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  • mloo123
    Lieutenant
    • Apr 2022
    • 52

    #31
    Originally posted by redboat219
    What happened to the photos? Anyway, congratulations with the tank test.
    Btw, the ballast tank system inspired by this video:

    Comment

    • redboat219
      Admiral
      • Dec 2008
      • 2735

      #32
      Originally posted by mloo123
      Thanks for the congrats.

      As for the photos, im not sure why it's blocked by the moderator somehow during in the middle of editing some posts...
      If you edit your post more than 2 times in a day the system flags it as a spam and blocks it. Just post a new one.
      Make it simple, make strong, make it work!

      Comment

      • redboat219
        Admiral
        • Dec 2008
        • 2735

        #33
        Any video?
        Make it simple, make strong, make it work!

        Comment

        • mloo123
          Lieutenant
          • Apr 2022
          • 52

          #34
          Originally posted by redboat219

          If you edit your post more than 2 times in a day the system flags it as a spam and blocks it. Just post a new one.
          Oic... that's mean tho!

          Comment

          • redboat219
            Admiral
            • Dec 2008
            • 2735

            #35
            Mloo123,
            Are you using a 7.2v pack?
            Windshield washer pumps are usually rated to run 12V, any problems running it at a lower voltage?
            Also, as you did not use a blocking servo, any problem with water leaking pass the pump and prematurely flooding the tank when the boat is surfaced?
            Last edited by redboat219; 05-01-2022, 03:20 AM.
            Make it simple, make strong, make it work!

            Comment

            • JHapprich
              Captain
              • Oct 2017
              • 712

              #36
              Redboat219, did you actually EVER build a RC submarine? Do you have ANY real experience running such vessel?

              Don't get me wrong, iam actually interested in knowing the cause for all those questions. I for myself am rather practical, i build, test and improve and solved most of that basic stuff very early in my first attempts to make a model run.

              12v pumps with gears etc will work fine at 7.2v, only pumps that wont i know if are perustaltic pumps with 380' rs motors.

              I used a 12v gear pump running at 6v with now problems.

              if you put your water intake high int the ballast tank, but the outer end low deep in the water, it wont leak.

              I made all kind of tanks exept for gas powered systems.

              Regards Jörg
              Last edited by JHapprich; 05-01-2022, 04:08 AM.

              Comment

              • redboat219
                Admiral
                • Dec 2008
                • 2735

                #37
                Originally posted by JHapprich
                Redboat219, did you actually EVER build a RC submarine? Do you have ANY real experience running such vessel?
                Building yes.
                Running not yet.
                Make it simple, make strong, make it work!

                Comment

                • mloo123
                  Lieutenant
                  • Apr 2022
                  • 52

                  #38
                  Originally posted by redboat219
                  Mloo123,
                  Are you using a 7.2v pack?
                  Windshield washer pumps are usually rated to run 12V, any problems running it at a lower voltage?
                  Also, as you did not use a blocking servo, any problem with water leaking pass the pump and prematurely flooding the tank when the boat is surfaced?
                  Although these geared pumps were rated 12Vdc, you can still run them undervoltage at expense of decreased efficiency. However that doesn't impact the performance of the ballast function which is more than enough use.

                  Actually I have thought I might need a solenoid valve or blocking servo to prevent back flow or Intrusion of water, but after noticing that it's not significant maybe due to the surrounding pressure when surface, thus it's not necessary to install one. Unless the ballast tank is pressurized type with a high pressure pump type then a solenoid valve is necessary.

                  There's another type of pump, a peristaltic type which will solve the back flow problem, but they were much less efficient than a geared pump. I have used them before and didn't like it.

                  ​​​​​​​

                  Comment

                  • JHapprich
                    Captain
                    • Oct 2017
                    • 712

                    #39
                    Originally posted by redboat219

                    Building yes.
                    Running not yet.
                    Go run it. Will answer your questions

                    enjoy your first ride

                    Comment

                    • JHapprich
                      Captain
                      • Oct 2017
                      • 712

                      #40
                      Originally posted by redboat219

                      Building yes.
                      Running not yet.
                      Go run it. Will answer your questions

                      enjoy your first ride

                      Comment

                      • mloo123
                        Lieutenant
                        • Apr 2022
                        • 52

                        #41
                        Re-posting...

                        Done some tests with my mini water pool...

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                        Periscope depth. Not perfect due to ballast tank not centralized located and bow will pitched down when adding more ballast. Tried add flotation foam at bow but ballast capacity limited to bring lower depths unless add more ballast weight to lowered waterline much more when surfaces... Any tips?

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                        Full dive...

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                        WOT test for full min on shaft seal...

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                        End of trimming test, next checking water leaks on WTC.

                        Tests results shows battery compartment is bone dry. The main engine/pump room has slight water ingress. Highly suspect from the gland nut seal of main shaft as no signs of water on the lid seal surrounding area of the transparent cover. Need to further address the seal leaks to minimum.

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                        Airplane gyro for the level planes and it functions as it is. Also shown the 12V auto windshield pump running on just 7.2V battery pack.

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                        Thats all for today.

                        Comment

                        • mloo123
                          Lieutenant
                          • Apr 2022
                          • 52

                          #42
                          Question.

                          Has anyone tried a 2.4ghz radio on rc subs before without any modifications on the antenna? Currently I'm using a spectrum 2.4ghz reciever (short antenna) with additional piggy-back satallite reciever (short antenna) and it seems it penetrates water quite well without any signs of glitches with full controls on every channel. Or is it because I'm not running deep or further distance away enough so it's normal for such radio system to operate?

                          Comment

                          • JHapprich
                            Captain
                            • Oct 2017
                            • 712

                            #43
                            You are not running deep enough and in clear water. You will be only able to operate at scope depth with anteann above the waterlevel.

                            Have you mesured the amps your waterpump draws?

                            I have some of those, but am reluctant to use install 'em as the specified power consumption by the vendor is rather high

                            Comment

                            • mloo123
                              Lieutenant
                              • Apr 2022
                              • 52

                              #44
                              Originally posted by JHapprich
                              You are not running deep enough and in clear water. You will be only able to operate at scope depth with anteann above the waterlevel.

                              Have you mesured the amps your waterpump draws?

                              I have some of those, but am reluctant to use install 'em as the specified power consumption by the vendor is rather high
                              The antenna is cables were always submerged at periscope depth in this case instead. When she fully dives just within 1' I can still operate the motors and drive planes which is new to me.

                              I didn't measure the current draws on the motor yet. Will do that and report back soon.

                              Comment

                              • mloo123
                                Lieutenant
                                • Apr 2022
                                • 52

                                #45
                                Added non functional bow planes. Also found a wooden cabinet hole plug which is perfect size for the rescue buoy raft!

                                Next will be final finishing black/red paint scheme.

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