How could this happen?

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  • zooma
    Local club FE racer
    • May 2014
    • 650

    #1

    How could this happen?

    Third run on a new shaft. Twisted up at full throttle. The only thing I can think of is too much space between the collet and stuffing tube.

    Twisted shaft.JPG
    Ron - The Villages, FL

    https://castawaysboatworx.org/
  • koen
    Senior Member
    • Mar 2020
    • 358

    #2
    Hi ron was there enuf space between the drive dog and the stinger/strut?it looks like the flexshaft/propshaft bind somewhere

    Comment

    • larryrose11
      Senior Member
      • Jun 2010
      • 757

      #3
      You ARE CORRECT SIR!!
      See thee flare on the end of the stuffing tube? The shaft went into a Jump Rope sort of harmonic, and that was the result.
      Cheetah, Super Rio, (Mod) Starship (Mod and sold),

      Comment

      • Fluid
        Fast and Furious
        • Apr 2007
        • 8012

        #4
        This is more common than many realize, I’ve seen it often. Ideally there should be no more than 3/8” to 1/2” between the collet and the end if the stuffing tube, especially with high power setups. The stuffing tube should be supported near its inboard end too, not hanging in the air. It’s FE 101.




        .
        ERROR 403 - This is not the page you are looking for

        Comment

        • Johnc
          Senior Member
          • Aug 2015
          • 199

          #5
          looks to me the stuffing tube support broke loose (wrong type of epoxy?) then went all to hell after that. And like Fluid said too much spacing between collet and stuffing tube.

          Comment

          • zooma
            Local club FE racer
            • May 2014
            • 650

            #6
            Thanks, guys. I like the jump-rope analogy.

            And, now for the rest of the story. Last month, at the Atlanta races, on the second heat the motor mount broke loose and snapped the shaft and buggered up the stuffing tube. Part of the repair included removing the damaged part of the tube with a Dremel cut-off wheel. So it lasted for two more heats, but eventually gave out back home at the club lake. Lesson learned.
            Ron - The Villages, FL

            https://castawaysboatworx.org/

            Comment

            • larryrose11
              Senior Member
              • Jun 2010
              • 757

              #7
              On this, when you make the stuffing tube repair, install a nested tube.
              that way, only a short section of outer tube gets glues to the hull.
              The actual stuffing tube just slides in.
              Makes repairs a snap.
              Cheetah, Super Rio, (Mod) Starship (Mod and sold),

              Comment

              • zooma
                Local club FE racer
                • May 2014
                • 650

                #8
                Originally posted by larryrose11
                On this, when you make the stuffing tube repair, install a nested tube.
                that way, only a short section of outer tube gets glues to the hull.
                The actual stuffing tube just slides in.
                Makes repairs a snap.
                I don't quite understand. The proper size tube is 1/4", to fit into the stinger and hold a .187 shaft without a Teflon liner. So one length goes from the stinger all the way up to the collet. How does the nested one work?
                Ron - The Villages, FL

                https://castawaysboatworx.org/

                Comment

                • tbonemcniel
                  Senior Member
                  • Sep 2020
                  • 296

                  #9
                  Originally posted by zooma
                  I don't quite understand. The proper size tube is 1/4", to fit into the stinger and hold a .187 shaft without a Teflon liner. So one length goes from the stinger all the way up to the collet. How does the nested one work?
                  Put like 1" of the next largest size tube. All the K&S sizes telescope within the next larger and smaller sizes.

                  Comment

                  • zooma
                    Local club FE racer
                    • May 2014
                    • 650

                    #10
                    Originally posted by tbonemcniel
                    Put like 1" of the next largest size tube. All the K&S sizes telescope within the next larger and smaller sizes.
                    I see
                    Ron - The Villages, FL

                    https://castawaysboatworx.org/

                    Comment

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