flex shaft problems....

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  • screwball
    Senior Member
    • Jul 2009
    • 464

    #1

    flex shaft problems....

    i keep on having problems loosing flex shafts on my boats and im getting tired of it.

    i always tighten down everything and double check all the screws or bolts but then outta the blue the boat just stops and i can hear the motor or engine keep on reving but the boat isnt moving.
    i just want to ask you guys if you have any tricks on making sure that the shaft doesnt fall out. the only thing ive thought of is putting a drive dog on the shaft in front of the stuffing tube to keep it from going any further but idk...


    thanks!
    James
  • domwilson
    Moderator
    • Apr 2007
    • 4408

    #2
    That sounds like a good idea but I would try to find out why you keep loosing shafts. Maybe a wrong or bad coupler? Are the ends of your shaft solid.....that sounds bad...soldered?
    Government Moto:
    "Why fix it? Blame someone else for breaking it."

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    • screwball
      Senior Member
      • Jul 2009
      • 464

      #3
      yea all of my shafts are soldered and the couplers are all the correct size. they just seem to keep on loosening up and i have almost zero vibration so ive ruled that out...

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      • egneg
        Fast Electric Addict!
        • Feb 2008
        • 4670

        #4
        I have had problems with wire drives so I use wheel collars from the airplane section.
        IMPBA 20481S D-12

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        • jlr3rd1
          Senior Member
          • Oct 2008
          • 240

          #5
          i had same problem i replaced the colletor nut, and had same problem??? i used 3m threadlocker blue and had not had problem since
          2 SV27s, 1 SV27r, 2 BLACKJACKS 26, 1 GENESIS 40

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          • Fluid
            Fast and Furious
            • Apr 2007
            • 8012

            #6
            The safety solution is to use a wheel collar on the cable up tight against the coupler. I assume you are using a set screw coupler - IME these are prone to losing cables unless they are designed and tightened correctly. You may think you have no vibration, but believe me when the prop blades slap the water they set up some awesome driveline vibrations. A collet-type coupler may fit your style better.





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            • screwball
              Senior Member
              • Jul 2009
              • 464

              #7
              thanks for all the replies guys!!!!
              can someone throw me a link to the wheel collar
              and ive lost cables on both style couplers


              thanks
              James

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              • Rumdog
                Fast Electric Addict!
                • Mar 2009
                • 6453

                #8
                If you use a collet type coupler, there is not any way you should lose the flex....If it's the right size. I'd dpuble check the setup. I've never lost a flex using a collet. Pics?

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                • screwball
                  Senior Member
                  • Jul 2009
                  • 464

                  #9
                  the collet one was on my nitro so i was thinking that it was possibly the vibrations from the motor loosening it...

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                  • domwilson
                    Moderator
                    • Apr 2007
                    • 4408

                    #10
                    Maybe a short piece of tight fitting fuel tubing on the flex before the strut? It could easily be removed for maintenance and should prevent you from losing the shaft. Just an idea.
                    Government Moto:
                    "Why fix it? Blame someone else for breaking it."

                    Comment

                    • Fluid
                      Fast and Furious
                      • Apr 2007
                      • 8012

                      #11
                      Tower Hobbies carries an expansive collection of RC cars, RC airplanes, RC boats, model trains, sot cars, and supplies for all hobbyists.



                      Fuel tubing can work in a pinch, but if your shaft rpm is high it can balloon out and break.

                      Collet couplers need to be lubricated to work correctly. A touch of Never-Seeze or similar anti-galling lube on the threads allows you to tighten the nut more, giving a better grip on the cable. But it is possible to over-tighten and break a collet, just like you can strip a setscrew.






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                      • screwball
                        Senior Member
                        • Jul 2009
                        • 464

                        #12
                        fuel tubing is a great idea!!!! and i`ll try that on my collet couplers thats also a great idea! lol


                        thanks guys!!!
                        James

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