Alternatives for Dumas Cup style coupler

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  • redboat219
    Admiral
    • Dec 2008
    • 2723

    Alternatives for Dumas Cup style coupler

    What would be a good alternative to the Dumas cup style coupler. I can not find a local source and the ones from China meant for RC car either have a 5mm hole for the shaft or a solid shaft. Click image for larger version

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    Last edited by redboat219; 12-03-2023, 05:30 AM.
    Make it simple, make strong, make it work!
  • Subculture
    Admiral
    • Feb 2009
    • 2114

    #2
    1 Shaft Connector Universal Joint. This universal joint is made of stainless steel, durable and practical. Material: stainless steel. 4x4mm is suitable for FT011. 4x4mm ( for FT011 ).

    Comment

    • Subculture
      Admiral
      • Feb 2009
      • 2114

      #3
      If you're looking for imperial, it'll be much more difficult to find anything outside the US. Easier to either convert the shafts to metric, or sleeve a larger metric coupling to fit.

      Comment

      • redboat219
        Admiral
        • Dec 2008
        • 2723

        #4
        Thanks Subculture but the SD output shaft is 1/8".
        Make it simple, make strong, make it work!

        Comment

        • Subculture
          Admiral
          • Feb 2009
          • 2114

          #5
          Then you'll have to take into account what I said in my second post.

          Comment

          • Ken_NJ
            Captain
            • Sep 2014
            • 735

            #6
            Have a lathe? Chuck it up and you can bore a smaller one out to a larger size and go from metric to imperial.

            We are talking about lathes in Dive Tribe. Part one was this past Saturday. Good stuff!!!!

            Comment

            • Subculture
              Admiral
              • Feb 2009
              • 2114

              #7

              Comment

              • redboat219
                Admiral
                • Dec 2008
                • 2723

                #8
                Thank you.
                Make it simple, make strong, make it work!

                Comment

                • Albacore 569
                  Commander
                  • Sep 2020
                  • 301

                  #9


                  I am happy with these. Shaft couplers from Harbor Models. Attach one end to your WTC, and the other brass connector to the fixed prop shaft aft. adjust the shaft length so you simply slide the brass grooved part into the red grooved plastic coupler when sliding the WTC into place in hull.

                  You can order from Harbor models specifying different shaft diameters. same size on each - like 4 or 5 mm, or different, a 4 mm on one end and a 5 mm on the other end. They also sell a universal brass grooved connector that's male on each end too.

                  Harbor models' prices are a bit more. The couplers too. But not too bad. But how many couplers does one need in their lifetime unless you're a manufacturer.

                  They run smooth and very balanced and quiet operating. (hope you don't mind Bob, the boys on the sub tender parked alongside changed out the dog bone...lol)





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                  Last edited by Albacore 569; 12-03-2023, 07:55 PM.

                  Comment

                  • Subculture
                    Admiral
                    • Feb 2009
                    • 2114

                    #10
                    They're generally known as Huco couplings here in the UK, after the company that first produced and marketed them, but they're also sold by Raboesch and quite a few cloned versions too.

                    Okay for lower RPM use, but they are quite bulky so less well suited to some smaller boats. Also being a Hooke's joint they're not a constant velocity design, so will impart more vibration into the assembly unless the joint is very well aligned. Running a pair like your photo helps reduce the effects of that.

                    There are ball/dogbone type couplings available on the same splined boss system from Raboesch. e.g. https://www.cornwallmodelboats.co.uk...B101_01_V.html

                    Comment

                    • redboat219
                      Admiral
                      • Dec 2008
                      • 2723

                      #11

                      From Nate He. LEGO universal joint. Click image for larger version  Name:	FB_IMG_1701652307289.jpg Views:	0 Size:	70.7 KB ID:	176294 Click image for larger version  Name:	20231204_124957.jpg Views:	0 Size:	51.4 KB ID:	176296
                      Make it simple, make strong, make it work!

                      Comment

                      • Subculture
                        Admiral
                        • Feb 2009
                        • 2114

                        #12
                        I would have thought you'll need some adaptors to convert the splined shaft to a round hole

                        Comment

                        • biggsgolf
                          Captain
                          • Jan 2020
                          • 704

                          #13
                          I like these if prop shaft is level to the bulkhead driveshaft
                          Click image for larger version

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                          Comment

                          • Subculture
                            Admiral
                            • Feb 2009
                            • 2114

                            #14
                            That's the coupling R&R supply with some of their kits. I think Ron may get them investment cast, possibly by Simon at Prop Shop.

                            You could make your own using wheel collets and some sheet stock or wire brazed or soldered on.

                            Comment

                            • biggsgolf
                              Captain
                              • Jan 2020
                              • 704

                              #15
                              Yes, he also sells them if he remembers to

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