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<div dir="ltr" data-setdir="false">Good to hear from you Hugh. I like the idea of populating a PSubs scrubber parameter spreadsheet. Some of the parameters that need to be included are:</div></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;"><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in">Number of occupants</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in">Mass of CO2 absorbent in Scrubber</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in">Radial or Axial flow through absorbent</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in">Scrubber dimensions</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in">Blower head curve</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in">Blower current</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in">Blower power</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in">Blower voltage</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in" dir="ltr" data-setdir="false">Blower efficiency at the design flowrate</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in" dir="ltr" data-setdir="false">Absorbent supplier</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in" dir="ltr" data-setdir="false">Absorbent part number</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in" dir="ltr" data-setdir="false">Turnover time (cabin volume /volumetric
flow rate through scrubber)</div></div></div></div><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><div><div style="margin-bottom:0in">Absorption capacity (weight %)</div></div></div></div></blockquote><div class="ydpd779c74eyahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">As for testing, I am a big believer in shop dives while logging cabin environment (pressure, temperature, relative humidity, CO2 ppm and O2 %).</div><div dir="ltr" data-setdir="false">Scrubber performance is a function of not only the pellet size but also RH and cabin temperature. You can do a number of these life support test dives with different objectives like the scrubber's ability to meet ABS <5000 ppm rule, how long it takes to reach saturation of absorbent, and how long before you reach 5000 ppm if your blower is turned off. You can also measure hotel electrical load to determine if your auxiliary battery can meet the ABS 72-hour rule. I used these shop dives to fine-tune my life support system going through several different blowers until I found that worked the best for my boat.</div><div dir="ltr" data-setdir="false"> </div><div dir="ltr" data-setdir="false">If you do these shop dives, an important safety requirement is of course to have someone monitor the test/occupant.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Cliff</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"> </div><div><br></div>
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On Friday, March 22, 2024 at 05:34:39 PM CDT, via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div dir="ltr">Hi Cliff et al,<br></div><div dir="ltr">Many thanks for sharing your fan recommendation. I have googled Cliffs<br></div><div dir="ltr">blower and got the fan curve/data to compare it with mine. The one I<br></div><div dir="ltr">selected is about double the power and as it is a computer forward curve<br></div><div dir="ltr">blower it can go up to 1" of water gauge. Cliff's design appears to have<br></div><div dir="ltr">its best efficiency area around 1/4" water gauge with a max of about 1/2".<br></div><div dir="ltr">The one I have is for a 2 person sub but it is untested. What I mean is that<br></div><div dir="ltr">we do not know the performance of the soda lime bed. I had a good look at<br></div><div dir="ltr">the design of the late Phil Nuyten, before designing mine and learned a bit<br></div><div dir="ltr">from that. His design appears to be a short air travel of approx. 2-3"<br></div><div dir="ltr">depending on where to measure. What is the dwell time for yours, Cliff?<br></div><div dir="ltr"><br></div><div dir="ltr">I think that it is great that Jon is doing the design from scratch but in<br></div><div dir="ltr">order to do the project it would be great if we could do a spreadsheet for<br></div><div dir="ltr">comparison of the different designs. Cliff, as usual, has included the<br></div><div dir="ltr">obvious and in this case I would like to review mine in relation to the<br></div><div dir="ltr">amount of power used for the duration of the ABS required 72 hrs. I am<br></div><div dir="ltr">aiming for 96 hrs but happy for 72 hrs.<br></div><div dir="ltr"><br></div><div dir="ltr">Jon, where can we download/upload a spreadsheet and drawings / photos etc<br></div><div dir="ltr">to assist the project? One of the aspects is to determine what sphere size<br></div><div dir="ltr">is being used and then what resistance at various flow rates of air per sq<br></div><div dir="ltr">ft or per 100 mm square (100 sq cm) . I am proposing testing using a flow<br></div><div dir="ltr">meter of CO2 into a chamber and the maintainable CO2 level achieved. An<br></div><div dir="ltr">airtight box of 1-2 cu metres is a suggestion but ideally a tank of a known<br></div><div dir="ltr">volume. Somewhere there is a recommendation of how many air changes/hour is<br></div><div dir="ltr">best. I need to retrieve the data I used when designing mine but you guys<br></div><div dir="ltr">will be more current.<br></div><div dir="ltr">I am not a user of FB, Tiktok etc and try and confine my file transfer to<br></div><div dir="ltr">email attachments. Cheers, Hugh.<br></div><div dir="ltr"><br></div><div dir="ltr">---Original Message-----<br></div><div dir="ltr">From: Personal_Submersibles <<a href="mailto:personal_submersibles-bounces@psubs.org" rel="nofollow" target="_blank">personal_submersibles-bounces@psubs.org</a>> On<br></div><div dir="ltr">Behalf Of via Personal_Submersibles<br></div><div dir="ltr">Sent: Friday, March 22, 2024 1:56 AM<br></div><div dir="ltr">To: <a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a><br></div><div dir="ltr">Subject: Personal_Submersibles Digest, Vol 127, Issue 31<br></div><div dir="ltr"><br></div><div dir="ltr">Send Personal_Submersibles mailing list submissions to<br></div><div dir="ltr"> <a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">To subscribe or unsubscribe via the World Wide Web, visit<br></div><div dir="ltr"> <a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr">or, via email, send a message with subject or body 'help' to<br></div><div dir="ltr"> <a href="mailto:personal_submersibles-request@psubs.org" rel="nofollow" target="_blank">personal_submersibles-request@psubs.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">You can reach the person managing the list at<br></div><div dir="ltr"> <a href="mailto:personal_submersibles-owner@psubs.org" rel="nofollow" target="_blank">personal_submersibles-owner@psubs.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">When replying, please edit your Subject line so it is more specific than<br></div><div dir="ltr">"Re: Contents of Personal_Submersibles digest..."<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">Today's Topics:<br></div><div dir="ltr"><br></div><div dir="ltr"> 1. Re: CO2 scrubber BOM or documentation (via Personal_Submersibles)<br></div><div dir="ltr"> 2. Re: CO2 scrubber BOM or documentation<br></div><div dir="ltr"> (Cliff Redus via Personal_Submersibles)<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">----------------------------------------------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 1<br></div><div dir="ltr">Date: Thu, 21 Mar 2024 11:02:09 +0100<br></div><div dir="ltr">From: via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">To: "'Personal Submersibles General Discussion'"<br></div><div dir="ltr"> <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">Subject: Re: [PSUBS-MAILIST] CO2 scrubber BOM or documentation<br></div><div dir="ltr">Message-ID: <026501da7b76$d67f5f40$837e1dc0$@airesearch.nl><br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"<br></div><div dir="ltr"><br></div><div dir="ltr">Hi Cliff, <br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">It is a Radial blower right? These ones create a higher pressure than axial<br></div><div dir="ltr">blowers. <br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">Br, Emile<br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">Van: Personal_Submersibles <<a href="mailto:personal_submersibles-bounces@psubs.org" rel="nofollow" target="_blank">personal_submersibles-bounces@psubs.org</a>> Namens<br></div><div dir="ltr">Cliff Redus via Personal_Submersibles<br></div><div dir="ltr">Verzonden: donderdag 21 maart 2024 00:17<br></div><div dir="ltr">Aan: Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">Onderwerp: Re: [PSUBS-MAILIST] CO2 scrubber BOM or documentation<br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">Jon, see the attached drawing of the scrubber I will be using on the R400.<br></div><div dir="ltr">It is essentially the same configuration I use on the R300. I have had good<br></div><div dir="ltr">luck with the Rapst RL90-18/24 Fan Blower. These come up on eBay often.<br></div><div dir="ltr">You can get this used on eBay for $39 now. These are good German-engineered<br></div><div dir="ltr">blowers that seem to strike a balance between adequate head, and not to much<br></div><div dir="ltr">current draw so that you can meet the 72-hour ABS rule and they are quiet.<br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">System Papst RL90-18/24 Chassis Fan Blower | eBay<br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">Cliff<br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">On Wednesday, March 20, 2024 at 01:21:01 PM CDT, Jon Wallace via<br></div><div dir="ltr">Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a><br></div><div dir="ltr"><mailto:personal_submersibles@psubs.org> > wrote: <br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">Hey guys, I'm in the initial thought processes of CO2 scrubber design and<br></div><div dir="ltr">really don't want to reinvent the wheel on this component. Are any of you<br></div><div dir="ltr">willing to share some details on your design? I know Alec submitted a 3D<br></div><div dir="ltr">printer design which we have on the website however I don't have access to a<br></div><div dir="ltr">3D printer and frankly even though I've spent 40+ years in software<br></div><div dir="ltr">development and can modify a UNIX kernel, my CAD skills are pretty much<br></div><div dir="ltr">non-existent.<br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">For this component I'd really like something that can be built with as many<br></div><div dir="ltr">off the shelf parts as possible. Any suggestions?<br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr">Jon<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a> <mailto:Personal_Submersibles@psubs.org><br></div><div dir="ltr"><a 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></div><div dir="ltr"><br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL:<br></div><div dir="ltr"><<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20240321/" rel="nofollow" target="_blank">http://www.whoweb.com/pipermail/personal_submersibles/attachments/20240321/</a><br></div><div dir="ltr">34be80ce/attachment-0001.html><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 2<br></div><div dir="ltr">Date: Thu, 21 Mar 2024 12:55:47 +0000 (UTC)<br></div><div dir="ltr">From: Cliff Redus via Personal_Submersibles<br></div><div dir="ltr"> <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">To: via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">Subject: Re: [PSUBS-MAILIST] CO2 scrubber BOM or documentation<br></div><div dir="ltr">Message-ID: <<a href="mailto:1307222564.7713199.1711025747944@mail.yahoo.com" rel="nofollow" target="_blank">1307222564.7713199.1711025747944@mail.yahoo.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"<br></div><div dir="ltr"><br></div><div dir="ltr"> Yes Emile, this is a radial blower. The direction of flow in axial intake<br></div><div dir="ltr">but radial centrifugal exhaust.??Some people refer to these as squirrel gage<br></div><div dir="ltr">blowers.?I was looking at my files and can't put my fingers on the datasheet<br></div><div dir="ltr">for this blower but see Papst RL90-18/14N which is a newer version of this<br></div><div dir="ltr">blower.??https://www.onlinecomponents.com/en/datasheet/rl901814n-12103307/<br></div><div dir="ltr">Cliff<br></div><div dir="ltr"><br></div><div dir="ltr"> On Thursday, March 21, 2024 at 05:02:51 AM CDT, via<br></div><div dir="ltr">Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote: <br></div><div dir="ltr"> <br></div><div dir="ltr"> <br></div><div dir="ltr">Hi Cliff, <br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">It is a Radial blower right? These ones create a higher pressure than axial<br></div><div dir="ltr">blowers. <br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">Br, Emile<br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">Van: Personal_Submersibles <<a href="mailto:personal_submersibles-bounces@psubs.org" rel="nofollow" target="_blank">personal_submersibles-bounces@psubs.org</a>> Namens<br></div><div dir="ltr">Cliff Redus via Personal_Submersibles<br></div><div dir="ltr">Verzonden: donderdag 21 maart 2024 00:17<br></div><div dir="ltr">Aan: Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>><br></div><div dir="ltr">Onderwerp: Re: [PSUBS-MAILIST] CO2 scrubber BOM or documentation<br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">Jon, see the attached drawing of the scrubber I will be using on the R400.<br></div><div dir="ltr">It is essentially the same configuration I use on the R300.? I have had good<br></div><div dir="ltr">luck with the Rapst RL90-18/24 Fan Blower.? These come up on eBay often.?<br></div><div dir="ltr">You can get this used on eBay for $39 now.? These are good German-engineered<br></div><div dir="ltr">blowers that seem to strike a balance between adequate head, and not to much<br></div><div dir="ltr">current draw so that you can meet the 72-hour ABS rule and they are quiet.<br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">System Papst RL90-18/24 Chassis Fan Blower | eBay<br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">Cliff<br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">On Wednesday, March 20, 2024 at 01:21:01 PM CDT, Jon Wallace via<br></div><div dir="ltr">Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote: <br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">Hey guys, I'm in the initial thought processes of CO2 scrubber design and<br></div><div dir="ltr">really don't want to reinvent the wheel on this component.? Are any of you<br></div><div dir="ltr">willing to share some details on your design?? I know Alec submitted a 3D<br></div><div dir="ltr">printer design which we have on the website however I don't have access to a<br></div><div dir="ltr">3D printer and frankly even though I've spent 40+ years in software<br></div><div dir="ltr">development and can modify a UNIX kernel, my CAD skills are pretty much<br></div><div dir="ltr">non-existent.<br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">For this component I'd really like something that can be built with as many<br></div><div dir="ltr">off the shelf parts as possible.? Any suggestions?<br></div><div dir="ltr"><br></div><div dir="ltr"> ?<br></div><div dir="ltr"><br></div><div dir="ltr">Jon<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a 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></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a 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></div><div dir="ltr"> <br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL:<br></div><div dir="ltr"><<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20240321/" rel="nofollow" target="_blank">http://www.whoweb.com/pipermail/personal_submersibles/attachments/20240321/</a><br></div><div dir="ltr">a1eec5b8/attachment.html><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Subject: Digest Footer<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">End of Personal_Submersibles Digest, Vol 127, Issue 31<br></div><div dir="ltr">******************************************************<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a 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></div></div>
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