Help with my first twin boat, dont know the way they should spinn and who prop

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  • shua
    Senior Member
    • Apr 2015
    • 479

    #16
    Maybe consider a bolt or screw... the threads twist in one direction. If you lay/compare the flex shaft to the bolt/screw you will see if the flex is twisting same direction (Clockwise "CW") or the flex shaft is opposite (Counter or Anti Clockwise "CCW")
    Then you would want your motor to "tighten" the "bolt"(flex shaft) and turn the prop the same direction.

    Comment

    • waterproof
      Senior Member
      • Jul 2013
      • 239

      #17
      Hi again :) I going to try to explane.

      I wrote this:
      This was not easy to understand for me, if i change side on the flex on the first pics, then the motor should spinn it the other way that the wires are twisted?
      Look at my last pics, everything like before but i changed prop sides.
      Should the flex spinn the same way like they are twisted or not? If it the same way like they are twisted then the pics shows it right from the beginning, or is this wrong so i must change the flex shafts?

      Then you wrote this:

      Originally posted by tlandauer
      No, this is wrong, you will loosen the "twist strands of the flex."
      Close your eyes and imagine.......
      I Wonder what of it was wrong since i got 2 question :)
      Like i said it would be normal that the right motor spinn to right and left motor spin to left, and the shafts must be twisted the same rotation as it going to spin to not get loose wires?

      understand that the prop could be both way and its just about speed and preformence? But the most important ting is to Mount the flex shaft With the twisted wires in right directions.
      I post a pics of it, my right motor spins against right and left against left (anticlockwise)
      Is it the right way to Mount this flex shaft when my motor are spinnin like they do?
      Her is a pics
      20150612_203153_003_resized.jpg
      Is it not a video some Place or pics that showing what is right rotation to the flexshafts?
      I could also make a video and show if that could help?

      Comment

      • shua
        Senior Member
        • Apr 2015
        • 479

        #18
        If the red arrows is motor rotation than the flex shafts are opposite. Move flex shaft to other sides.

        Comment

        • kevinpratt823
          Fast Electric Addict!
          • Aug 2012
          • 1360

          #19
          Originally posted by shua View Post
          Maybe consider a bolt or screw... the threads twist in one direction. If you lay/compare the flex shaft to the bolt/screw you will see if the flex is twisting same direction (Clockwise "CW") or the flex shaft is opposite (Counter or Anti Clockwise "CCW")
          Then you would want your motor to "tighten" the "bolt"(flex shaft) and turn the prop the same direction.
          A great analogy, but I think you have it backwards. If the flex we're a bolt, when the shaft/bolt turned a nut would move towards the prop end of the shaft.......just like the "threads" force the grease out towards the prop. If a flex is installed backwards the excess grease comes back up the tube into the boat.

          Sent from my SM-G920V using Tapatalk
          Last edited by kevinpratt823; 06-13-2015, 10:48 AM.
          My private off road rc track
          https://www.youtube.com/watch?v=XC3H...yaNZNA&index=8

          Comment

          • kevinpratt823
            Fast Electric Addict!
            • Aug 2012
            • 1360

            #20
            Warerproof, I will take some pictures for you when I get home from work.

            Sent from my SM-G920V using Tapatalk
            My private off road rc track
            https://www.youtube.com/watch?v=XC3H...yaNZNA&index=8

            Comment

            • tlandauer
              Fast Electric Addict!
              • Apr 2011
              • 5660

              #21
              Waterproof, i should have never mess up this thread, I think my towel twisting analygy is correct, but my #12 post is incorrect, it's time for me to sleep, lol...
              Kevin, my sincere apologies!
              Too many boats, not enough time...

              Comment

              • waterproof
                Senior Member
                • Jul 2013
                • 239

                #22
                That would be great. Thankfull for that. I could also post pics with the flex mounted to the boat when i get home today :-)

                Comment

                • shua
                  Senior Member
                  • Apr 2015
                  • 479

                  #23
                  Originally posted by kevinpratt823 View Post
                  A great alalogy, but I think you have it backwards. If the flex we're a bolt, when the shaft/bolt turned a nut would move towards the prop end of the shaft.......just like the "threads" force the grease out towards the prop. If a flex is installed backwards the excess grease comes back up the tube into the boat.

                  Sent from my SM-G920V using Tapatalk
                  True. The confusion starts when you are sitting behind the boat looking at the transom. Then everything gets reversed. (i think edited that post about three times because it was starting to confuse me! Lol)

                  Comment

                  • TRUCKPULL
                    Fast Electric Addict!
                    • Apr 2007
                    • 2971

                    #24
                    You are using a left and a right hand prop.

                    To make sure that you have the correct prop with the correct shaft.
                    Look at the picture below, The angle of the twist in the wires is in the same direction as the prop blade.

                    Larry
                    Attached Files
                    Past NAMBA- P Mono -1 Mile Race Record holder
                    Past NAMBA- P Sport -1 Mile Race Record holder
                    Bump & Grind Racing Props -We Like Em Smooth & Wet

                    Comment

                    • waterproof
                      Senior Member
                      • Jul 2013
                      • 239

                      #25
                      Hello.

                      Thanks Truckpull, now i see that the prop should point the same side as the wire, but i are realy comfused about how the flex shaft should spinn.

                      Here is a pics that i have zoomed in and remember my right motor spin to right with the clock and the left motor spin to the left anti clockwise.
                      The same side as i have lay them on the white A4 paper on the desk on the pics last pics i posted up here.

                      kevinpratt823: Very happy and Nice of you if you could post pics of Your boat and tell me what way the motor spins.
                      I did not get it on water yesterday eighter, must wait for help With this flex rotation stuff :)

                      zoomet.jpg

                      the flex on the right side point like this //// and left motor side the wire point like this \\\\ and remember my right motor spinn to right With the clock and left motor spinn to left anti clockwise.

                      Comment

                      • kevinpratt823
                        Fast Electric Addict!
                        • Aug 2012
                        • 1360

                        #26
                        That picture looks correct if you spin the right motor right with the clock, when looking from the rear.

                        Most people run there motors the other way, you would have to swap shafts to do that.

                        Either way, truck pull's picture shows you how the shaft should look in relation to the prop, and that is the important part for now. It is basically the same as what I was going to show you.

                        Sent from my SM-G920V using Tapatalk
                        My private off road rc track
                        https://www.youtube.com/watch?v=XC3H...yaNZNA&index=8

                        Comment

                        • TRUCKPULL
                          Fast Electric Addict!
                          • Apr 2007
                          • 2971

                          #27
                          Originally posted by waterproof View Post
                          Hello.

                          Thanks Truckpull, now i see that the prop should point the same side as the wire, but i are realy comfused about how the flex shaft should spinn.

                          Here is a pics that i have zoomed in and remember my right motor spin to right with the clock and the left motor spin to the left anti clockwise.
                          The same side as i have lay them on the white A4 paper on the desk on the pics last pics i posted up here.

                          kevinpratt823: Very happy and Nice of you if you could post pics of Your boat and tell me what way the motor spins.
                          I did not get it on water yesterday eighter, must wait for help With this flex rotation stuff :)

                          [ATTACH=CONFIG]133181[/ATTACH]

                          the flex on the right side point like this //// and left motor side the wire point like this \\\\ and remember my right motor spinn to right With the clock and left motor spinn to left anti clockwise.

                          You can change the turning direction of any motor at any time to match the prop that you want on that motor,
                          By Swapping any two wires on the brushless motors.

                          Always keep the props and shafts together as in my picture below.

                          Larry
                          Attached Files
                          Past NAMBA- P Mono -1 Mile Race Record holder
                          Past NAMBA- P Sport -1 Mile Race Record holder
                          Bump & Grind Racing Props -We Like Em Smooth & Wet

                          Comment

                          • waterproof
                            Senior Member
                            • Jul 2013
                            • 239

                            #28
                            Thank you. That is correct but i could only drive it for about 2 minutes before the left prop stopped.
                            It is the part two of the flex system, the end on the flex with four sides seems to be to small so its just spinning around inside the strut.
                            I will post Picture of it. Its real boring. What could i do with it? Must have a new flex shaft?

                            Comment

                            • waterproof
                              Senior Member
                              • Jul 2013
                              • 239

                              #29
                              Originally posted by kevinpratt823 View Post
                              That picture looks correct if you spin the right motor right with the clock, when looking from the rear.

                              Most people run there motors the other way, you would have to swap shafts to do that.

                              Either way, truck pull's picture shows you how the shaft should look in relation to the prop, and that is the important part for now. It is basically the same as what I was going to show you.

                              Sent from my SM-G920V using Tapatalk
                              Im very glad for your support. Its not easy to be new with dual motors. But like i said it dosnt last long. The four edge flex on left just slipp/slide into the stinger. Always when i bough something new it must be something that does so the boat stands on the table.. It must be to thin from the factory or the stinger is broken or littlebit to big.. Is it a way i could drive it before i try a new flex shaft?

                              Comment

                              • kevinpratt823
                                Fast Electric Addict!
                                • Aug 2012
                                • 1360

                                #30
                                What does the square end of the flex look like? Is it damaged/worn? Did you cut it too short?
                                My private off road rc track
                                https://www.youtube.com/watch?v=XC3H...yaNZNA&index=8

                                Comment

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