New Toy For The Swimming Pool

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  • rwtdiver
    Vice Admiral

    • Feb 2019
    • 1891

    #61
    Today I am making more head way on the two WTC (boxes) electrical.

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    I have installed the water tight connectors for the power suppy from the battery box to the electronics box.

    Rob
    "Firemen can stand the heat."

    Comment

    • rwtdiver
      Vice Admiral

      • Feb 2019
      • 1891

      #62
      Seems like when the building process starts to move in the right direction it is hard to stop working on it.

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      I now have all the external wiring penetrations needed for the WTC (watertight boxes) what's remaining is the two 3s 11.1 volt 2200 mah (wired in parallel) in #1 box and the #2 box will contain the two ESC's, one receiver and the corresponding wiring required. The receiver antenna will exit the #2 box and run through the 2 main body interiors.

      As an explanation as to what the wires are. The two large black cables contain the wiring for each of the two thrusters. Each cable contains 3 16 AWG wires that will connect to the 3 16 AWG wires from the thrusters. the red and black silicone wires are the 14 AWG wires that are coming from the battery case to the electronics case. I allowed extra length on those two wires which will allow to remove the battery case and remove the Lipo batteries for charging.

      Rob
      "Firemen can stand the heat."



      Comment

      • rwtdiver
        Vice Admiral

        • Feb 2019
        • 1891

        #63
        This morning in 38 deg water I did a leak test on my 2 watertight boxes.

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        Held them under in about 18" of water for 3 to 4 min using my leaf collector handle. Here to say not a drop of water inside the boxes.
        I am now ready to complete the interior wiring process.

        Rob
        "Firemen can stand the heat."

        Comment

        • rwtdiver
          Vice Admiral

          • Feb 2019
          • 1891

          #64
          At this point of the main hull build I glued up the 2nd main hull member to the main tail section.

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          I also did some sanding and some fill in work. The main hull sections are completed, the head mounting system is complete. Ounce I get the wiring completed in the two boxes I will be able to install and connect up the thrusters.

          Rob
          "Firemen can stand the heat.".

          Comment

          • rwtdiver
            Vice Admiral

            • Feb 2019
            • 1891

            #65
            Finished up the electronics wiring inside the WTC (watertight box)

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            I also installed my FM receiver in the watertight box and I will be running the antenna inside the two main hull sections making a loop. I got this VEX transmitter and receiver from Nautilus Drydocks that I did not use on a 212 build. I am going to set up the throttle stick and the dive plane stick and make it a manual two stick operation. I have already bench tested it and it is going to work ok.

            Rob
            "Firemen can stand the heat."

            Comment

            • rwtdiver
              Vice Admiral

              • Feb 2019
              • 1891

              #66
              Originally posted by redboat219

              Here is the arm and hand mechanics I used on my InMoov Robot.



              Quite complicated and tedious work to say the least, I loved every min. of this Robot build...

              This YouTube is in reference to Romels YouTube on page one of this build blog showing the mechanical arm. A little off course from my shark build..

              Rob
              "Firemen can stand the heat."
              Last edited by rwtdiver; 01-25-2025, 04:18 PM.

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              • rwtdiver
                Vice Admiral

                • Feb 2019
                • 1891

                #67
                I am starting to work on the two lateral fins.

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                I have installed weights inside the two fins for ballast weight and then filled with some epoxy resin to hold them in place. I had thought about adding the weight to the bottom hatch, then beings the fines where basically hollow why not put the weigh down even lower and very close to the CG on this shark. We will certainly find out when we start water testing this beast..

                Rob
                "Firemen can stand the heat."

                Comment

                • rwtdiver
                  Vice Admiral

                  • Feb 2019
                  • 1891

                  #68
                  Today was spent finishing up all the wiring on my shark!

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                  To finish it up the only thing that was left where the thrusters. I wired in waterproof disconnects to each thruster to make replacement or repairs much easier.
                  All control wiring, receiver and transmitter are set up. I did do a bench run to make sure all the wiring was correct and both thrusters worked in the correct direction.

                  I will be doing a complete water check (in the pool) on everything to be sure there are no leaks in either of the boxes, and then I will do a run up in the pool to check out the thruster operation. If everything checks out, I will go back into completing the sharks body build, adding weight and foam as required. And then more pool testing before the final finish work.

                  Rob
                  "Firemen can stand the heat."

                  Comment

                  • rwtdiver
                    Vice Admiral

                    • Feb 2019
                    • 1891

                    #69
                    OK!

                    I am sorry this video is a little wild. I did not realize that the shark was about to pull out of my hands. But as you can see the thrusters are working great and with some real force.



                    I also realize this run was just the thruster housing ONLY, I hope when the head and the rest of the tail section are installed that I can get enough water into the thrusters to get some good forward operation. Based on my trail run its going to work out.

                    Rob
                    "Firemen can stand the heat."

                    Comment

                    • rwtdiver
                      Vice Admiral

                      • Feb 2019
                      • 1891

                      #70
                      Today I cut, fit, and glued in the floatation foam for the shark.

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                      I also fabricated the sharks stand. The brackets where 3D printed and will be mounted to painted piece of wood. This will certainly make the shark a lot easier to work on and to lend itself to a model stand as well when the shark is not in use.

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                      Tomorrow I will be mounting the lateral fins and the dorsal fin to the main body. After that is completed, I will mount the tail section, install the electronic boxes, charge the batteries, and them it will head to the pool for testing. I am hoping that I will not have to deal with to much weight or foam addition. (Yes, that will be the day)

                      Rob
                      "Firemen can stand the heat."



                      ​​​​​​

                      Comment

                      • rwtdiver
                        Vice Admiral

                        • Feb 2019
                        • 1891

                        #71
                        Finished putting the shark together to make ready for sea trails.

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                        Tomorrow, I will be putting it into the pool to find out how far off if any the trim might be. As stated, before in the build blog the added weight for ballast is built into the two lateral fins. I currently have the lighter of the two fins mounted. I built a set of two additional fins that are somewhat heavier if I need it. And possible additional weight required will be built into the hatch cover. I also have addition space at the top of the shark for foam if needed.

                        Rob
                        "Firemen Can stand the heat.

                        Comment

                        • rwtdiver
                          Vice Admiral

                          • Feb 2019
                          • 1891

                          #72

                          Starting the prep work to get the shark ready for its maiden voyage. The way I have it set up currently, the Vex transmitter will be turned on and then I will plug the two 11.1 volt 2200 lipo batteries into the parallel connector, place the battery box inside the shark and close up the bottom hatchand head for the pool.

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                          I realize the way I have it set up right now is a real pain in the butt. And I would agree. If the testing goes well today I will be installing a remote switch system for future pool operations

                          My wife is going to do a series of videos as to how it all works out. It will either be a real Laurel and Hardy show or (I am hoping) a really nice operational pool shark!? At this point we are waiting for the outside temp. to get up to 65 deg. I will need to step into the pool to launch the shark, no way I can just kneel down and slip it over the side. The old bones just won't allow that. Ha Ha.

                          Rob
                          "Firemen can stand the heat."



                          Comment

                          • DrSchmidt
                            Rear Admiral

                            • Apr 2014
                            • 1177

                            #73
                            That shark looks good....curious to see how it performs. But definitely suitable to scare some folks in the pond....

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                            • rwtdiver
                              Vice Admiral

                              • Feb 2019
                              • 1891

                              #74
                              Originally posted by DrSchmidt
                              That shark looks good....curious to see how it performs. But definitely suitable to scare some folks in the pond....
                              Thank you, Andreas

                              But the testing did not go as per plan... The trim was way off so I need to adjust by taking some of the foam out of the head or may be add some weight.







                              I also had an issue with the motor operation which I attribute to a slight leak in the electronic box. I really do not enjoy showing my failures that much, but to me I think you need to show the problems that can arise from these projects, and to me that is certainly part of the learning process. This shark will be a performer when I get the issues ironed out...

                              Rob
                              "Firemen can stand the heat."
                              Last edited by rwtdiver; 01-31-2025, 03:23 AM.

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                              • rwtdiver
                                Vice Admiral

                                • Feb 2019
                                • 1891

                                #75
                                One of the issues that I found with my electronic box was I had a leak. I got somewhat fancy with the wiring exists and my idea seemed to fail. So, I have ordered up another box and will use better components than the handmade leakers that I built.

                                I do have a question:



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                                The above photos show the shrink tubing on my soldered wire connections. Is heat shrink waterproof if done properly?

                                The bottom photo shows the waterproof wire connectors that where soldered to the thruster motors and these connections are exposed to water.

                                Rob
                                "Firemen can stand the heat."





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