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<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: arial, helvetica, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 16px; RIGHT: auto">Captain <SPAN id=misspell-0 class=mark>Kittredge</SPAN> built a couple of diesel subs that worked very well. In his design, <SPAN id=misspell-1><SPAN>exhaust</SPAN></SPAN> went straight down into the water at the bottom of the hull. The exhaust exit was directly behind what looked like a "v" shaped steel <VAR id=yui-ie-cursor></VAR><SPAN id=misspell-2 class=mark>skeg</SPAN> that created a low pressure area when the sub was moving forward. The low pressure area reduced back pressure on the exhaust.</div>
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<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: arial, helvetica, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 16px; RIGHT: auto"><SPAN id=misspell-3><SPAN>Incidentally</SPAN></SPAN>, one of George's customers bought a diesel sub from him but took it down one time without closing the exhaust valve. Water entered one of the cylinders in the diesel and bent either the crank or the rods when he tried to start the engine.</div>
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<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: arial, helvetica, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 16px; RIGHT: auto">Greg</div>
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<DIV style="BORDER-BOTTOM: #ccc 1px solid; BORDER-LEFT: #ccc 1px solid; PADDING-BOTTOM: 0px; LINE-HEIGHT: 0; MARGIN: 5px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; BORDER-RIGHT: #ccc 1px solid; PADDING-TOP: 0px" class=hr contentEditable=false readonly="true"></DIV><FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Marc <SPAN id=misspell-4 class=mark>de</SPAN> <SPAN id=misspell-5 class=mark>Piolenc</SPAN> <piolenc@archivale.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> personal_submersibles@psubs.org <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, October 10, 2013 10:15 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [PSUBS-<SPAN id=misspell-7 class=mark>MAILIST</SPAN>] Dive report - Pickles Reef<BR></FONT></DIV>
<DIV style="RIGHT: auto" class=y_msg_container><BR>I&<SPAN id=misspell-8 class=mark>apos</SPAN>;<SPAN id=misspell-9 class=mark>ve</SPAN> been following this discussion with great interest. I don&<SPAN id=misspell-10 class=mark>apos</SPAN>;t have a <BR clear=none>sub yet, but I do live in the Tropics, and as there&<SPAN id=misspell-11 class=mark>apos</SPAN>;s no cold current <BR clear=none>handy to where I live any subbing I do will be in water pretty near air <BR clear=none>temperature. As you might expect, I&<SPAN id=misspell-12 class=mark>apos</SPAN>;<SPAN id=misspell-13 class=mark>ve</SPAN> given this problem a lot of thought.<BR clear=none><BR clear=none>My tentative conclusion is that, if I build a sub, I will have to make <BR clear=none>it more autonomous than is the rule on this list. Specifically, it will <BR clear=none>need a combustion engine to ferry itself on the surface to dive sites, <BR clear=none>and to maintain comfort
and keep the battery topped off for diving while <BR clear=none>doing so. I started with the assumption that I would need an air <BR clear=none>conditioning unit running off a small industrial diesel, but then I <BR clear=none>realized that, if I use a snorkel exhausting into the cabin, and have <BR clear=none>the diesel draw air from the cabin, I get continuous renewal of the air <BR clear=none>in the cabin without the cost, power burden and safety problems of <BR clear=none>running a Rankine cycle refrigeration system. That&<SPAN id=misspell-14 class=mark>apos</SPAN>;s the solution that <BR clear=none>I&<SPAN id=misspell-15 class=mark>apos</SPAN>;<SPAN id=misspell-16 class=mark>ve</SPAN> retained for the moment. Of course I also need a secure means of <BR clear=none>preventing exhaust gas from being aspirated into the snorkel (I can&<SPAN id=misspell-17 class=mark>apos</SPAN>;t <BR clear=none>quite understand how naval submarines manage to
combine both functions <BR clear=none>in one mast), but that might be as simple as having the diesel exhaust <BR clear=none>flush with the hull, with some arrangement to prevent water from coming <BR clear=none>in. Since the diesel would only be used on the surface, and the snort <BR clear=none>would only be there to allow a low-<SPAN id=misspell-18 class=mark>freeboard</SPAN> hatch to be kept closed, <BR clear=none>the power penalty would be minimal.<BR clear=none><BR clear=none>Fuel storage, fuel feed and the like still have to be worked out. Naval <BR clear=none>submarines have very complex arrangements for this, and that complexity <BR clear=none>must be tolerated for a good reason. Even so, I need a simpler way to do <BR clear=none>it that still protects the fuel from contamination and me from asphyxiation.<BR clear=none><BR clear=none>Marc <SPAN id=misspell-19 class=mark>de</SPAN> <SPAN id=misspell-20 class=mark>Piolenc</SPAN><BR clear=none><BR
clear=none>On 10/11/2013 1:45 AM, Land N Sea wrote:<BR clear=none>> I have been out of the loop for 5 weeks on the mainland on my sailboat<BR clear=none>> and I should of read all the emails before responding when I got back. I<BR clear=none>> did view the great footage and noticed that my tower looked a little<BR clear=none>> taller (good for water ingress) and of course <SPAN id=misspell-21 class=mark>doesn</SPAN>’t have the dome so I<BR clear=none>> hopefully won’t have quite as bad of a heat problem as one with the dome<BR clear=none>> but I was thinking about Emile’s clear acrylic fairing as an option when<BR clear=none>> I heard about the water egress problems with a three foot chop.<BR clear=none>> It does get pretty hot here and we are about the same latitude as<BR clear=none>> Florida so I will probably be trying Phil’s idea of the frozen pouches<BR clear=none>> vest and or the gallon of frozen water and
have the air coming out of my<BR clear=none>> scrubber blowing against it.<BR clear=none>-- <BR clear=none><SPAN id=misspell-22 class=mark>Archivale</SPAN> catalog: <A href="http://www.archivale.com/catalog" shape=rect target=_blank>http://www.archivale.com/catalog</A><BR clear=none>Polymath <SPAN id=misspell-23 class=mark>weblog</SPAN>: <A href="http://www.archivale.com/weblog" shape=rect target=_blank>http://www.archivale.com/weblog</A><BR clear=none>Translations (<SPAN id=misspell-24 class=mark>ProZ</SPAN> profile): <A href="http://www.proz.com/profile/639380" shape=rect target=_blank>http://www.proz.com/profile/639380</A><BR clear=none>Translations (<SPAN id=misspell-25 class=mark>BeWords</SPAN> profile): <A href="http://www.bewords.com/Marc-dePiolenc" shape=rect target=_blank>http://www.bewords.com/Marc-dePiolenc</A><BR clear=none>Ducted fans: <A href="http://massflow.archivale.com/" shape=rect target=_blank>http://massflow.archivale.com/</A>
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