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Suggestions for a line release mechanism, please ?

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  • Suggestions for a line release mechanism, please ?

    Hello all. New here and impressed by your work.

    Looking at the web for varied mechanisms, found this forum with lots of skills and experience.
    Am after a cord/line/string release mechanism and would like your suggestions.

    The intention is to release a string length tied to a float that would reach surface on command. The 'bottom' end of the string having a ring, the 'top' end of the string a buoy. The assembly carried underwater until released launching the float upwards with the string hanging below.

    A simpler way to explain... You are at your backyard holding a helium balloon by a ring at the end of its string. Release it.

    If possible, the actuator for the release mechanism inside a hermetic chamber. (Trough wall action with no openings)

  • #2
    Solenoid actuated bell-crank in the wet.

    "... well, that takes care of Jorgenson's theory!"


    • #3
      Thank you. Do you know if an assembly of a wet bell-crank driven by a dry solenoid is available somewhere ? Or is it a do-it-myself ?


      • #4
        Originally posted by Externet View Post
        Thank you. Do you know if an assembly of a wet bell-crank driven by a dry solenoid is available somewhere ? Or is it a do-it-myself ?
        It's a do it yourself. Find a DC solenoid that works off the voltage of your main power supply; put a boot type seal between the solenoid body and actuating slug; slather the entire unit in silicon sealant, and you have a water-tight unit.

        Here are some water-tight seal options for you:

        "... well, that takes care of Jorgenson's theory!"


        • #5
          Thanks again, good clues.
          I was aiming for the magnetic field to actuate the bell-crank trough a sealed dry chamber wall (no holes at all) but seems I should settle with a bellows. The solenoid pulling a plate inside the bellows end and the bellows outside to do the triggering. Will refine thoughts... I should be careful with a sealed bellows to not collapse at depth and produce unwanted movement.


          • #6
            Maybe a electric magnet. When your batter dies it releases the buoy or failsafe cuts off power.
            If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.


            • #7
              David did create this magnetic coupling on a Subdriver.

              Click image for larger version

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