How woul d you make the smallest SD that is reasonably possible?

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  • ben1272
    Lieutenant, Junior Grade
    • May 2020
    • 18

    How woul d you make the smallest SD that is reasonably possible?

    This is mostly meant to be a thought exercise, but I am genuinely curious what the best way is to make a very small, static dive-able, sub-driver. When I finally finish my Skipjack build, it is probably mostly going to get run in a swimming pool, but I am thinking that it is already a bit on the large size for my normal size pool. I figure there is a fun challenge to be had in making a much smaller sub to see what can be achieved in the way of performance. Like depth limits, speed under water, maneuverability under water, etc. A real small sub-driver that is not crazy hard to build would be useful for such a thing.

    I'm sure I'll have better ideas of my own once I have started using the Skipjack with its Dave M. sub-driver, but I like reading and learning from all you folk as well!

    Some great projects in this forum! Fun to read.

    -Ben
  • trout
    Admiral
    • Jul 2011
    • 3545

    #2
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    One inch tube - never again! That was an exercise in frustration and packing stuff in a small area.
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    If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.

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    • He Who Shall Not Be Named
      Moderator
      • Aug 2008
      • 12253

      #3


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      Who is John Galt?

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      • ben1272
        Lieutenant, Junior Grade
        • May 2020
        • 18

        #4


        Amazing. It is going to take some time for me to digest these! Are any of these SD units still available? How well did they work? As the subs get smaller (props, surfaces, etc) I am curious how performance suffered or not.

        Thanks for the quick replies!

        (edit: Sorry! I just noticed the youtube link and am watching it now)

        Comment

        • ben1272
          Lieutenant, Junior Grade
          • May 2020
          • 18

          #5
          Dave, that is some very impressive work. Your sub drivers have always amazed me, ever since I first saw them in action in Groton back in 1996 or so. I was hooked then, but too young to have the resources to put behind building a sub!

          What did you like/dislike about these designs?

          Comment

          • He Who Shall Not Be Named
            Moderator
            • Aug 2008
            • 12253

            #6
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            Who is John Galt?

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            • ben1272
              Lieutenant, Junior Grade
              • May 2020
              • 18

              #7
              I love that size. I'm going to have to take a look for one of these Revell Skipjacks. Dave, I think you have some sort of inner-watchmaker trying to find his way out of you! I love your innovation and craftsmanship, always have.

              So it looks like a crafty rare earth magnet interface for the dive planes, coupled through some sort of thin cover over the servo bay? Very innovative. I assume you were satisfied with the amount of force the magnets could sustain before disengaging.
              Last edited by ben1272; 05-17-2020, 06:44 PM.

              Comment

              • HardRock
                Vice Admiral
                • Mar 2013
                • 1609

                #8
                Also have a look at some of the tiny SD made by Zhuravlik.

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                This thing has a working blast system. They also make a much smaller one which is around four inches long; also with a working balst system.

                Comment

                • He Who Shall Not Be Named
                  Moderator
                  • Aug 2008
                  • 12253

                  #9
                  Originally posted by ben1272
                  I love that size. I'm going to have to take a look for one of these Revell Skipjacks. Dave, I think you have some sort of inner-watchmaker trying to find his way out of you! I love your innovation and craftsmanship, always have.

                  So it looks like a crafty rare earth magnet interface for the dive planes, coupled through some sort of thin cover over the servo bay? Very innovative. I assume you were satisfied with the amount of force the magnets could sustain before disengaging.
                  Watch-makers empty my privy!

                  Yes, as the inverse square law is not our friend it is vital to make the stand-off distance between the two magnets as short as possible. But, yes, this means of linkage has been most effective for the smaller models.

                  I illustrate my magnificence:


















                  Who is John Galt?

                  Comment

                  • HardRock
                    Vice Admiral
                    • Mar 2013
                    • 1609

                    #10
                    This broiught back some fond memories of cramming those tinly little servos into tubes and THEN discovering that when you cut the mounting ears of the little basyards they STOP working. I see your work around for that. Made me laught to think how long it took me to figure it out.

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                    • MFR1964
                      Detail Nut of the First Order
                      • Sep 2010
                      • 1290

                      #11
                      Or use the hull itself as the SD,

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                      The Biber can be splitted at the stern, she is secured watertight with some RTV as a seal, it can dive by speed, which does it remarkeble well.

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                      Pretty much the same story as the Biber, this Marder is also sealed by RTV at the rear-end and the frontcaps, surface runner only but fun to drive at that scale.

                      Manfred.
                      I went underground

                      Comment

                      • ben1272
                        Lieutenant, Junior Grade
                        • May 2020
                        • 18

                        #12
                        Dave...I am in even more awe than I had been in previously marveling at your 'conventional' sub-drivers and craftsmanship. These are truly gems and I am in love with that magnet concept. I hope I get the chance to try and make something like this.

                        Thanks for taking the time to post all these photos. I know it is a pain, and I appreciate it!

                        -Ben

                        Comment

                        • ben1272
                          Lieutenant, Junior Grade
                          • May 2020
                          • 18

                          #13
                          Manfred, that is an interesting mini sub specimen. Do you have any photos of its insides? :)

                          Comment

                          • MFR1964
                            Detail Nut of the First Order
                            • Sep 2010
                            • 1290

                            #14
                            Get seated, here we go.

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                            View to the stern, E motor inside, with a small transmission to get connection to the lower shaft.

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                            View to the bow, that aluminum frame is part of the seal, used only rtv to get the seal, those two holes are for screws, so you squize those frames together.

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                            Here you can see the split at the stern, a ESC made from a standard servo control print, 6 channel micro receiver and the two micro servo's for running the diveplanes and rudder.

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                            The servo's mounted inside their tray, ESC and receiver underneath, this was done as a trail for testing.

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                            Charging happens at the nose of the torps, which both hold the batteries, switching the boat on happens by using a reedswitch and a small magnet.

                            Those two bibers i have are the creation of my mentor, they are scale 1:35, i was only the one to get them back to live, and learned a lot about small boats during this process.

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                            Those are the components used inside the Marder, took them from a small toy boat.

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                            Turned both ends on the lathe, added enough rtv to seal them off, those motors are cheap enough to replace them when needed.

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                            By unscrewing the detonaters a can charge the boat, both points are secured by a diode, so you can only charge in one direction.

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                            Stranded at a beach in Italy, a boat fun to drive, only remark is the range, that toy transmitter allows me about 3 meters of range at the surface.

                            Manfred.

                            I went underground

                            Comment

                            • george
                              Captain
                              • Dec 2010
                              • 727

                              #15
                              Originally posted by He Who Shall Not Be Named

                              Watch-makers empty my privy!

                              Yes, as the inverse square law is not our friend it is vital to make the stand-off distance between the two magnets as short as possible. But, yes, this means of linkage has been most effective for the smaller models.

                              I illustrate my magnificence:


















                              Hello Sir

                              I have gone through your posts here about the SMALL WTC BUT I can`t find it in the Nautilus Drydock Store. Is it still available? I have a 1/35 German Seehund XXVIIB/B5 Midget Submarine that I would love to make into a Static diver in the basic air bag system and this WTC should be able to do it. I have the parts collected, just need the WTC.
                              Any help would be appreciated.
                              Thanks in advance for your help.

                              Comment

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