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Russian Alfa Class

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  • I'm sure David will chime in, but typically one would drill and tap the endcap and thread the stud into it. Wick some thin CA at the base and it will shoot down into the endcap and create your seal. You can also put a drop of thicker CA on the threads before you get to the desired depth, and then screw it into the endcap until the CA drop is well into the endcap material.

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    • Thanks Bob!

      Great idea, but as usual I did not have a tap that small. So, I drilled the hole for the brass screw slightly smaller and used the screw itself to make the threads. They screwed in great and formed a nice tight fit, I then backed them out and applied the medium CA to about center and screwed them back in followed by thin CA. It seems to be a good solid fit!

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      I am manufacturing my own copper studs, and again it's because I did not have the right size for the job. I still have some shaping work to do on them before I solder on the wires from the motor on the wet side and the ESC on the dry side. Time consuming for sure, but it is fun to learn new ways of doing things!

      Thanks again for your help Bob!

      Rob
      "Firemen can stand the heat"



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      • OK! I changed my mind, and I am now going with a better design for the motor link ups!

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        I am using the motor wires and made loop and soldered them to form the connections. The copper studs were just to big and bulky!

        Rob
        "Firemen can stand the heat"
        Attached Files

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        • OK! The motor end wiring is done!

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          I do have a question about the ESC wiring to the motor!?

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          There are three wires coming from the ESC. They are marked A,B, and C and all black! The motor has three wires and they are Red, Black, and Yellow as per photo. Can I use the line up (hook up) as per the photo?

          Rob
          "Firemen can stand the heat"

          Comment


          • Hi Rob,

            Yes, you can wire the motor to the ESC as per your picture. If you notice the motor rotating in the wrong direction when going forward, simply swap any of the two wires and reconnect them to the ESC. I usually keep the center motor wire connected to the B wire on the ESC and swap around the other two.

            Nate

            Comment


            • Originally posted by neitosub View Post
              Hi Rob,

              Yes, you can wire the motor to the ESC as per your picture. If you notice the motor rotating in the wrong direction when going forward, simply swap any of the two wires and reconnect them to the ESC. I usually keep the center motor wire connected to the B wire on the ESC and swap around the other two.

              Nate
              Thank you very much Nate,

              I really appreciate all your advice and help on my Alfa sub project.

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              Prior to building submarines my passion was scratch building and flying quad, and tri-copters. Running brushless motors and the ESC's on submarines seems to be the same, except for the environment.that we operate them in. So for me a little refresher course and help does give me a little re-assurance that I have not forgotten everything.

              Thank you Nate, and others, for stepping up with advice and help!

              Rob
              ​​​​​​​"Firemen can stand the heat"

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              • That’s a really cool looking tricopter Rob! Can’t wait to see the Alfa in the water.

                Nate

                Comment


                • Originally posted by neitosub View Post
                  That’s a really cool looking tricopter Rob! Can’t wait to see the Alfa in the water.

                  Nate
                  Thank! I really enjoyed that hobby as well!
                  Now that the wiring on the motor and the ESC is all squared away (Thanks for the help) the rest will be a lot simpler and it should start moving along at a better pace! :-))

                  Rob
                  "Firemen can stand the heat

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                  • I am getting ready to reinforce the hull sections on my Alfa!

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                    I am going to use resin and fiber glass cloth.

                    QUESTION: Would # 6oz cloth be to heavy to lay up around the bulk head supports?

                    Rob
                    "Firemen can stand the heat"

                    Comment


                    • 6 oz. will work but it is harder to get it to lay down over sharp edges. If you lay it down with the weave at 45 degrees to an edge it will conform better. Just a little trick I learned from my friend Darrell who does a lot of mold making.

                      Comment


                      • Originally posted by RCJetDude View Post
                        6 oz. will work but it is harder to get it to lay down over sharp edges. If you lay it down with the weave at 45 degrees to an edge it will conform better. Just a little trick I learned from my friend Darrell who does a lot of mold making.
                        Thanks Steve!

                        That is a different approach to using fiberglass! I will give it ago!

                        Rob
                        "Firemen can stand the heat"

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                        • Finally! My WTC for my Alfa Boat is complete!

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                          All the wiring is complete and checked out, but the big major change that I made to the WTC was to install a brushless motor system, which I am pleased to say works great!

                          As some of you are aware this WTC started out as an 80mm WTC with dual brushed motors that I purchased from Nautilus Drydocks for my Arkmodel Type VII submarine. Well in classic fashion I managed to screw up the (burned up) the original WTC. So I decided to refurbish the WTC and rebuild it using a single 750KW brushless motor and revamp the WTC except for the ballast pump and ballast tank and use this rebuilt WTC on my 1:72 3D printed Russian Alfa boat

                          Well I am here to say the rebuild turned out great and will make a great power unit for the Alfa.

                          Rob
                          "Firemen can stand the heat"

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                          • Tomorrow I will be starting my trim work on the Alfa boat!

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                            The WTC is complete, all linkages, drive systems have been installed, and the battery is in place! I have added some weight to the center of the bottom hull right at the keel, and at this point the CG is right at the center point of the boat. At this point I will take it to the pool and see where we are at with the trimming. I think I will need more weigh and of course foam will be added to the upper hull to further stabilize the boat in the water.

                            Rob
                            "Firemen can stand the heat"

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                            • Weights have been adjusted and foam added to the Alfa!

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                              The trim work is completed and I did run the boat from end to end of pool. I filled the ballast tank and did put the water level at just 2" below top of sail! I am very pleased with how it moved and responded in the water.

                              The brushless motor performed great, as well as the total modification work that I did on the 80mm WTC that I got from Nautilus Drydocks. All that remains is some finish work on the boat and a possible video in all it's colors!

                              Rob
                              "Firemen can stand the heat"
                              Last edited by rwtdiver; 06-01-2022, 11:57 PM.

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                              • Great work, Rob!

                                2" might be a tad on the high side. I'd shoot for something more like 1/2". You just need a whiff of positive buoyancy. Too much, and the boat will be fighting to stay under and be tricky to control when submerged.

                                Bob

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