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Balancing WTC

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  • Balancing WTC

    Was watching this Korean guy building a WTC intended for a 1/144 Kilo. In the video he adjust the "locations" of the weights on the outside of the WTC to make it go down level.

    Aren't you suppose to do trimming/ballasting with the WTC INSIDE the hull?
    Last edited by redboat219; 04-26-2022, 07:29 AM.
    Make it simple, make strong, make it work!

  • #2
    It could be that he wanted to show the WTC diving and surfacing by itself for the purpose of the video.

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    • #3
      Yeah, that's what I was thinking. Could also be he is thinking that if the cylinder is perfectly balanced, it makes balacing the sub as a whole easier?

      My guts says option 1...

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      • #4
        Also...It could be that he doesn't have a hull for it yet- now he's got to go out and find a 1/144 Kilo..
        Last edited by Bob Gato; 04-27-2022, 04:38 PM.

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        • #5
          Here's a solution to tiver's leaking piston balast: https://www.thingiverse.com/thing:125529 (no more threads to seal)

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          • #6
            Originally posted by TuptubBuilder View Post
            Here's a solution to tiver's leaking piston balast: https://www.thingiverse.com/thing:125529 (no more threads to seal)
            Wow.. that is cool, but I have reservations about applicability in a piston tank. The pressure against the face of the piston is pretty massive. That setup would need to be insanely tight-fitting to get adequate grip on that shaft, and constant use will wear both the bearings and shaft to the point that you'll get slippage eventually.

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            • #7
              I agree that this is not the most practical solution. I think the Europeans have the best ballast system for this size cylinder (Peristaltic/bladder).Having said that, Amacoil make a commercial linear drive. The RS3-10-4 would fit inside a 2” diameter cylinder. The maximum thrust of the RS-10-4 is 22.48 lb. That would be 7.16 psi ignoring the shaft diameter. Water pressure at 10’ is 4.33 psi. So it’s doable but not worth the effort

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              • #8
                Bob, after some more number crunching I completely get your point and stand corrected. Not to induce yawning but I found that the max pressure limit of a 60 ml syringe is at least 100 psi. Using a 4mm threaded rod and gear motor producing at least 5.5 oz-in, a conventionally configured piston tank could operate at a maximum depth of 50'. This is much greater than what the threadless lead screw could achieve.

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                • #9
                  Originally posted by TuptubBuilder View Post
                  Bob, after some more number crunching I completely get your point and stand corrected. Not to induce yawning but I found that the max pressure limit of a 60 ml syringe is at least 100 psi. Using a 4mm threaded rod and gear motor producing at least 5.5 oz-in, a conventionally configured piston tank could operate at a maximum depth of 50'. This is much greater than what the threadless lead screw could achieve.
                  Even I am bound to get some things right sometimes! :)

                  Bob

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