STS-250 Shaft Tube Seal .250

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  • ReddyWatts
    Fast Electric Addict!
    • Apr 2007
    • 1711

    #1

    STS-250 Shaft Tube Seal .250

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  • properchopper
    • Apr 2007
    • 6968

    #2
    Here's the breakdown :

    A bearing is used so the other side of the piece with the o-ring rotates with the flex (preventing o-ring wear):
    DSC05591.JPG


    The o-ring side :
    DSC05592-1.JPG


    exploded view :
    DSC05590.JPG






    In place :
    DSC05589.JPG


    Also has a lube port, and the retainer ring set-screws to the flex to hold all three pieces together and as a byproduct it retains the flex if it comes loose from the collet



    Rather clever !!
    2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
    2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
    '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

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    • longballlumber
      Fast Electric Addict!
      • Apr 2007
      • 3132

      #3
      Where is my buddy Jimmy when I need'm... (inside joke)

      That system is very dependent that you don't have a collet with horrible run-out (or misalignment for that matter)! Otherwise it's going to translate all of the misalignment into the stuffing tube, shaking the dog poo out of the stuffing tube/rest of the hull.

      Later
      Ball

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      • jfrancisco892
        Senior Member
        • Feb 2012
        • 546

        #4
        Don't get me started on runout lol.

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        • ron1950
          Fast Electric Addict!
          • Aug 2010
          • 3024

          #5
          I like it...there is a .187 version also
          MY RETIREMENT PLAN?????.....POWERBALL
          74 vintage kirby clasic hydro, pursuit mono, mg, 47'' mono, popeye hydro...

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          • kfxguy
            Fast Electric Addict!
            • Oct 2013
            • 8746

            #6
            Originally posted by ron1950
            I like it...there is a .187 version also


            I was thinking about trying one but I wasn't sure if it was extra drag. If not I'll put on on all my boats. Anyone know if it's more drag?
            32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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            • properchopper
              • Apr 2007
              • 6968

              #7
              Originally posted by kfxguy
              http://kintecracing.com/

              I was thinking about trying one but I wasn't sure if it was extra drag. If not I'll put on on all my boats. Anyone know if it's more drag?
              Since the o-ring does not stand still with the flex rotating inside of it (see post #2)- it rotates with the flex, the only "drag" is that of the ball bearing. The only downside I can potentially see is that the retaining ring setscrews to the flex and has to be loosened to pull/lube the flex each time.
              2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
              2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
              '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

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              • properchopper
                • Apr 2007
                • 6968

                #8
                Originally posted by ron1950
                I like it...there is a .187 version also
                DSC05775.JPG
                2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
                2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
                '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

                Comment

                • SloHD
                  Slow Electric Addict!
                  • Apr 2013
                  • 337

                  #9
                  Originally posted by properchopper
                  Since the o-ring does not stand still with the flex rotating inside of it (see post #2)- it rotates with the flex, the only "drag" is that of the ball bearing. The only downside I can potentially see is that the retaining ring setscrews to the flex and has to be loosened to pull/lube the flex each time.
                  Isn't that the point of the grease fitting though? I've never had a boat with a grease fitting so excuse my ignorance...

                  Comment

                  • ron1950
                    Fast Electric Addict!
                    • Aug 2010
                    • 3024

                    #10
                    hey tony have you tried this thing yet? what ya think?
                    MY RETIREMENT PLAN?????.....POWERBALL
                    74 vintage kirby clasic hydro, pursuit mono, mg, 47'' mono, popeye hydro...

                    Comment

                    • properchopper
                      • Apr 2007
                      • 6968

                      #11
                      Originally posted by ron1950
                      hey tony have you tried this thing yet? what ya think?
                      Not yet - none of my boats get water up the shaft. I have a build coming up soon where I'll use it 'tho
                      2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
                      2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
                      '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

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                      • Allrc
                        Member
                        • May 2010
                        • 84

                        #12
                        I got a mess of these in and they sold out very quickly. I'm waiting for more. My experience with them says;
                        1. I found its much better with a 50/50 mixture of ATF and a heavy oil like STP between runs. I don't like putting actual lithium grease through it. (Or any other oiler I've ever used)
                        2. I found they work best with a clamp on collet as opposed to a floating square drive like I use in my nitro 1/8 scale. If you use on a square drive the cable clamp moves slightly as the cable floats. I don't like that.

                        Remy put a lot of thought into these and I think he found a winner.

                        Bill Brandt

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                        • kevinpratt823
                          Fast Electric Addict!
                          • Aug 2012
                          • 1361

                          #13
                          If it would work with grease I'd jump on it. Perhaps you could squeeze it in while you rev the prop a bit to let the shaft work it down into the tube. I put a stuffing tube bracket with an oiler/reservior setup in my Sniper, and I don't use it now. I found that on the first run the oil/ATF would break down any grease in there and the flex would come out clean and somewhat dry, while I could do 2-3 runs with grease alone and still have a good layer in there when I was done.
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                          • devo
                            Senior Member
                            • Aug 2012
                            • 146

                            #14
                            I just installed two of the .187 size ones on my fantasm and I like them pretty well other than when you go to put oil in the nipple some of it always pushes it's way through the actual bearing itself and comes out inside of the boat. I only have run these on the bench so far but my drive line seems nice and smooth and the resistance was very minimal. I will report more on these after I actually run them in the lake this weekend. I also didnt mention that you need to debur the insides of these before installation as there was some loose aluminum in both of mine that was left from machining.

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                            • devo
                              Senior Member
                              • Aug 2012
                              • 146

                              #15
                              Okay, I've had enough runs with the stuffing tube seals now to say that im anfan of them and will install them on most if not all of my future builds. Ive spun them at over 35k rpms and had no problems or water intrusion from the stuffing tube. I just wish someone would get the .187ones in stock again so that I can order more

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