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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=black vlink=black><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Marc,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I am in the final throes of finishing twin engine driven 2 man and I have opted for the following:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>2 x 2” Snorkels with plastic float valves leading into the cabin through 2 x 2” combination valves being manual ball valves coupled to air actuated shuttle valves and fitted with non return valves.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>This means that the non return valves will vent overpressure situation on the surface and blow out through the snorkel float valves.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The snorkels are located inside an airbox leading into the boat part which has about 4 cubic meters of air volume so that if I go through a wave the float valve does not get to close and the air is drawn from the “air box” volume for a brief period.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The air is then drawn from the cabin again through 2 x combination valves into the engine pressure chambers. The exhaust which also takes a large portion of the engine cooling water goes through a raised exhaust line above the water level then down through an air operated shuttle valve and a non return valve exiting underwater through the center of the propeller as per an outboard motor or stern leg. According to the rules you should have 2 valves on the exhaust. I am relying on the air drawn through the cabin for cooling and as most of the cabin is protected by fiberglass I am hoping that it wont get too much direct heating from the sun apart from through the domes. When the air operated shuttle valves are closed ready for diving the engines will pull a vacuum of approx 1-2 psi before shutting down. IF no vacuum maintained then no dive and the engines keep running. All untested yet but hoping I am only about 8 weeks away. Carsten’s system is all tested and proven. Regards, Hugh<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b><br><b>Sent:</b> Saturday, 12 October 2013 6:33 a.m.<br><b>To:</b> Personal Submersibles General Discussion<br><b>Subject:</b> Re: [PSUBS-MAILIST] Diesel Exhaust<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Hi Marc,<br> <br>before I response in detail, which size should the sub have? And which range?<br><br>And which kind of wave high, wave length and weather you want to survife on the surface?<br>Any concept sketch? Do you like to snorckel with the sub? <br><br>Euronaut has more problems with the short medium high wave in the baltic <br>than with the high but long waves in the north sea.<br> <br>Bad weather in the north sea lift the hole boat before the wave reach the sail, but in the Baltic the waves are <br>shorter and did mot lift the boat so much - as result the sail goes very wet. Like in the movie "Das Boot"<br><br>Short wave in the baltic: <br><a href="http://www.euronaut.org/content/gfx/operational/IMG_8705.jpg">http://www.euronaut.org/content/gfx/operational/IMG_8705.jpg</a><br><br>Here the over waterline exhaust of Euronaut in operation. <br>The funny sound comes from a wave flap close to the end of the exhaust <br>which goes up and down at idlle speed. <br><a href="http://www.youtube.com/watch?v=PT7i05s92ak">http://www.youtube.com/watch?v=PT7i05s92ak</a><br><br>Cooling is also something you should have in mind. <br><br>And noise.. <br><br>And..<br><br>vbr Carsten<br><br><o:p></o:p></p><div><div><div><div><p class=MsoNormal style='background:white'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> Marc <span class=mark>de</span> <span class=mark>Piolenc</span> <<a href="mailto:piolenc@archivale.com">piolenc@archivale.com</a>><br><b>To:</b> <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> <br><b>Sent:</b> Thursday, October 10, 2013 10:15 PM<br><b>Subject:</b> Re: [PSUBS-<span class=mark>MAILIST</span>] Dive report - Pickles Reef</span><span style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'><br>I&<span class=mark>apos</span>;<span class=mark>ve</span> been following this discussion with great interest. I don&<span class=mark>apos</span>;t have a <br>sub yet, but I do live in the Tropics, and as there&<span class=mark>apos</span>;s no cold current <br>handy to where I live any subbing I do will be in water pretty near air <br>temperature. As you might expect, I&<span class=mark>apos</span>;<span class=mark>ve</span> given this problem a lot of thought.<br><br>My tentative conclusion is that, if I build a sub, I will have to make <br>it more autonomous than is the rule on this list. Specifically, it will <br>need a combustion engine to ferry itself on the surface to dive sites, <br>and to maintain comfort and keep the battery topped off for diving while <br>doing so. I started with the assumption that I would need an air <br>conditioning unit running off a small industrial diesel, but then I <br>realized that, if I use a snorkel exhausting into the cabin, and have <br>the diesel draw air from the cabin, I get continuous renewal of the air <br>in the cabin without the cost, power burden and safety problems of <br>running a Rankine cycle refrigeration system. That&<span class=mark>apos</span>;s the solution that <br>I&<span class=mark>apos</span>;<span class=mark>ve</span> retained for the moment. Of course I also need a secure means of <br>preventing exhaust gas from being aspirated into the snorkel (I can&<span class=mark>apos</span>;t <br>quite understand how naval submarines manage to combine both functions <br>in one mast), but that might be as simple as having the diesel exhaust <br>flush with the hull, with some arrangement to prevent water from coming <br>in. Since the diesel would only be used on the surface, and the snort <br>would only be there to allow a low-<span class=mark>freeboard</span> hatch to be kept closed, <br>the power penalty would be minimal.<br><br>Fuel storage, fuel feed and the like still have to be worked out. Naval <br>submarines have very complex arrangements for this, and that complexity <br>must be tolerated for a good reason. Even so, I need a simpler way to do <br>it that still protects the fuel from contamination and me from asphyxiation.<br><br>Marc <span class=mark>de</span> <span class=mark>Piolenc</span><o:p></o:p></span></p></div></div></div></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>-- <br><br>Carsten Standfuß<br>Dipl.Ing.Schiffbau @ Meerestechnik<br>Heinrich Reck Str.12A<br>18211 Admannshagen<br><br>0172 8464 420<br><a href="http://WWW.Euronaut.org">WWW.Euronaut.org</a><br><a href="mailto:Carsten@euronaut.org">Carsten@euronaut.org</a></span> <br><br>__________ Information from ESET NOD32 Antivirus, version of virus signature database 8903 (20131010) __________<br><br>The message was checked by ESET NOD32 Antivirus.<br><br><a href="http://www.eset.com">http://www.eset.com</a><o:p></o:p></p></div> <BR><BR>__________ Information from ESET NOD32 Antivirus, version of virus signature database 8903 (20131010) __________<BR><BR>The message was checked by ESET NOD32 Antivirus.<BR><BR><A HREF="http://www.eset.com">http://www.eset.com</A><BR> </body></html>