Universal Joint problems

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  • DSC1
    Member
    • Oct 2013
    • 85
    #1

    Universal Joint problems

    I have a 6mm to 6mm universal joint that I use in a jet drive boat. The problem is the universal joint keeps coming apart like in the pic. I have it aligned very well to where I believe I could use a straight coupler. Is there any gain to going straight coupler? If you have any suggestions or recommendations I'm open to suggestions. It only seems to be a problem when I'm trying to get full throttle....Which is a big problem to me.

    20161002_201258_resized.jpg
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    • grsboats
      Senior Member
      • Jul 2012
      • 975
      #2
      Honestly I see no gain and no loss with a straight coupler.Years ago I built a mono using a CMB 45 coupled to a jet unit using a Graupner straight coupler with no issues.
      GO FAST AND TURN RIGHT !
      www.grsboats.com.br

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        • DSC1
          Member
          • Oct 2013
          • 85
          #3
          Originally posted by grsboats
          Honestly I see no gain and no loss with a straight coupler.Years ago I built a mono using a CMB 45 coupled to a jet unit using a Graupner straight coupler with no issues.
          Thanks. Guess I could make one of those myself since they aren't in stock currently. Unless you know some other place that sells them?

            Comment

            • 785boats
              Wet Track Racing
              • Nov 2008
              • 3169
              #4
              I think the problem is that you are most probably spinning that coupler at more revs than it was designed for. About 10,000 or 12,000 i think.
              we used to put a piece of heat shrink over the coupling to stop the pins from flying out when we knew we were exceeding their design limitations. That was with the red nylon ones.
              Here's a couple in my Higgins torpedo boat. I run those 700 series motors on 4s lipo these days.

              But if things are well aligned, a straight coupler might be better.
              Attached Files
              See the danger. THEN DO IT ANYWAY!!!
              http://forums.offshoreelectrics.com/...hp?albumid=319
              http://forums.offshoreelectrics.com/...hp?albumid=320

                Comment

                • DSC1
                  Member
                  • Oct 2013
                  • 85
                  #5
                  Originally posted by 785boats
                  I think the problem is that you are most probably spinning that coupler at more revs than it was designed for. About 10,000 or 12,000 i think.
                  we used to put a piece of heat shrink over the coupling to stop the pins from flying out when we knew we were exceeding their design limitations. That was with the red nylon ones.
                  Here's a couple in my Higgins torpedo boat. I run those 700 series motors on 4s lipo these days.

                  But if things are well aligned, a straight coupler might be better.
                  Guess I could try that to. Never even thought of trying that! Thanks.

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