Small air / vacuum pump

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  • robse
    Junior Member
    • Mar 2003
    • 183
    #1

    Small air / vacuum pump

    Hi all
    I'm re-designing my ballast tank, and dive system, but have run into a slight problem. My ballast tank will be open to the sea at the bottom through multible holes, and I will then control the diving by letting air out the top, or pushing air in. So far, so good. BUT..
    Rather than having the weight of the sub "pull down the sub" by pushing the air out through hoses, valve and blow ports, I believe I have to suck the air out in order to improve diving speed / rate.
    (Blowing the tank will be done by compressed air, no problem there.)

    How do you go about sucking the air out? What kind of pumps do you use, when a bottom-placed water pump, pushing the water in, is not an option?

    Hope to get some great ideas from you guys..
    Tags: None
    • bigdave
      Junior Member
      • Feb 2003
      • 3596
      #2
      You would be amazed how

      You would be amazed how fast the water comes in and the air goes out even through the smallest vents. I would do some tests before you decide to use a pump. BD.
      sigpic"Eat your pudding Mr Land"
      "I ain't sure it's pudden" 20K

        Comment

        • hakkikt
          Junior Member
          • Jun 2006
          • 246
          #3
          If you feel that your

          If you feel that your tank is emptying too slowly, why not just use a bigger vent on top (or multiple vents, like the real thing)? Should be a lot less complex to do than a pump.

            Comment

            • Guest
              #4
              Hi
              I have made my

              Hi
              I have made my ballast tanks for the onboard air compressor with at least 3 top vents and a single solinoid valve that is wet.Also the bottom vents are open all the time with at least 4 to 8 holes depending on size of the tank,usualy quite large one for the Alfa.
              For a tank that holds about a ballon of watter the sub dives in about 2 minutes to keep it as scale as possible but its easy to adjust with smaller holes and top vents.

              Be sure to use plenty of baffles to prevent going out of trim and ballance the sub with the tank all the way full of water hence the multiple top vents in a simple manifold to one solinoid valve.
              I installed 2 large gell cells batteries in the ballast tank of the Alfa,well sealed terminals and secured does the job,giving lots of space for other stuf, like periscopes and air banks.
              If you can use a tire inflator go for it its the most eficient pump out there for the money. IDC corp. or Ingersold Rand available at any autoparts store will do.
              You will injoy the ability to adjust the waterline of you sub with ease and without having to bring her back in to shore for a recharge.Write me for any info you might need

              Dave Amur ship yard


                Comment

                • robse
                  Junior Member
                  • Mar 2003
                  • 183
                  #5
                  Hi http://www.subcommittee.com/forum/icon_smile.gif

                  Thanks for your replys,

                  Hi

                  Thanks for your replys, all
                  "Be sure to use plenty of baffles to prevent going out of trim "... do you mean to put in bulkhead(s) in the tank, preventing water from moving freely around in there? (Similar to a tank-truck)

                  I'll go and test the use of multible vents, and weight-decent prior to getting a pump. Like to save the battery. But thanks for the tip.

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