<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><span></span></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div><span></span></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div>Sorry fat fingers on sensitive ipad, fired email too soon.</div><div id="AppleMailSignature">Also in the equation may be being towed; where noise from boat motors</div><div id="AppleMailSignature">& distractions, plus glare on the screen may hinder any warnings from being observed.</div><div id="AppleMailSignature"> The fact that you can die without warning from scrubbing out the C02 while </div><div id="AppleMailSignature">neglecting to turn on the O2, has me worried. I believe that is why Kiteridge designed</div><div id="AppleMailSignature">the K250 without a life support system.</div><div id="AppleMailSignature"> You could design the electronics so that the O2 system wouldn't fail if the seat</div><div id="AppleMailSignature">switch failed while diving. Have a switch activated by the main ballast valves to</div><div id="AppleMailSignature">form another current path to the O2 add solenoid.</div><div id="AppleMailSignature">There would be two functions, the auto function where the solenoid automatically</div><div id="AppleMailSignature">adds air when the operator was seated & the hatch down; this normally is a top</div><div id="AppleMailSignature">up system but can supply all the required O2. The second function is turning</div><div id="AppleMailSignature">on the valve to the O2 flow meter. So there is a hull stop valve which remains open,</div><div id="AppleMailSignature">a tee to the solenoid add system & a valve on the O2 flow meter which is part of</div><div id="AppleMailSignature">the check list. Of course there would be normal low O2 warnings.</div><div id="AppleMailSignature"> Re the seat switch; I had a friend that always wanted a ride on mower. He bought</div><div id="AppleMailSignature">one when in the later stages of cancer & wasn't heavy enough to trigger the switch.</div><div id="AppleMailSignature">So light springs for light pilots.</div><div id="AppleMailSignature">Cheers Alan</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 3/07/2017, at 1:32 AM, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div>Alan, while you have the hatch interlock to protect from trying to dive the boat if hatch is open or if O2 and Air pressures are low, I would be a bit worried about a pilot weight switch tied to a solenoid on any part of the O2 supply (O2 supply interlock). This would be a NC solenoid valve so what happens if you loose power, your O2 to the boat would be offline if this valve was in the main supply line. You would need a manual O2 override to be able to bypass this valve and have O2 makeup when all power is off. </div><div><br></div><div>With the intent of letting someone else pilot the one man boat, I think you can handle issues like O2 and air supply valve state by having a series of checklist the pilot performs with the surface coordinator . If you have these checklist go through the PLC and HMI, then they can also act as interlock to prevent the novice pilot from diving the boat if any of these major systems are compromised. On my boat, I have such a system. </div><div><br></div><div>I kind of like the idea of the PLC knowing if a pilot is in the boat in addition to the hatch state but just not for O2 supply interlock. I need to chew on this pilot weight interlock idea to see what benefit it could bring my boat.</div><div><br></div><div>Best regards</div><div><br></div><div>Cliff </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jul 2, 2017 at 12:47 AM, Alan via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div><span></span></div><div><div>Cliff, ( or anyone)</div><div id="m_-7327011104335213851AppleMailSignature">I was thinking of ways of making my one person sub idiot proof with </div><div id="m_-7327011104335213851AppleMailSignature">regard to the turning on of the O2 supply. If I let anybody dive it I won't</div><div id="m_-7327011104335213851AppleMailSignature">be in there to oversee.</div><div id="m_-7327011104335213851AppleMailSignature">My ideas are to have a switch under the seat ( as they have on ride on lawn</div><div id="m_-7327011104335213851AppleMailSignature">mowers) & a hatch closure switch ( which is required by G.L. ) linked to</div><div id="m_-7327011104335213851AppleMailSignature">the O2 system so that when both switches are closed ( pilot seated &</div><div id="m_-7327011104335213851AppleMailSignature">hatch closed) the O2 feed system is activated. This will be the solenoid top</div><div id="m_-7327011104335213851AppleMailSignature">up part of the O2 system. A sign & maybe audible voice will say " Turn on Oxygen</div><div id="m_-7327011104335213851AppleMailSignature">valve". So the system will be like the DW O2 add system where there is a </div><div id="m_-7327011104335213851AppleMailSignature">minimal amount of O2 constantly flowing but the balance flows in from a solenoid</div><div id="m_-7327011104335213851AppleMailSignature">valve activated by O2 level readings.</div><div id="m_-7327011104335213851AppleMailSignature">The CO2 scrubber could also be linked.</div><div id="m_-7327011104335213851AppleMailSignature">Any thoughts on this?</div><div id="m_-7327011104335213851AppleMailSignature">Thanks Alan</div><div id="m_-7327011104335213851AppleMailSignature"><br></div><div id="m_-7327011104335213851AppleMailSignature"> </div><div id="m_-7327011104335213851AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 2/07/2017, at 1:13 PM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:rgb(0,0,0);font-family:Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:13px;background-color:rgb(255,255,255)"><div><span>Cliff,</span></div><div id="m_-7327011104335213851yui_3_16_0_ym19_1_1498957842693_3160" dir="ltr"><span id="m_-7327011104335213851yui_3_16_0_ym19_1_1498957842693_3187">That is exactly what I did, I put the tank specs in the unstiffened cylinder program. The only problem is, I can not findways of the exact material the steel tanks are made from. I am assuming same steel and gives a good estimate.</span></div><div id="m_-7327011104335213851yui_3_16_0_ym19_1_1498957842693_3160" dir="ltr"><span>Thanks Cliff</span></div><div id="m_-7327011104335213851yui_3_16_0_ym19_1_1498957842693_3160" dir="ltr"><span>Hank</span></div> <div class="m_-7327011104335213851qtdSeparateBR"><br><br></div><div class="m_-7327011104335213851yahoo_quoted" style="display:block"> <div style="font-family:Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:13px"> <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 Saturday, July 1, 2017 6:05 PM, via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:<br></font></div> <br><br> <div class="m_-7327011104335213851y_msg_container"><div id="m_-7327011104335213851yiv2484074644"><div><div>Most of the FEA packages associated with 3-d modeling software use a linear model. You would need an FEA tool that can model buckling to study this. An alternative is to use the ABS stress analysis spreadsheet with no stiffeners. This would give a conserative crush depth.</div><div id="m_-7327011104335213851yiv2484074644AppleMailSignature"><br clear="none"></div><div id="m_-7327011104335213851yiv2484074644AppleMailSignature">Cliff</div><div id="m_-7327011104335213851yiv2484074644AppleMailSignature"><br clear="none"><br clear="none"><div>Cliff Redus</div></div><div><div class="m_-7327011104335213851yiv2484074644yqt7986811274" id="m_-7327011104335213851yiv2484074644yqtfd49964"><br clear="none">On Jul 1, 2017, at 2:27 PM, Scott Waters via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect">personal_submersibles@psubs.<wbr>org</a>> wrote:<br clear="none"><br clear="none"></div></div><div class="m_-7327011104335213851yiv2484074644yqt7986811274" id="m_-7327011104335213851yiv2484074644yqtfd18492"><blockquote type="cite"><div></div></blockquote></div></div><div class="m_-7327011104335213851yiv2484074644yqt7986811274" id="m_-7327011104335213851yiv2484074644yqtfd57664"><div><div>I am unsure of the depth rating of an empty scuba tank. It could be easily found out on a solidworks simulation.</div><div>Thanks,</div><div>Scott</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div id="m_-7327011104335213851yiv2484074644composer_signature"><div style="color:rgb(87,87,87);font-size:85%">Sent from my U.S. Cellular® Smartphone</div></div><div><br clear="none"></div><div style="color:rgb(0,0,0);font-size:100%"><div>-------- Original message --------</div><div>From: hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect">personal_submersibles@psubs.<wbr>org</a>> </div><div>Date: 7/1/17 12:34 PM (GMT-05:00) </div><div>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect">personal_submersibles@psubs.<wbr>org</a>> </div><div>Subject: Re: [PSUBS-MAILIST] O2 tanks </div><div><br clear="none"></div></div>Thanks' Scott,Do you know what the max depth rating for an empty Scuba O2 tank is. I suppose you could increase the rating by using only part of the volume and leave pressure inside them. A sub could carry several in that case since they are close to neutral buoyant. Hank <br clear="none"><br clear="none"> On Saturday, July 1, 2017 8:25 AM, Scott Waters via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect">personal_submersibles@psubs.<wbr>org</a>> wrote:<br clear="none"> <br clear="none"><br clear="none"> Hank,Alvin has all the O2 supply internally. Pisces has the mission O2 internally and emergency supply externally in special steel cylinders that are pressure tested to 1.25 max depth while empty.Thanks,Scott Waters<br clear="none"><br clear="none"><br clear="none">Sent from my U.S. Cellular® Smartphone<br clear="none">-------- Original message --------From: hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect">personal_submersibles@psubs.<wbr>org</a>> Date: 7/1/17 9:59 AM (GMT-05:00) To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect">personal_submersibles@psubs.<wbr>org</a>> Su<blockquote type="cite"><div><span>______________________________<wbr>_________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect">Personal_Submersibles@psubs.<wbr>org</a></span><br clear="none"><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a></span><br clear="none"></div></blockquote></div></div></div><div class="m_-7327011104335213851yqt7986811274" id="m_-7327011104335213851yqtfd52174">______________________________<wbr>_________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" target="_blank" shape="rect">Personal_Submersibles@psubs.<wbr>org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" shape="rect">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></div></blockquote><blockquote type="cite"><div><span>______________________________<wbr>_________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a></span><br></div></blockquote></div></div><br>______________________________<wbr>_________________<br>
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