSignature&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000604&af_sub5=EmailSignature__Static_" rel="nofollow" target="_blank">Sent from Yahoo Mail on Android</a></div>
<br clear="none">
<blockquote style="margin:0 0 20px 0;">
<div id="ydp7b0087e1yiv4486947212yqt73831" class="ydp7b0087e1yiv4486947212yqt4076640870">
<div style="font-family:Roboto, sans-serif;color:#6d00f6;">
<div>On Sun, 10 Dec 2023 at 8:55 am, irox via Personal_Submersibles</div>
<div><personal_submersibles@psubs.org> wrote:</div>
</div>
<div style="padding:10px 0 0 20px;margin:10px 0 0 0;border-left:1px solid #6D00F6;">
<div id="ydp7b0087e1yiv4486947212">
<div style="color:#000000;font-family:arial, sans-serif;font-size:12pt;">
<p style="margin:0;line-height:1.0;">Hi Jamie's,</p>
<p style="margin:0;line-height:1.0;"> </p>
<p style="margin:0;line-height:1.0;">Thanks for doing that and creating a write up of it. I am interested</p>
<p style="margin:0;line-height:1.0;">to know how it went. Wo<span style="font-size:12pt;">uld it be possible to get a copy of that? </span></p>
<p style="margin:0;line-height:1.0;"><span style="font-size:12pt;"> Or a summary maybe?</span></p>
<p style="margin:0;line-height:1.0;"> </p>
<p style="margin:0;line-height:1.0;">The Facebook group is closed to non-facebook members, and</p>
<p style="margin:0;line-height:1.0;">I am not going to join Facebook any time soon.</p>
<p style="margin:0;line-height:1.0;"> </p>
<p style="margin:0;line-height:1.0;">Thanks,</p>
<p style="margin:0;line-height:1.0;">Ian </p>
<p style="margin:0;line-height:1.0;"> </p>
</div>
<div style="border-left:1px solid #aaa;padding:10px 0 10px 15px;margin:0;" class="ydp7b0087e1yiv4486947212elnk-inline-message-container">
<p>-----Original Message-----<br clear="none">From: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none">Sent: Dec 9, 2023 10:38 AM<br clear="none">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none">Subject: Re: [PSUBS-MAILIST] Pressure proof motor</p>
<p style="margin:0;line-height:1.0;"> </p>
James,
<div>I did two posts on Psubs facebook page about the motor.</div>
<div>I pulled it apart for the second post.</div>
<div>Alan<br clear="none"><br clear="none">
<div id="ydp7b0087e1yiv4486947212ymail_android_signature"><a shape="rect" id="ydp7b0087e1yiv4486947212ymail_android_signature_link" href="https://mail.onelink.me/107872968?pid=nativeplacement&c=Global_Acquisition_YMktg_315_Internal_EmailSignature&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000604&af_sub5=EmailSignature__Static_" rel="nofollow" target="_blank">Sent from Yahoo Mail on Android</a></div>
<br clear="none">
<blockquote style="margin:0 0 20px 0;">
<div style="font-family:Roboto, sans-serif;color:#6d00f6;">
<div>On Wed, 29 Nov 2023 at 2:07 am, James Frankland via Personal_Submersibles</div>
<div><personal_submersibles@psubs.org> wrote:</div>
</div>
<div style="padding:10px 0 0 20px;margin:10px 0 0 0;border-left:1px solid #6D00F6;">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></div>
</blockquote>
</div>
</div>
<p style="margin:0;line-height:1.0;"> </p>
</div>
_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></div>
</div>
</blockquote>
</div>
</div>
</div>
</div></div>
<p style="margin:0;line-height:1.0;"> </p></div></div><div class="ydp7b0087e1yqt5898519081" id="ydp7b0087e1yqt12973">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
</div>
</div></body></html>