Blackjack dual rudder pickup upgrade

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  • REDLINE1
    Senior Member
    • Jul 2016
    • 199

    #1

    Blackjack dual rudder pickup upgrade

    Just finished my dual rudder water pickup upgrade. Installed an additional outlet on the other side of the boat so I have two separate lines for motor esc

    IMG_0048.jpg
    Attached Files
    Last edited by JimClark; 04-14-2017, 02:30 PM.
  • JimClark
    Fast Electric Addict!
    • Apr 2007
    • 5907

    #2
    What is having dual rudders going to do for the BJ
    "Our society strives to avoid any possibility of offending anyone except God.
    Billy Graham

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    • REDLINE1
      Senior Member
      • Jul 2016
      • 199

      #3
      Not duel rudders. A rudder with duel water pickups. It allows u to run two separate water lines one to cool the motor and one to cool the esc hopefully providing better cooling. On the stock setup with a single line water runs through the motor then continues on through the esc and out

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      • fweasel
        master of some
        • Jul 2016
        • 4279

        #4
        That's the M41 rudder?
        Vac-U-Tug Jr (13mph)

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        • Fluid
          Fast and Furious
          • Apr 2007
          • 8012

          #5
          ....On the stock setup with a single line water runs through the motor then continues on through the esc and out
          If yours was configured this way it was wrong. The water should always run through w ESC first, then the motor. Due to the short dwell time the water has in the ESC there is not a lot of heat removed by the water. Running the water stream to the motor next is more efficient than the other way around. If you want to run dual water lines that's fine, but don't expect a big difference in temps if ALL things remain the same. At least that's how it played out in my testing on a 10S boat.


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          • fweasel
            master of some
            • Jul 2016
            • 4279

            #6
            Originally posted by Fluid
            If yours was configured this way it was wrong. The water should always run through w ESC first, then the motor. Due to the short dwell time the water has in the ESC there is not a lot of heat removed by the water. Running the water stream to the motor next is more efficient than the other way around. If you want to run dual water lines that's fine, but don't expect a big difference in temps if ALL things remain the same. At least that's how it played out in my testing on a 10S boat.
            That boat was previously mine. After dialing in the setup on 6S with a 440/3 prop, the motor temps got much warmer, while the ESC temps remained similar to the previous prop I had run with a higher timing setting. I plumbed the motor in before the ESC and the motor temps improved on the following runs, with no real change to the ESC.
            Vac-U-Tug Jr (13mph)

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            • REDLINE1
              Senior Member
              • Jul 2016
              • 199

              #7
              Originally posted by fweasel
              That's the M41 rudder?
              It's the upgrade rudder OSE sells for the M41. Had to cut it down to match the length of the stocker then sandblast and paint

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              • REDLINE1
                Senior Member
                • Jul 2016
                • 199

                #8
                Originally posted by Fluid
                If yours was configured this way it was wrong. The water should always run through w ESC first, then the motor. Due to the short dwell time the water has in the ESC there is not a lot of heat removed by the water. Running the water stream to the motor next is more efficient than the other way around. If you want to run dual water lines that's fine, but don't expect a big difference in temps if ALL things remain the same. At least that's how it played out in my testing on a 10S boat.

                .
                Ya u maybe right but this same setup on my spartan helped. Gonna be running 6s so I thought I'd give it a try. Plus it gave me a project to do. I can't leave anything alone lol

                Comment

                • boatsrnew2me
                  Senior Member
                  • Oct 2016
                  • 476

                  #9
                  my motor hit 150 today on todays run . previously it was 135 but that was after like 2 minutes .this time was over 3 minutes until i tested . if motor temps dont improve i foresee another motor in my future .
                  volantex vector pro ,proboat veles 29 , traxxas spartan, hobbyking/tfl pursuit ,ft009 with rescue rigging

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                  • REDLINE1
                    Senior Member
                    • Jul 2016
                    • 199

                    #10
                    Ran my Blackjack today. 1st run about 5 min 6s esc 115f. Motor 110f. Set it down and let it cool down while I ran my Spartan. 2nd run fresh packs did a complete run till I hit the lvc. 122f esc 120f motor max speed 59mph. I was running it pretty hard alternating between WFO runs downwind to medium speed back into the wind. It was about 65-70f out when I ran this morning

                    Comment

                    • TRUCKPULL
                      Fast Electric Addict!
                      • Apr 2007
                      • 2971

                      #11
                      Originally posted by REDLINE1
                      did a complete run till I hit the lvc.
                      Doing this is not the best thing for your batteries.
                      What voltage do you have your LVC set at?
                      What % is left in your packs at this point?
                      You should never run your packs below 20%, if you want them to last.

                      Larry
                      Last edited by TRUCKPULL; 05-29-2017, 11:02 PM.
                      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

                      • REDLINE1
                        Senior Member
                        • Jul 2016
                        • 199

                        #12
                        Originally posted by TRUCKPULL
                        Doing this is not the best thing for your batteries.
                        What voltage do you have your LVC set at?
                        What % is left in your packs at this point?
                        You should never run your packs below 20%, if you want them to last.

                        Larry
                        I usually don't run to the LVC which is set at 3.2v I run alarms on each battery set to 3.4v but the settings on them got screwed up and I ended up hitting the 3.2v setting on the esc. I wanted to do a full run to see what my temps were to see if my dual water cooling rudder was helping with the temps

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                        • random rc guy
                          Junior Member
                          • Oct 2021
                          • 2

                          #13
                          Hey Redline1, I know this is an old thread, but how did the mod work out for you long term?

                          Comment

                          • REDLINE1
                            Senior Member
                            • Jul 2016
                            • 199

                            #14
                            Originally posted by random rc guy
                            Hey Redline1, I know this is an old thread, but how did the mod work out for you long term?
                            still runs great one of my favorite boats

                            Comment

                            • random rc guy
                              Junior Member
                              • Oct 2021
                              • 2

                              #15
                              Originally posted by REDLINE1
                              still runs great one of my favorite boats
                              Thanks man for the reply, did you notice better water pickup with the dual intake rudder?

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