<div dir="ltr"><div>Alan,<br></div>Commercial airliners use air as the working fluid in their refrigeration and air conditioning systems. Having a noxious chemical refrigerant leak into an enclosed space doesn't seem too appealing to me. I can't say I've browsed the section on air conditioning in ABS or GL, but prohibition of onboard refrigerant wouldn't surprise me.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Aug 9, 2017 at 10:00 PM, 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">Send Personal_Submersibles mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Re: Personal_Submersibles Digest, Vol 50, Issue 19<br>
(Marc de Piolenc via Personal_Submersibles)<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>----------<br>
<br>
Message: 1<br>
Date: Thu, 10 Aug 2017 10:01:02 +0800<br>
From: Marc de Piolenc via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
Subject: Re: [PSUBS-MAILIST] Personal_Submersibles Digest, Vol 50,<br>
Issue 19<br>
Message-ID: <<a href="mailto:53ff605b-589f-255d-1a5a-f13ab724c7e2@archivale.com">53ff605b-589f-255d-1a5a-<wbr>f13ab724c7e2@archivale.com</a>><br>
Content-Type: text/plain; charset=utf-8; format=flowed<br>
<br>
Right - that will work fine with a metal hull!<br>
<br>
Best,<br>
Marc<br>
<br>
On 8/10/2017 9:33 AM, Alan via Personal_Submersibles wrote:<br>
> Mark,<br>
> you don't need any through hulls, just glue them on to your hull with<br>
> a heat transfer compound. The heat will go through the hull to the surrounding<br>
> water but will also radiate laterally through the metal; hence my suggestion<br>
> to insulate around the area a bit so that the cold or heat can't come back in to<br>
> the hull.<br>
> Alan<br>
><br>
> Sent from my iPad<br>
><br>
>> On 10/08/2017, at 1:19 PM, Marc de Piolenc via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
>><br>
>> Peltier modules ARE more efficient than resistive heaters because they are true heat pumps - they don't supply (all) the heat that they emit on the hot side. In fact, they are more efficient as heaters than as coolers. That said, using them is a lot more difficult than using resistors, because they have to be connected on one side to a heat source and on the other to the area you want heated. In a sub, that sounds like you need another penetration in your pressure hull, which I would not be interested in if it were mine.<br>
>><br>
>> Marc<br>
>><br>
>>> On 8/10/2017 8:14 AM, Stephen Fordyce via Personal_Submersibles wrote:<br>
>>> Hi Alan,<br>
>>> Resistive heating being about as close as you can get to 100%, I would be sceptical about that. I've experimented with Peltier modules for gas cooling and they were quite disappointing in performance, although wonderfully simple in operation.<br>
>>> Cheers,<br>
>>> Steve<br>
>>> On 10 Aug 2017 8:33 am, "Alan via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>> wrote:<br>
>>> Just did some Googling on the Peltier as a heater.<br>
>>> In an experiment I saw it was more efficient than resistive heating!<br>
>>> This depends to an extent on the ambient heat differential.<br>
>>> I would imagine you would need to attach them to the hull & surround<br>
>>> them<br>
>>> with an insulating material to stop the metal of the hull radiating back<br>
>>> the cold or heat produced, & force it to transfer it all to the water.<br>
>>> Another bunny trail to investigate.<br>
>>> Cheers Alan<br>
>>> Sent from my iPad<br>
>>> On 10/08/2017, at 9:18 AM, Alan via Personal_Submersibles<br>
>>> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>> wrote:<br>
>>>> Mike,<br>
>>>> the peltier is only 1/4 to 1/3 as efficient as a compressor<br>
>>>> system, but Cliff<br>
>>>> & I have very little spare room. They serve as heaters by<br>
>>>> reversing polarity.<br>
>>>> I am not sure of their efficiency as heaters compared with<br>
>>>> resistive coils;<br>
>>>> probably poor! Cliff would have to cut a hole in his fibreglass<br>
>>>> outer & dig back<br>
>>>> the syntactic foam to the pressure hull to get cooling on the<br>
>>>> reverse side of<br>
>>>> the peltier or compressor air conditioning unit. Could look sexy<br>
>>>> if he put some<br>
>>>> shark gills in it for water ingress.<br>
>>>> Cliff didn't have a cover on the dome, & that would let a lot of<br>
>>>> heat in.<br>
>>>> We had a wet towel on Snoopy last time at Islamorada.<br>
>>>> Have heard that people like Nuytco use a shore based air<br>
>>>> conditioner to cool<br>
>>>> the sub down prior to a dive; but I don't know how long that<br>
>>>> benefit would<br>
>>>> last being towed out that distance.<br>
>>>> Cheers Alan<br>
>>>><br>
>>>><br>
>>>> Sent from my iPad<br>
>>>><br>
>>>> On 10/08/2017, at 6:25 AM, peaceroom via Personal_Submersibles<br>
>>>> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>> wrote:<br>
>>>><br>
>>>>> Reference,summer submarine cooling. A scaled down version of the<br>
>>>>> small cooler with ice and DC fan, similar to the one in Sportys,<br>
>>>>> aviation supplies is what a lot of planes use. Just an<br>
>>>>> inexpensive idea. Peltier coolers provide very little cooling<br>
>>>>> versus DC current used. Mike Patterson<br>
>>>>><br>
>>>>><br>
>>>>><br>
>>>>> Sent from my Samsung device<br>
>>>>><br>
>>>>><br>
>>>>> -------- Original message --------<br>
>>>>> From: via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>><br>
>>>>> Date: 8/9/17 11:46 AM (GMT-05:00)<br>
>>>>> To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>><br>
>>>>> Subject: Personal_Submersibles Digest, Vol 50, Issue 19<br>
>>>>><br>
>>>>> Send Personal_Submersibles mailing list submissions to<br>
>>>>> <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>><br>
>>>>><br>
>>>>> To subscribe or unsubscribe via the World Wide Web, visit<br>
>>>>> <a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.whoweb.com/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
>>>>> <<a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.whoweb.com/<wbr>mailman/listinfo.cgi/personal_<wbr>submersibles</a>><br>
>>>>> or, via email, send a message with subject or body 'help' to<br>
>>>>> <a href="mailto:personal_submersibles-request@psubs.org">personal_submersibles-request@<wbr>psubs.org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles-request@psubs.org">personal_submersibles-<wbr>request@psubs.org</a>><br>
>>>>><br>
>>>>> You can reach the person managing the list at<br>
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>>>>><br>
>>>>> When replying, please edit your Subject line so it is more specific<br>
>>>>> than "Re: Contents of Personal_Submersibles digest..."<br>
>>>>><br>
>>>>><br>
>>>>> Today's Topics:<br>
>>>>><br>
>>>>> 1. Re: Islamorada Trip Report...<br>
>>>>> (Cliff Redus via Personal_Submersibles)<br>
>>>>> 2. Re: Islamorada Trip Report...<br>
>>>>> (james cottrell via Personal_Submersibles)<br>
>>>>><br>
>>>>><br>
>>>>> ------------------------------<wbr>------------------------------<wbr>----------<br>
>>>>><br>
>>>>> Message: 1<br>
>>>>> Date: Wed, 9 Aug 2017 08:03:07 -0500<br>
>>>>> From: Cliff Redus via Personal_Submersibles<br>
>>>>> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>><br>
>>>>> To: Personal Submersibles General Discussion<br>
>>>>> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>><br>
>>>>> Subject: Re: [PSUBS-MAILIST] Islamorada Trip Report...<br>
>>>>> Message-ID:<br>
>>>>> <CAK4DN4DuhY87_6v+19RNb-<wbr>6x2d9fKdaCW1uND2psz=<a href="mailto:ncVoQ9cg@mail.gmail.com">ncVoQ9cg@<wbr>mail.gmail.com</a><br>
>>>>> <mailto:<a href="mailto:CAK4DN4DuhY87_6v%2B19RNb-6x2d9fKdaCW1uND2psz">CAK4DN4DuhY87_6v+<wbr>19RNb-6x2d9fKdaCW1uND2psz</a>=<a href="mailto:ncVoQ9cg@mail.gmail.com">ncVo<wbr>Q9cg@mail.gmail.com</a>>><br>
>>>>> Content-Type: text/plain; charset="utf-8"<br>
>>>>><br>
>>>>> Footage from my sub on the trip is limited due to condensation on<br>
>>>>> viewport. I used Dove soap on the viewport interior prior to<br>
>>>>> taking off<br>
>>>>> but because of the humidity , temperature and duration of the<br>
>>>>> dive, this<br>
>>>>> treatment did not last and I did not have more soap on board. The other<br>
>>>>> issue is I only had two hand towels on board and these became<br>
>>>>> soaked with<br>
>>>>> sweat. As such, they were not good for cleaning the condensation<br>
>>>>> off after<br>
>>>>> the two hour tow to the dive site. Action items: Have small<br>
>>>>> bottle of<br>
>>>>> Dove soap on board and more towels for future long duration dives.<br>
>>>>><br>
>>>>> Yes, I have been reading up on peltier coolers. I have quite a<br>
>>>>> bit of<br>
>>>>> battery capacity so this could work. Unfortunately, mounting on<br>
>>>>> hull won't<br>
>>>>> work for me as I have syntactic foam under the FRP shell over the<br>
>>>>> hull so I<br>
>>>>> don't have a cool surface to mount on. I do have a pair of<br>
>>>>> plugged off<br>
>>>>> ports on the bottom of the boat that would give me access to<br>
>>>>> cooling water<br>
>>>>> source if I installed a small pump on this circuit. Pushing this<br>
>>>>> water<br>
>>>>> through a small fin-fan cooler like you would see on water cooled<br>
>>>>> motorcycle would help with the temperature some what but not<br>
>>>>> humidity. At<br>
>>>>> Islamorada, the average water temperature at the time of the dive<br>
>>>>> was about<br>
>>>>> 87F so this would not have helped all that much. A small DC AC<br>
>>>>> system that<br>
>>>>> controlled both temperature and humidity would be better.<br>
>>>>><br>
>>>>> On the thruster pneumatic pressure compensation, I was very happy<br>
>>>>> with how<br>
>>>>> this worked. I have all four of my thrusters connected to 1/4"<br>
>>>>> SS tubing<br>
>>>>> that is manifold into a single pressure reducing/relieving regulator<br>
>>>>> (thanks Hugh) under the cover just aft of the pilot. I was not<br>
>>>>> sure if a<br>
>>>>> single regulator would work or if I would need one for each<br>
>>>>> thruster but it<br>
>>>>> looks like one was adequate. I have had two deep dives with the<br>
>>>>> arrangement, one to 155 ft and one to 100 ft and have had no<br>
>>>>> issues with<br>
>>>>> water in the thrusters.<br>
>>>>><br>
>>>>> Best Regards<br>
>>>>><br>
>>>>> Cliff<br>
>>>>><br>
>>>>> On Tue, Aug 8, 2017 at 10:50 PM, Alan via Personal_Submersibles <<br>
>>>>> <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>> wrote:<br>
>>>>><br>
>>>>> > Thanks Cliff,<br>
>>>>> > I presume you shot some footage from your sub & this is the entr?e!<br>
>>>>> > Nice & clear, you must have been pretty happy down there!<br>
>>>>> > After you mentioned air conditioning, I looked into peltier<br>
>>>>> elements &<br>
>>>>> > air conditioning units. The peltier conditioners have only 25% the<br>
>>>>> > efficiency<br>
>>>>> > of a normal compression cycle system, but are really small & by<br>
>>>>> reversing<br>
>>>>> > the polarity can act as heaters. A few of those peltier<br>
>>>>> elements stuck to<br>
>>>>> > the hull<br>
>>>>> > with air channelled past them might be the way to go! Not sure what<br>
>>>>> > batteries you<br>
>>>>> > are using, but the new battery technologies on the way will<br>
>>>>> make energy<br>
>>>>> > expenditure less of an issue!<br>
>>>>> > Do you have all 4 motors exhausting through one regulator?<br>
>>>>> Couldn't see<br>
>>>>> > any<br>
>>>>> > air coming out of the motor seals so the pressure isn't<br>
>>>>> building up too<br>
>>>>> > much<br>
>>>>> > when exhausting.<br>
>>>>> > Cheers Alan<br>
>>>>> ><br>
>>>>> ><br>
>>>>> ><br>
>>>>> > Sent from my iPad<br>
>>>>> ><br>
>>>>> > On 9/08/2017, at 8:25 AM, Cliff Redus via Personal_Submersibles <<br>
>>>>> > <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>> wrote:<br>
>>>>> ><br>
>>>>> > Added two quick and dirty Youtube videos from 2017 Psubs<br>
>>>>> Regatta. The<br>
>>>>> > first is the 100 ft dive 5.3 miles offshore on Aug 3<br>
>>>>> > <a href="https://www.youtube.com/watch?v=sHqL49V0lMw" rel="noreferrer" target="_blank">https://www.youtube.com/watch?<wbr>v=sHqL49V0lMw</a><br>
>>>>> <<a href="https://www.youtube.com/watch?v=sHqL49V0lMw" rel="noreferrer" target="_blank">https://www.youtube.com/<wbr>watch?v=sHqL49V0lMw</a>> and the second is a<br>
>>>>> night<br>
>>>>> > dive in front of Doug's house<br>
>>>>> <a href="https://www.youtube.com/watch?v=KDBw1ZOdKaI" rel="noreferrer" target="_blank">https://www.youtube.com/watch?<wbr>v=KDBw1ZOdKaI</a><br>
>>>>> <<a href="https://www.youtube.com/watch?v=KDBw1ZOdKaI" rel="noreferrer" target="_blank">https://www.youtube.com/<wbr>watch?v=KDBw1ZOdKaI</a>>.<br>
>>>>> > Alec is working on a more comprehensive video of the Regatta.<br>
>>>>> ><br>
>>>>> > Regards<br>
>>>>> ><br>
>>>>> > Cliff<br>
>>>>> ><br>
>>>>> > On Mon, Aug 7, 2017 at 4:53 PM, Douglas Suhr via<br>
>>>>> Personal_Submersibles <<br>
>>>>> > <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>> wrote:<br>
>>>>> ><br>
>>>>> >> Greetings PSUBS group, Douglas Suhr here to share my take on<br>
>>>>> the 4-day<br>
>>>>> >> sub operation we just completed in Islamorada, FL (July 31st,<br>
>>>>> August<br>
>>>>> >> 1-3).<br>
>>>>> >><br>
>>>>> >> Wow, what a whirlwind! So July 31st was really an arrival /<br>
>>>>> setup day<br>
>>>>> >> with August 1-3 being true operational days. Though it was<br>
>>>>> unfortunate<br>
>>>>> >> that Alec wasn't able to make it with Shackleton, we had our hands<br>
>>>>> >> full with Cliff's R-300. Without Shackleton, we also had<br>
>>>>> enough time<br>
>>>>> >> to get Snoopy set up and lowered into the canal for some basic<br>
>>>>> diving.<br>
>>>>> >><br>
>>>>> >> List of Crew: Dan Lance, Steve McQueen, Cliff Redus, Rick Maxwell,<br>
>>>>> >> River Dolfi, Mike Patterson, Doug, Sarah, Douglas Suhr.<br>
>>>>> >><br>
>>>>> >> This was my first time meeting Dan Lance, a (retired)<br>
>>>>> saturation diver<br>
>>>>> >> and commercial welder. What a pleasure to have him join us on this<br>
>>>>> >> operation. Dan is modest, but most willing to share his<br>
>>>>> knowledge and<br>
>>>>> >> extensive experience with a newbie like me. So pleased to have<br>
>>>>> chatted<br>
>>>>> >> with him in the Keys. During the towing of the R-300, Dan<br>
>>>>> manned the<br>
>>>>> >> tow line and helped with comms.<br>
>>>>> >><br>
>>>>> >> Steve McQueen and River Dolfi did awesome jobs as our frog men.<br>
>>>>> >> Filming, attaching / detaching davit and tow lines, etc. they were<br>
>>>>> >> both in and out of the water quite a bit (especially Steve). I<br>
>>>>> think<br>
>>>>> >> River took a little jelly sting for the team. What troopers!<br>
>>>>> >><br>
>>>>> >> Cliff and his assistant Rick are such a joy be around. Rick is<br>
>>>>> one of<br>
>>>>> >> the friendliest people you'll ever meet (and even brought a<br>
>>>>> gift for<br>
>>>>> >> the group: a watermelon, straight from Texas!). Cliff is always<br>
>>>>> >> willing to share his expertise (and sub, too) with anyone<br>
>>>>> who'd like<br>
>>>>> >> to learn more. I know that between Dan Lance and Cliff, I<br>
>>>>> learned more<br>
>>>>> >> than I can remember last week.<br>
>>>>> >><br>
>>>>> >> Mike Patterson, mom, dad and myself were all just providing<br>
>>>>> whatever<br>
>>>>> >> kind of "troop support" we could to Cliff and the R-300.<br>
>>>>> >><br>
>>>>> >> River, Steve and Myself got in some dive time on Snoopy in the<br>
>>>>> canal<br>
>>>>> >> (which was great), but I think the biggest accomplishment was<br>
>>>>> getting<br>
>>>>> >> the R-300 out a ways into the ocean.<br>
>>>>> >><br>
>>>>> >> Our Boston Whaler (a 25' boat with a single 250hp Yamaha) was<br>
>>>>> able to<br>
>>>>> >> tow the R-300 out about 5 miles into the ocean (at about 4mph). We<br>
>>>>> >> were in radio communication with Cliff most of the time,<br>
>>>>> though we did<br>
>>>>> >> suffer a few intermittent losses in comms. When we got to a<br>
>>>>> spot about<br>
>>>>> >> 100 feet deep, we started to slow down a bit and at that point<br>
>>>>> the tow<br>
>>>>> >> line hook (an admittedly cheap thing) let loose(!) so we<br>
>>>>> decided that<br>
>>>>> >> we had reached our dive location. We switched from marine<br>
>>>>> radio to OTS<br>
>>>>> >> and Cliff started down. Visibility was supurb! As Cliff neared the<br>
>>>>> >> bottom at 100 ? 110 feet, he was still quite visible from the<br>
>>>>> Whaler!<br>
>>>>> >> His 18 foot long R-300 looked to be about 3 inches long, but<br>
>>>>> wow did<br>
>>>>> >> it ever stand out from the rest of the sandy bottom. Cliff<br>
>>>>> spent about<br>
>>>>> >> an hour "flying" his sub, surfacing, diving and maneuvering about,<br>
>>>>> >> testing systems and observing the ocean around him. By the<br>
>>>>> time Cliff<br>
>>>>> >> surfaced and we towed back to port Antigua, elapsed time stood<br>
>>>>> at 4.5<br>
>>>>> >> / 5 hours (estimate). Cliff said that he stayed cool by the water<br>
>>>>> >> flowing over the sub's dome hatch while in tow. Upon returning<br>
>>>>> I think<br>
>>>>> >> we were all ready to take a break, but everyone felt great<br>
>>>>> >> accomplishment with the mission.<br>
>>>>> >><br>
>>>>> >> A couple of lessons I took away from the tow out: We need<br>
>>>>> better tow<br>
>>>>> >> equipment (better line, hardware and maybe a quick release).<br>
>>>>> Our boat<br>
>>>>> >> REALLY needs a GPS (still don't have one). Towing into waves<br>
>>>>> isn't so<br>
>>>>> >> much a problem, but when towing with the waves, our tow line<br>
>>>>> needs to<br>
>>>>> >> be measured so as to sustain the proper distance between tow<br>
>>>>> vessel<br>
>>>>> >> and sub (otherwise the sub and boat are constantly slacking<br>
>>>>> and then<br>
>>>>> >> jerking, stressing the tow line and making it difficult for<br>
>>>>> boat and<br>
>>>>> >> sub to track straight).<br>
>>>>> >><br>
>>>>> >> The devotion of our crew was amazing, even in the heat and the<br>
>>>>> waves<br>
>>>>> >> everyone did their jobs. Managing even a small sub operation<br>
>>>>> like this<br>
>>>>> >> is more work / effort than meets the eye, that's for sure. At<br>
>>>>> dinner,<br>
>>>>> >> one of the main discussions revolved around a support vessel<br>
>>>>> that can<br>
>>>>> >> carry a sub or two on board, eliminating the slow, time<br>
>>>>> consuming tow<br>
>>>>> >> out to an ocean dive site. Dan Lance shared details on his support<br>
>>>>> >> vessel project, which is no doubt going to be a dream in terms of<br>
>>>>> >> logistics. Hopefully when said vessel is ready to sail, Dan<br>
>>>>> will lend<br>
>>>>> >> its services to host a diving event! ~ Douglas S.<br>
>>>>> >><br>
>>>>> >> ______________________________<wbr>_________________<br>
>>>>> >> Personal_Submersibles mailing list<br>
>>>>> >> <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@<wbr>psubs.org</a>><br>
>>>>> >><br>
>>>>> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
>>>>> <<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a>><br>
>>>>> >><br>
>>>>> ><br>
>>>>> > ______________________________<wbr>_________________<br>
>>>>> > Personal_Submersibles mailing list<br>
>>>>> > <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@<wbr>psubs.org</a>><br>
>>>>> > <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
>>>>> <<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a>><br>
>>>>> ><br>
>>>>> ><br>
>>>>> > ______________________________<wbr>_________________<br>
>>>>> > Personal_Submersibles mailing list<br>
>>>>> > <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@<wbr>psubs.org</a>><br>
>>>>> > <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
>>>>> <<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a>><br>
>>>>> ><br>
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>>>>><br>
>>>>> ------------------------------<br>
>>>>><br>
>>>>> Message: 2<br>
>>>>> Date: Wed, 9 Aug 2017 15:46:22 +0000 (UTC)<br>
>>>>> From: james cottrell via Personal_Submersibles<br>
>>>>> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>><br>
>>>>> To: Personal Submersibles General Discussion<br>
>>>>> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>><br>
>>>>> Subject: Re: [PSUBS-MAILIST] Islamorada Trip Report...<br>
>>>>> Message-ID: <<a href="mailto:1907666847.421009.1502293582178@mail.yahoo.com">1907666847.421009.<wbr>1502293582178@mail.yahoo.com</a><br>
>>>>> <mailto:<a href="mailto:1907666847.421009.1502293582178@mail.yahoo.com">1907666847.421009.<wbr>1502293582178@mail.yahoo.com</a>>><br>
>>>>> Content-Type: text/plain; charset="utf-8"<br>
>>>>><br>
>>>>> Hi Cliff,<br>
>>>>> Congrats on your dives. Sub really looks great in those videos.<br>
>>>>> With regards to an AC solution, one low tech method would be to<br>
>>>>> blow air across ice in a small cooler. Water ice can be super<br>
>>>>> cooled with Dry Ice the night before. Dry ice is about - 100 F<br>
>>>>> and water ice cooled to this temperature should stay cold for<br>
>>>>> quite some time.<br>
>>>>> Greg C From: Cliff Redus via Personal_Submersibles<br>
>>>>> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>><br>
>>>>> To: Personal Submersibles General Discussion<br>
>>>>> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>><br>
>>>>> Sent: Wednesday, August 9, 2017 9:05 AM<br>
>>>>> Subject: Re: [PSUBS-MAILIST] Islamorada Trip Report...<br>
>>>>><br>
>>>>> Footage from my sub on the trip is limited due to condensation on<br>
>>>>> viewport.? I used Dove soap on the viewport interior?prior to<br>
>>>>> taking off but because of the humidity , temperature and duration<br>
>>>>> of the dive, this treatment did not last and I did not have more<br>
>>>>> soap on board.? The other issue is I only had two hand towels on<br>
>>>>> board and these became soaked with sweat.? As such, they were not<br>
>>>>> good for cleaning the condensation off?after the two hour tow to<br>
>>>>> the dive site.? Action items:? Have small bottle of Dove soap on<br>
>>>>> board and more towels for future long duration dives.?<br>
>>>>> Yes, I have been reading up on peltier coolers.? I have quite a<br>
>>>>> bit of battery capacity so this could work.? Unfortunately,<br>
>>>>> mounting on hull won't work for me as I have syntactic foam under<br>
>>>>> the FRP shell over the hull so I don't have a cool surface to<br>
>>>>> mount on.? I do have a pair of plugged off ports on the bottom of<br>
>>>>> the boat that would give me access to cooling water source if I<br>
>>>>> installed a small pump on this circuit.? Pushing this water<br>
>>>>> through a small fin-fan cooler like you would see on?water cooled<br>
>>>>> motorcycle would help with the temperature some what but<br>
>>>>> not?humidity.? ?At Islamorada, the average water temperature at<br>
>>>>> the time of the dive was about 87F so this would not have helped<br>
>>>>> all that much.? A small DC AC system that controlled both<br>
>>>>> temperature and humidity would be better.<br>
>>>>> On the thruster pneumatic pressure compensation, I was very happy<br>
>>>>> with how this worked.? I have all four of my thrusters connected<br>
>>>>> to 1/4" SS tubing that is manifold into a single pressure<br>
>>>>> reducing/relieving regulator (thanks Hugh) ?under the cover just<br>
>>>>> aft of the pilot.?I was not sure if a single regulator would work<br>
>>>>> or if I would need one for each thruster but it looks like one<br>
>>>>> was adequate.? I have had two deep dives with the arrangement,<br>
>>>>> one to 155 ft and one to 100 ft and have had no issues with water<br>
>>>>> in the thrusters.<br>
>>>>> Best Regards<br>
>>>>> Cliff<br>
>>>>> On Tue, Aug 8, 2017 at 10:50 PM, Alan via Personal_Submersibles<br>
>>>>> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@<wbr>psubs.org</a>>> wrote:<br>
>>>>><br>
>>>>> Thanks Cliff,I presume you shot some footage from your sub & this<br>
>>>>> is the entr?e!Nice & clear, you must have been pretty happy down<br>
>>>>> there!After you mentioned air conditioning, I looked into peltier<br>
>>>>> elements &air conditioning units. The peltier conditioners have<br>
>>>>> only 25% the efficiency?of a normal compression cycle system, but<br>
>>>>> are really small & by reversingthe polarity can act as heaters. A<br>
>>>>> few of those peltier elements stuck to the hull?with air<br>
>>>>> channelled past them might be the way to go! Not sure what<br>
>>>>> batteries youare using, but the new battery technologies on the<br>
>>>>> way will make energyexpenditure less of an issue!Do you have all<br>
>>>>> 4 motors exhausting through one regulator? Couldn't see any?air<br>
>>>>> coming out of the motor seals so the pressure isn't building up<br>
>>>>> too muchwhen exhausting.Cheers Alan<br>
>>>>><br>
>>>>><br>
>>>>> Sent from my iPad<br>
>>>>> On 9/08/2017, at 8:25 AM, Cliff Redus via Personal_Submersibles<br>
>>>>> <personal_submersibles@psubs. org> wrote:<br>
>>>>><br>
>>>>><br>
>>>>> Added two quick and dirty Youtube videos from 2017 Psubs<br>
>>>>> Regatta.? The first is the 100 ft dive 5.3 miles offshore on Aug<br>
>>>>> 3??<a href="https://www.youtube.com/" rel="noreferrer" target="_blank">https://www.youtube.com/</a> watch?v=sHqL49V0lMw?and the second is<br>
>>>>> a night dive in front of Doug's house??<a href="https://www.youtube" rel="noreferrer" target="_blank">https://www.youtube</a>.<br>
>>>>> com/watch?v=KDBw1ZOdKaI.? Alec is working on a more comprehensive<br>
>>>>> video of the Regatta.<br>
>>>>> Regards<br>
>>>>> Cliff<br>
>>>>> On Mon, Aug 7, 2017 at 4:53 PM, Douglas Suhr via<br>
>>>>> Personal_Submersibles <personal_submersibles@psubs. org> wrote:<br>
>>>>><br>
>>>>> Greetings PSUBS group, Douglas Suhr here to share my take on the<br>
>>>>> 4-day<br>
>>>>> sub operation we just completed in Islamorada, FL (July 31st, August<br>
>>>>> 1-3).<br>
>>>>><br>
>>>>> Wow, what a whirlwind! So July 31st was really an arrival / setup day<br>
>>>>> with August 1-3 being true operational days. Though it was<br>
>>>>> unfortunate<br>
>>>>> that Alec wasn't able to make it with Shackleton, we had our hands<br>
>>>>> full with Cliff's R-300. Without Shackleton, we also had enough time<br>
>>>>> to get Snoopy set up and lowered into the canal for some basic<br>
>>>>> diving.<br>
>>>>><br>
>>>>> List of Crew: Dan Lance, Steve McQueen, Cliff Redus, Rick Maxwell,<br>
>>>>> River Dolfi, Mike Patterson, Doug, Sarah, Douglas Suhr.<br>
>>>>><br>
>>>>> This was my first time meeting Dan Lance, a (retired) saturation<br>
>>>>> diver<br>
>>>>> and commercial welder. What a pleasure to have him join us on this<br>
>>>>> operation. Dan is modest, but most willing to share his knowledge and<br>
>>>>> extensive experience with a newbie like me. So pleased to have<br>
>>>>> chatted<br>
>>>>> with him in the Keys. During the towing of the R-300, Dan manned the<br>
>>>>> tow line and helped with comms.<br>
>>>>><br>
>>>>> Steve McQueen and River Dolfi did awesome jobs as our frog men.<br>
>>>>> Filming, attaching / detaching davit and tow lines, etc. they were<br>
>>>>> both in and out of the water quite a bit (especially Steve). I think<br>
>>>>> River took a little jelly sting for the team. What troopers!<br>
>>>>><br>
>>>>> Cliff and his assistant Rick are such a joy be around. Rick is one of<br>
>>>>> the friendliest people you'll ever meet (and even brought a gift for<br>
>>>>> the group: a watermelon, straight from Texas!). Cliff is always<br>
>>>>> willing to share his expertise (and sub, too) with anyone who'd like<br>
>>>>> to learn more. I know that between Dan Lance and Cliff, I learned<br>
>>>>> more<br>
>>>>> than I can remember last week.<br>
>>>>><br>
>>>>> Mike Patterson, mom, dad and myself were all just providing whatever<br>
>>>>> kind of "troop support" we could to Cliff and the R-300.<br>
>>>>><br>
>>>>> River, Steve and Myself got in some dive time on Snoopy in the canal<br>
>>>>> (which was great), but I think the biggest accomplishment was getting<br>
>>>>> the R-300 out a ways into the ocean.<br>
>>>>><br>
>>>>> Our Boston Whaler (a 25' boat with a single 250hp Yamaha) was able to<br>
>>>>> tow the R-300 out about 5 miles into the ocean (at about 4mph). We<br>
>>>>> were in radio communication with Cliff most of the time, though<br>
>>>>> we did<br>
>>>>> suffer a few intermittent losses in comms. When we got to a spot<br>
>>>>> about<br>
>>>>> 100 feet deep, we started to slow down a bit and at that point<br>
>>>>> the tow<br>
>>>>> line hook (an admittedly cheap thing) let loose(!) so we decided that<br>
>>>>> we had reached our dive location. We switched from marine radio<br>
>>>>> to OTS<br>
>>>>> and Cliff started down. Visibility was supurb! As Cliff neared the<br>
>>>>> bottom at 100 ? 110 feet, he was still quite visible from the Whaler!<br>
>>>>> His 18 foot long R-300 looked to be about 3 inches long, but wow did<br>
>>>>> it ever stand out from the rest of the sandy bottom. Cliff spent<br>
>>>>> about<br>
>>>>> an hour "flying" his sub, surfacing, diving and maneuvering about,<br>
>>>>> testing systems and observing the ocean around him. By the time Cliff<br>
>>>>> surfaced and we towed back to port Antigua, elapsed time stood at 4.5<br>
>>>>> / 5 hours (estimate). Cliff said that he stayed cool by the water<br>
>>>>> flowing over the sub's dome hatch while in tow. Upon returning I<br>
>>>>> think<br>
>>>>> we were all ready to take a break, but everyone felt great<br>
>>>>> accomplishment with the mission.<br>
>>>>><br>
>>>>> A couple of lessons I took away from the tow out: We need better tow<br>
>>>>> equipment (better line, hardware and maybe a quick release). Our boat<br>
>>>>> REALLY needs a GPS (still don't have one). Towing into waves isn't so<br>
>>>>> much a problem, but when towing with the waves, our tow line needs to<br>
>>>>> be measured so as to sustain the proper distance between tow vessel<br>
>>>>> and sub (otherwise the sub and boat are constantly slacking and then<br>
>>>>> jerking, stressing the tow line and making it difficult for boat and<br>
>>>>> sub to track straight).<br>
>>>>><br>
>>>>> The devotion of our crew was amazing, even in the heat and the waves<br>
>>>>> everyone did their jobs. Managing even a small sub operation like<br>
>>>>> this<br>
>>>>> is more work / effort than meets the eye, that's for sure. At dinner,<br>
>>>>> one of the main discussions revolved around a support vessel that can<br>
>>>>> carry a sub or two on board, eliminating the slow, time consuming tow<br>
>>>>> out to an ocean dive site. Dan Lance shared details on his support<br>
>>>>> vessel project, which is no doubt going to be a dream in terms of<br>
>>>>> logistics. Hopefully when said vessel is ready to sail, Dan will lend<br>
>>>>> its services to host a diving event! ~ Douglas S.<br>
>>>>><br>
>>>>> ______________________________ _________________<br>
>>>>> Personal_Submersibles mailing list<br>
>>>>> Personal_Submersibles@psubs.or<br>
>>>>> <mailto:<a href="mailto:Personal_Submersibles@psubs.or">Personal_Submersibles@<wbr>psubs.or</a>> g<br>
>>>>> <a href="http://www.psubs.org/mailman/l" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/l</a> istinfo.cgi/personal_submersib les<br>
>>>>><br>
>>>>><br>
>>>>><br>
>>>>><br>
>>>>> ______________________________ _________________<br>
>>>>> Personal_Submersibles mailing list<br>
>>>>> Personal_Submersibles@psubs. org<br>
>>>>> <a href="http://www.psubs.org/mailman/" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/</a> listinfo.cgi/personal_ submersibles<br>
>>>>><br>
>>>>><br>
>>>>> ______________________________ _________________<br>
>>>>> Personal_Submersibles mailing list<br>
>>>>> Personal_Submersibles@psubs. org<br>
>>>>> <a href="http://www.psubs.org/mailman/" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/</a> listinfo.cgi/personal_ submersibles<br>
>>>>><br>
>>>>><br>
>>>>><br>
>>>>> ______________________________<wbr>_________________<br>
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>>>>> <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
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>>>>> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
>>>>> <<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a>><br>
>>>>><br>
>>>>><br>
>>>>><br>
>>>>><br>
>>>>> | | Virus-free. <a href="http://www.avast.com" rel="noreferrer" target="_blank">www.avast.com</a> <<a href="http://www.avast.com" rel="noreferrer" target="_blank">http://www.avast.com</a>> |<br>
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>>>>> <a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.whoweb.com/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
>>>>> <<a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.whoweb.com/<wbr>mailman/listinfo.cgi/personal_<wbr>submersibles</a>><br>
>>>>><br>
>>>>><br>
>>>>> ------------------------------<br>
>>>>><br>
>>>>> End of Personal_Submersibles Digest, Vol 50, Issue 19<br>
>>>>> ******************************<wbr>***********************<br>
>>>>> ______________________________<wbr>_________________<br>
>>>>> Personal_Submersibles mailing list<br>
>>>>> <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
>>>>> <mailto:<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@<wbr>psubs.org</a>><br>
>>>>> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
>>>>> <<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a>><br>
>>>> ______________________________<wbr>_________________<br>
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>>>> <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
>>>> <mailto:<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@<wbr>psubs.org</a>><br>
>>>> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
>>>> <<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a>><br>
>>> ______________________________<wbr>_________________<br>
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>>> <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a> <mailto:<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@<wbr>psubs.org</a>><br>
>>> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
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>>> ______________________________<wbr>_________________<br>
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>>> <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
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>><br>
>> --<br>
>> Archivale catalog: <a href="http://www.archivale.com/catalog" rel="noreferrer" target="_blank">http://www.archivale.com/<wbr>catalog</a><br>
>> Polymath weblog: <a href="http://www.archivale.com/weblog" rel="noreferrer" target="_blank">http://www.archivale.com/<wbr>weblog</a><br>
>> Translations (ProZ profile): <a href="http://www.proz.com/profile/639380" rel="noreferrer" target="_blank">http://www.proz.com/profile/<wbr>639380</a><br>
>> Translations (BeWords profile): <a href="http://www.bewords.com/Marc-dePiolenc" rel="noreferrer" target="_blank">http://www.bewords.com/Marc-<wbr>dePiolenc</a><br>
>> Ducted fans: <a href="http://massflow.archivale.com/" rel="noreferrer" target="_blank">http://massflow.archivale.com/</a><br>
>> ______________________________<wbr>_________________<br>
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><br>
><br>
> ______________________________<wbr>_________________<br>
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><br>
<br>
--<br>
Archivale catalog: <a href="http://www.archivale.com/catalog" rel="noreferrer" target="_blank">http://www.archivale.com/<wbr>catalog</a><br>
Polymath weblog: <a href="http://www.archivale.com/weblog" rel="noreferrer" target="_blank">http://www.archivale.com/<wbr>weblog</a><br>
Translations (ProZ profile): <a href="http://www.proz.com/profile/639380" rel="noreferrer" target="_blank">http://www.proz.com/profile/<wbr>639380</a><br>
Translations (BeWords profile): <a href="http://www.bewords.com/Marc-dePiolenc" rel="noreferrer" target="_blank">http://www.bewords.com/Marc-<wbr>dePiolenc</a><br>
Ducted fans: <a href="http://massflow.archivale.com/" rel="noreferrer" target="_blank">http://massflow.archivale.com/</a><br>
<br>
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<br>
End of Personal_Submersibles Digest, Vol 50, Issue 34<br>
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</blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">-River J. Dolfi<div><br><div>412-997-2526</div><div><a href="mailto:rdolfi7@gmail.com" target="_blank">rdolfi7@gmail.com</a></div><div><a href="mailto:rwd5301@psu.edu" target="_blank">rwd5301@psu.edu</a></div></div></div></div>
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