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Underwater sounding device

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  • Underwater sounding device

    Before I start designing something myself I'll ask. And I have not looked around yet. Is there a waterproof device that emits a sound, something like a ping, does not need to be a continuous sound, that can be used to locate a down submarine model? A sound that is not annoyingly loud that is enough that can be heard when you dip your ears underwater. Something tiny enough that would use maybe a coin size battery.

  • #2
    Couple of articles from AMS
    https://www.theassociationofmodelsub...trasonic#10016

    https://www.theassociationofmodelsub...nd-hydrophones
    Make it simple, make strong, make it work!

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    • #3
      Building a waterproof audible transmitter is not difficult. You can find plenty of low voltage piezo-electric units @ digi-key.
      Here's but one: PT-2725WQ Mallory Sonalert Products Inc. | Audio Products | DigiKey

      Locating the direction of the sound is several orders of magnitude more complex. Immersing your ear(s) in the water won't do much of anything; you can get the same effect with a long tube.

      (Putting on my sonarman's hat now) . . . Sound travels four times faster through water than air, but because of the way it propagates, your chances of locating the source in 3 dimensions is slim to none. For that, you need a directional receiver with the means to detect the changing amplitude of the source as you sweep in bearing and azimuth.

      A far more efficient way of finding a bottomed boat is with high-intensity strobes or LEDs. Useless in murky water, where a released buoy on a tether would be more practical.

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      • #4
        something else that might be more fun than mounting a Ping is Dolphin Ear http://www.dolphinear.com/ - you could drop that in pool / pond side and listen passively.
        You could listen to your subs / targets / background noise and even generate the sonar waterfall type display - OR maybe even listen to an onboard pinger.
        John Slater

        Sydney Australia

        You would not steal a wallet so don't steal people's livelihood.
        Think of that before your buy "cheap" pirated goods or download others work protected by copyright. Theft is theft.



        sigpic

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        • #5
          Ken,

          For Marlin, I would go with a marker buoy. She's already got the aft buoy in a great exposed location! Build a hollow buoy and fab up a spool filled with, say 20' of 2 lb test mono fishing line, attach one end to hull, the other to the buoy. There's room in the superstructure back there. Or, even up forward, where you already have that hatch where the buoy would be. The trick is coming up with a failsafe type of release mechanism. There are discussions about such things in these forums. You just gotta find something that suits your requirements. I trust that with your skills, something slick will arrive in short order!! Nice seeing you this past weekend!

          Bill

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          • #6
            Originally posted by wlambing View Post
            Ken,

            For Marlin, I would go with a marker buoy. She's already got the aft buoy in a great exposed location! Build a hollow buoy and fab up a spool filled with, say 20' of 2 lb test mono fishing line, attach one end to hull, the other to the buoy. There's room in the superstructure back there. Or, even up forward, where you already have that hatch where the buoy would be. The trick is coming up with a failsafe type of release mechanism. There are discussions about such things in these forums. You just gotta find something that suits your requirements. I trust that with your skills, something slick will arrive in short order!! Nice seeing you this past weekend!

            Bill
            Tethered buoys are only good for getting fouled in the propeller(s) when they deploy accidently (and they WILL!), and present an added complexity to an already maintenance heavy vehicle. Sound and lights is the ticket. From a guy who's probably put in more in-water toy-submarine salvage time than this entire group combined.

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            David
            Resident Luddite

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            • #7
              Hello David,

              Could I get your opinion on some hull mold questions over at "tool time" please?

              Thank you

              David h

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              • #8
                Originally posted by Davidh View Post
                Hello David,

                Could I get your opinion on some hull mold questions over at "tool time" please?

                Thank you

                David h
                ... I just got back late last night from the Groton event. I gave your post a quick look this morning and like what I see in your sketches. I'll give my full attention to your questions tomorrow, David.

                David
                Resident Luddite

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                • #9
                  Thanks David,

                  Standing by.

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