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New project - Neptune - a fantasy boat project

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  • DrSchmidt
    replied
    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.

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  • redboat219
    replied
    Any updates?

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  • DrSchmidt
    replied
    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.

    Leave a comment:


  • redboat219
    replied
    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, 05:12 AM.

    Leave a comment:


  • DrSchmidt
    replied
    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.

    Leave a comment:


  • redboat219
    replied
    Any updates herr doktor?

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  • DrSchmidt
    replied
    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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  • He Who Shall Not Be Named
    replied
    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

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

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  • DrSchmidt
    replied
    Thanks. Proper CAD designing prior to a built helps allot ;-)

    Leave a comment:


  • RCJetDude
    replied
    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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  • DrSchmidt
    replied
    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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  • DrSchmidt
    replied
    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.

    Leave a comment:


  • SubHuman
    replied
    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

    Leave a comment:


  • redboat219
    replied
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    Who am I to question what the doctor ordered?
    Last edited by redboat219; 10-25-2020, 01:43 AM.

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