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New project - Neptune - a fantasy boat project

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  • #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....


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

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      • #33
        https://forum.rc-sub.com/forum/tips-...-came-together
        Make it simple, make strong, make it work!

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        • #34
          Originally posted by redboat219 View Post
          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.....

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          • #35
            Originally posted by DrSchmidt View Post

            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!

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            • #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.

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              • #37
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                Who am I to question what the doctor ordered?
                Last edited by redboat219; 10-25-2020, 02:43 AM.
                Make it simple, make strong, make it work!

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                • #38
                  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

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                  • #39
                    Originally posted by SubHuman View Post
                    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.

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                    • #40
                      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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                      • #41
                        Originally posted by DrSchmidt View Post
                        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.

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                        • #42
                          Thanks. Proper CAD designing prior to a built helps allot ;-)

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                          • #43
                            Good news, WTC is water tight and the ballast system works fine! Just the snorkel missing and then trimming.

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                            • #44
                              Originally posted by DrSchmidt View Post
                              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
                              "... well, that takes care of Jorgenson's theory!"

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                              • #45
                                Started printing parts for my version as well. But I doubt that it'll work right away. Might need some iterations....

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