New project - Neptune - a fantasy boat project

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  • redboat219
    Admiral
    • Dec 2008
    • 2735

    #46
    Any photos?

    Wait, a snorkel valve? I thought this uses a peristaltic pump that fills and empties a tank that vents into the WTC?
    Last edited by redboat219; 12-29-2020, 06:12 AM.
    Make it simple, make strong, make it work!

    Comment

    • DrSchmidt
      Captain
      • Apr 2014
      • 919

      #47
      Yes, the pump vents into the WTC, but: Peristaltic pumps also pump air. If you empty the ballast tank long enough, i.e. too long, the pump will create a vacuum in the WTC. To avoid the vacuum, I've attached a snorkel valve on the WTC that equillizes the pressure between inside and outside when surfaced.

      Comment

      • DrSchmidt
        Captain
        • Apr 2014
        • 919

        #48
        I've been lazy, but finally I made some final adjustments. As mentioned above, I have added one of David's excellent snorkel valves to the WTC to avoid the creation of a vacuum by the peristaltic pump. I've added a guide rod to the flaot of the valve to dial in its position. Next is trimming.

        Click image for larger version

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        Click image for larger version

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        Comment

        • redboat219
          Admiral
          • Dec 2008
          • 2735

          #49
          Originally posted by DrSchmidt
          I've been lazy, but finally I made some final adjustments. As mentioned above, I have added one of David's excellent snorkel valves to the WTC to avoid the creation of a vacuum by the peristaltic pump. I've added a guide rod to the flaot of the valve to dial in its position. Next is trimming.

          Click image for larger version

Name:	Neptun-1.jpg
Views:	262
Size:	71.8 KB
ID:	148910


          Click image for larger version

Name:	Neptun-2.jpg
Views:	213
Size:	43.8 KB
ID:	148911

          Hello,
          I just want to ask you if you , did you put any water catcher under your snorkel to catch any stray water droplets that could get sucked in through the induction pipe?
          Make it simple, make strong, make it work!

          Comment

          • DrSchmidt
            Captain
            • Apr 2014
            • 919

            #50
            Actually I removed the snorkel. It's easy to see when the ballast tank is empty and to stopp the pump in time.

            Cheers Andreas

            Comment

            • redboat219
              Admiral
              • Dec 2008
              • 2735

              #51
              Originally posted by DrSchmidt
              Actually I removed the snorkel. It's easy to see when the ballast tank is empty and to stopp the pump in time.

              Cheers Andreas
              Oh. Was hoping to get some feedback from you if it prevents ingress of water into the WTC. I have one of those mini air pumps I took out of a broken digital sphygmomanometer that I want to try and use as a low pressure blower, unfortunately it only has the outlet nipple. No visible intake port to attach the snorkel induction tube. Plan is to attach the snorkel intake with float valve directly to the wtc then let the airpump suck the air inside the wtc to blow the ballast tank, something like on a real submarine.
              Make it simple, make strong, make it work!

              Comment

              • DrSchmidt
                Captain
                • Apr 2014
                • 919

                #52
                I use a peristaltic pump to pump water in and out the ballast tank. So the snorkel's only job would have been leveling inside and outside pressure in case I accidentally keep the pump on too long and not only drain the water from the ballast tank but also air from the WTC, thereby creating a vacuum.

                Comment

                • redboat219
                  Admiral
                  • Dec 2008
                  • 2735

                  #53
                  Any updates?
                  Make it simple, make strong, make it work!

                  Comment

                  • DrSchmidt
                    Captain
                    • Apr 2014
                    • 919

                    #54
                    It works.....I run it from time to time.

                    Comment

                    • redboat219
                      Admiral
                      • Dec 2008
                      • 2735

                      #55
                      Any photos or videos?
                      Make it simple, make strong, make it work!

                      Comment

                      • DrSchmidt
                        Captain
                        • Apr 2014
                        • 919

                        #56
                        Sorry, no....

                        Comment

                        • He Who Shall Not Be Named
                          Moderator
                          • Aug 2008
                          • 12256

                          #57
                          Originally posted by redboat219
                          Any photos or videos?
                          How about you... got any photos or videos of your work to share?

                          ... anything?

                          David
                          Provocateur Extraordinaire
                          Who is John Galt?

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