<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Thanks Hank.</div><div>On this subject. I had some wicking of salt water up 2 foot of wire on</div><div>the inside of my sub. It stopped at the through hull. Obviously the</div><div>potting of the bare wires in the through hull did a good job holting this.</div><div>I am wondering if this wicking occurs on external wires where the</div><div>cable & insulation go in to the potting mix & at the point where a section of </div><div>wire is stripped. In other words, can the water pressure squeeze the</div><div>external wire cladding & get between it & the potting mix, then at the</div><div>point where the wire is stripped, turn backward & run up the inside of</div><div>the wire sheathing?</div><div>Any experience of this?</div><div>On my first ever potting attempt, I didn't strip back a section of the wire & </div><div>just ran it through a block of epoxy.</div><div>It leaked compensating fluid just with the pressure of gravity.</div><div>Alan</div><div><br><br>Sent from my iPad</div><div><br>On 23/12/2013, at 11:02 AM, hank pronk <<a href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt"><div><span>Joe,</span></div><div><span>The failure was unremarkable, it was a pin hole size leak through the potting material. I am not sure if the leak travelled along the bare wire first. There is no way to tell, I did drill it out and the material was well consolidated and cured. I have ordered new polyurethane because I suspect my old st material has frozen one to many times. I think I will stick to tried and true method though. That is a single threaded rod in a threaded fitting with oversized washer. I can pressurize one to 3,000 psi to see when and if it fails. That is the limit of my compressor.</span></div><div><span>Hank </span></div><div class="yahoo_quoted" style="display: block;"> <br> <br> <div style="font-family: HelveticaNeue, Helvetica
Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> On Sunday, December 22, 2013 2:48:55 PM, Joe Perkel <<a href="mailto:josephperkel@yahoo.com">josephperkel@yahoo.com</a>> wrote:<br> </font> </div> <div class="y_msg_container"><div id="yiv4026505323"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 14pt; background-color: rgb(255, 255, 255);"><div><span>Hank,</span></div><div><span><br clear="none"></span></div><div><span>What was the nature of the failure, leak, extrusion of potting material (epoxy) or a catastrophic mechanical failure? Knowing how things behave in failure is helpful in looking for potential warning signs ahead of time.</span></div><div><span><br clear="none"></span></div><div><span>Your test
program is pretty cool, a lot to learn here.</span></div><div><span><br clear="none"></span></div><div><span>Joe</span></div><div><span><br clear="none"></span></div><div><span><br clear="none"></span></div><div><span><br clear="none"></span></div><div><span><br clear="none"></span></div><div class="yiv4026505323yahoo_quoted" style="display: block;"> <br clear="none"> <br clear="none"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 14pt;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div class="yiv4026505323yqt0122537364" id="yiv4026505323yqt74140"><div dir="ltr"> <font face="Arial" size="2"> On Sunday, December 22, 2013 3:35 PM, hank pronk <<a href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>> wrote:<br clear="none"> </font> </div> <div class="yiv4026505323y_msg_container"><div id="yiv4026505323"><div><div style="color: rgb(0, 0, 0);
font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);"><div><span>Alan,</span></div><div><span>the fitting is tapered, it is pipe thread. As a safety, I have a washer of non conducting material under the nut to prevent the rod from pushing through the fitting.</span></div><div><span>Hank</span></div><div class="yiv4026505323yahoo_quoted" style="display: block;"> <br clear="none"> <br clear="none"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div class="yiv4026505323yqt3260197186" id="yiv4026505323yqt68879"><div dir="ltr"> <font face="Arial" size="2"> On Sunday, December 22, 2013 12:16:38 PM, Alan <<a href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>> wrote:<br clear="none">
</font> </div> <div class="yiv4026505323y_msg_container"><div id="yiv4026505323"><div><div>I follow,</div><div>you are
getting wicking down the wires, not a failure from</div><div>the epoxy extruding through the through hull fitting.</div><div>If your design did fail, It could be in a catastrophic manner.</div><div>I would want a bit of inward taper. Their is a perfect inward</div><div>taper angle, but not sure what it is. Aside from stopping the</div><div>potting mix extruding, the taper would compress the potting</div><div>compound around the wires under pressure</div><div>Alan<br clear="none"><br clear="none">Sent from my iPad</div><div class="yiv4026505323yqt6121984868" id="yiv4026505323yqt12914"><div><br clear="none">On 23/12/2013, at 7:49 AM, hank pronk <<a href="mailto:hanker_20032000@yahoo.ca" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue,
Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);"><div><span>Hi Alan,</span></div><div><span>There is only thread on the inside of the fitting for the epoxy to grab, but that seem good. I think the failure is from the smooth copper wire. If I use threaded rod it works perfect.</span></div><div><span>Hank</span></div><div class="yiv4026505323yahoo_quoted" style="display: block;"> <br clear="none"> <br clear="none"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> On Sunday, December 22, 2013 11:45:18 AM, Alan <<a href="mailto:alanlindsayjames@yahoo.com" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>> wrote:<br clear="none"> </font> </div> <div class="yiv4026505323y_msg_container"><div id="yiv4026505323"><div><div>Hank,</div><div>so their is no taper or key to hold the epoxy,</div><div>just a standard tube threaded on the outside?</div><div>Alan<br clear="none"><br clear="none">Sent from my iPad</div><div class="yiv4026505323yqt7045028756" id="yiv4026505323yqt88378"><div><br clear="none">On 23/12/2013, at 5:25 AM, hank pronk <<a href="mailto:hanker_20032000@yahoo.ca" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);"><div><span>I just did a potting
experiment, I removed the main electric penetrator from my little yellow sub and pressure tested it to 1,000psi. I left it over night and it held 1,000psi with
no leaks. That penetrator is my standard simple threaded rod in poly urethane. I tried the same technique with 11 bare wires except I started with 5min epoxy for the first .75in just to seal it to hold the very slow curing poly urethane from leaking out. Well it failed at 1,000psi, I am not sure if is the small wire versus the larger threaded rod. More testing :-) </span></div><div><span>Hank </span></div><div class="yiv4026505323yahoo_quoted" style="display: block;"> <br clear="none"> <br clear="none"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> On Saturday, December 21, 2013 10:45:39 PM, Joe Perkel <<a href="mailto:josephperkel@yahoo.com" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:josephperkel@yahoo.com">josephperkel@yahoo.com</a>> wrote:<br clear="none"> </font> </div> <div class="yiv4026505323y_msg_container"><div id="yiv4026505323"><div><table border="0" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" rowspan="1" colspan="1">Jon,<br clear="none"><br clear="none">As a diver I would say depth. The reason being that in a blow and go scenario you need to know that last depth and time to blow down to know your bottom time for what would be hopefully, a controlled ascent. Think USN dive tables.<br clear="none"><br clear="none">This is a big reason why I think I personally would limit my own personal maximum operational depth to 250' with a practical use somewhat less. I might design for a 1,000', but I'm not
going there. I really don't think I would like to go any deeper than say something like the Andrea Doria in a homebuilt non certified sub. Conversely, I'd do Titanic in Alvin, Mir, or Nautile in a heartbeat if I got the chance.<br clear="none"><br clear="none">Pay close attention to that next 25 story building you stand next to and picture yourself ascending from street level to the roof line. You may need to stop at the 24th floor for a while, if you can control that last ten
feet that is.<br clear="none"><br clear="none">Joe<br clear="none"><br clear="none"><a href="http://overview.mail.yahoo.com/?.src=iOS" target="_blank" rel="nofollow" shape="rect"><br clear="none"><br clear="none">Sent from Yahoo Mail for iPad</a></td></tr></tbody></table> <div class="yiv4026505323yqt2429999367" id="yiv4026505323yqt65415"><div id="yiv4026505323_origMsg_">
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<b>
<span style="font-weight: bold;">From:</span>
</b>
Jon Wallace <<a href="mailto:jonw@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:jonw@psubs.org">jonw@psubs.org</a>>; <br clear="none">
<b>
<span style="font-weight: bold;">To:</span>
</b>
Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>; <br clear="none">
<b>
<span style="font-weight: bold;">Subject:</span>
</b>
[PSUBS-MAILIST] instruments, pressure display? <br clear="none">
<b>
<span style="font-weight: bold;">Sent:</span>
</b>
Sun, Dec 22, 2013 3:34:24 AM <br clear="none">
</div>
<br clear="none">
<table border="0" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" rowspan="1" colspan="1"><br clear="none">I will be displaying depth in feet. Is there any practical reason to <br clear="none">also display pressure? It's easy enough for me to do so but it seems <br clear="none">superfluous. Which do you prefer, depth indicator or pressure <br clear="none">indicator, and why?<br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="" rel="nofollow" shape="rect">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></td></tr></tbody></table>
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