New project - Neptune - a fantasy boat project

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  • DrSchmidt
    Captain
    • Apr 2014
    • 919

    #31
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    The pressure switch is works differentially - it senses the pressuer difference beween two points, in my case the inside of the wtc and the inside of the tank. When the tank fills, the air moves freely into the wtc and both tank and wtc pressure are the same. When the tank is full, the valve shuts off the tank, but the pump tries to force additional water into the tank. The tank pressure rises above the wtc pressure shutting the pum off. Norbert Bruggens way of doing things....


    Comment

    • redboat219
      Admiral
      • Dec 2008
      • 2735

      #32
      Would it be simpler to use a close tank than venting into the WTC?
      Make it simple, make strong, make it work!

      Comment

      • redboat219
        Admiral
        • Dec 2008
        • 2735

        #33
        I have found that a 7psi switch is a commonly used switch for fuel pressure lights and NO2 indicators in hot rods..so we go with 7psi-it should still work -just a
        Make it simple, make strong, make it work!

        Comment

        • DrSchmidt
          Captain
          • Apr 2014
          • 919

          #34
          Originally posted by redboat219
          Would it be simpler to use a close tank than venting into the WTC?
          How do you fill a closed tank? The Air has to go somewhere.....

          Comment

          • redboat219
            Admiral
            • Dec 2008
            • 2735

            #35
            Originally posted by DrSchmidt

            How do you fill a closed tank? The Air has to go somewhere.....
            Gases (Air) have
            nice characteristics, one of the is compressability. As you fill the tank with water the air gets compressed and it's volume decreases. So it's still inside the tank.Look up Boyle's law.
            Make it simple, make strong, make it work!

            Comment

            • DrSchmidt
              Captain
              • Apr 2014
              • 919

              #36
              Well I have a Phd in physics and know about compressability. The question is, why would I pursue an approach that puts immense pressure on tank, pump and hoses while leaving 20-30% of the tank empty.

              Comment

              • RCSubGuy
                Welcome to my underwater realm!
                • Aug 2009
                • 1768

                #37
                The sealed pressure ballast system is a tried and true method of ballast control in RC subs. OTW and Sheerline have been using it for decades. Engel boats also pressure up the dry compartments of their boats during piston tank actuation.

                The lost volume of the ballast tank is less of an issue with the large boats that typically use these systems. They're not suitable for small boats where space is at a premium, but for big boys, they're a completely valid alternative.

                Bob

                Comment

                • DrSchmidt
                  Captain
                  • Apr 2014
                  • 919

                  #38
                  Originally posted by SubHuman
                  The sealed pressure ballast system is a tried and true method of ballast control in RC subs. OTW and Sheerline have been using it for decades. Engel boats also pressure up the dry compartments of their boats during piston tank actuation.

                  The lost volume of the ballast tank is less of an issue with the large boats that typically use these systems. They're not suitable for small boats where space is at a premium, but for big boys, they're a completely valid alternative.

                  Bob
                  Exactly......the air from the tank goes into the dry space of the wtc and the pressure rise is accebtable. Sealing off the tank and pumping water into it till the pressure of the pump is maxed out is just hard on the hoses, conections, the pump, and last but not least the battery, as the pump will draw allot of current when working againts the pressure in the tank.

                  Comment

                  • DrSchmidt
                    Captain
                    • Apr 2014
                    • 919

                    #39
                    Finished the WTC for my little fantasy boat Neptun. Ballast system uses a peristaltic pump with a float and a water switch to turn the pump off when the tank is full. Pump controlled by a Brüggen BTS and auto-leveler by Engel. 3s lipo as power source, corona receiver, and a outrunner brushless to drive the prop. I like how compact is turned out...

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                    Comment

                    • SubDude
                      Captain
                      • Dec 2019
                      • 803

                      #40
                      Originally posted by DrSchmidt
                      Finished the WTC for my little fantasy boat Neptun. Ballast system uses a peristaltic pump with a float and a water switch to turn the pump off when the tank is full. Pump controlled by a Brüggen BTS and auto-leveler by Engel. 3s lipo as power source, corona receiver, and a outrunner brushless to drive the prop. I like how compact is turned out...

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                      Looks very clean and well thought out.

                      Comment

                      • DrSchmidt
                        Captain
                        • Apr 2014
                        • 919

                        #41
                        Thanks. Proper CAD designing prior to a built helps allot ;-)

                        Comment

                        • DrSchmidt
                          Captain
                          • Apr 2014
                          • 919

                          #42
                          Good news, WTC is water tight and the ballast system works fine! Just the snorkel missing and then trimming.

                          Comment

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

                            #43
                            Originally posted by DrSchmidt
                            Good news, WTC is water tight and the ballast system works fine! Just the snorkel missing and then trimming.
                            Gotta get those off to you -- long ago promised, but life got in the way. This week, I promise.

                            David
                            Who is John Galt?

                            Comment

                            • DrSchmidt
                              Captain
                              • Apr 2014
                              • 919

                              #44
                              Started printing parts for my version as well. But I doubt that it'll work right away. Might need some iterations....

                              Comment

                              • DrSchmidt
                                Captain
                                • Apr 2014
                                • 919

                                #45
                                The WTC and the diving system are working fine. I added a snorkel valve and I just need to add a guidance for the float of the valve. Then everything is ready for trimming.

                                Comment

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