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688i Propeller Ring?

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  • 688i Propeller Ring?

    General question - did all of the 688i's have a propeller ring like this one?

    -One of David"s photos:

    Click image for larger version  Name:	fetch?id=138022&d=1587055994.jpg Views:	0 Size:	85.3 KB ID:	149536
    Last edited by Slats; 05-03-2021, 03:01 AM.
    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

  • #2
    Eventually, yes.

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    • #3
      Was the ring added for cavitation reasons or because of a towed array?

      Comment


      • #4
        Originally posted by Monahan Steam Models View Post
        Was the ring added for cavitation reasons or because of a towed array?
        Not cavitation, but tip losses. And yes they could save the tow in a tight, low-speed turn or if the boat has to back down (In both cases, if possible, they would reel the two in first)

        I suspect -- but have never heard any authoritative confirmation -- the ring worked to stiffen the blades as the I's were upgraded to do under-ice work (the class design shift from fairwater planes to retractable bow plane).

        https://youtu.be/WOVYwwx6VD4 (0:35)

        David
        Resident Luddite

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        • #5
          Thanks David. I just learned something new. Good cat and mouse game in that video. The maneuverability of those subs is impressive.

          Nick

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          • #6
            Thanks guys - all great info - I love this hobby and its endless learning curve- its good to be back.
            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

            Comment


            • #7
              Originally posted by He Who Shall Not Be Named View Post

              Not cavitation, but tip losses. And yes they could save the tow in a tight, low-speed turn or if the boat has to back down (In both cases, if possible, they would reel the two in first)

              I suspect -- but have never heard any authoritative confirmation -- the ring worked to stiffen the blades as the I's were upgraded to do under-ice work (the class design shift from fairwater planes to retractable bow plane).

              https://youtu.be/WOVYwwx6VD4 (0:35)

              David
              Thanks David - great dope and video
              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

              Comment


              • #8
                Wow! I wish my sub ran that well!!!!

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