Bismarck and a DD

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Bismarck and a DD

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  • #62773
    Dave Milbourn
    Participant
      @davemilbourn48782

      "the power unit 12v Nimh work only for motors and I will use an other unit ( 7,2v as I have) for my receiver"

      No! I wrote at the top of my drawing "Exactly like this" and that is exactly what I meant.

      You need only the 12v battery. You don't need another one for the receiver. I'm sorry because I believe that English is not your first language, but where I have written NO CONNECTION then there is NO CONNECTION. NOT 7.2v. NOT 5v. No Connection. Nothing in that socket. Rien. Niente. Nenhuma coisa. How can I make it any clearer?

      At the risk of boring both myself and anyone else reading this to a complete standstill, the power for the receiver comes from the 12v battery via the speed controller, where it is reduced to 5v and sent down the three thin wires to Socket #2. If you connect any other battery into the Battery socket on the receiver then you will blow it up. Dead. Morto. Muerto. Mort.

      Giving advice is what we're here for, but when we take the trouble to offer you some then would you please read it carefully before replying? I think we'll leave your Fletcher Class for another time; my blood pressure may not be up to it just now.

      Dave M

      Edited By Dave Milbourn on 15/01/2016 17:24:43

      Edited By Dave Milbourn on 15/01/2016 17:25:15

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      #62774
      Max Cormick
      Participant
        @maxcormick

        @Dave,

        excuse me , I beg your pardon : I didnt understand well first my english is not my language second I do not know how a ESC works

        Now all is clear and I say again excuse me

        Maurizio

        #62775
        ashley needham
        Participant
          @ashleyneedham69188

          The DD Fletcher seems to be 36 inches long by 4 inches wide. Weight may be an issue here as it is very thin and the weight needs to be kept low. I would have thought two 385 would be ok? the 360 is almost the same size as a 385. I personally would fit a pair of 380 motors and use a 7.2V battery, but if 280 motors are available they may do on 20-25mm props, and 7.2V.

          You tube video of a similar conversion shows the boat to be fairly tender (rolls easily) and the weight will have to be kept low on this one. I would also suggest oversized bilge keels to help control the rolling, depending on how accurate you want to be, or if you would sooner have a better quality sailing experience.

          Use same diagram as previous, just with two motors. I would check the ballast requirement using the time honoured home test tank (in the bath) before deciding to use a 12VNimh battery.

          ONLY ONE BATTERY IS NEEDED IN THE BOAT FOR THE ESC IF USING AN ESC WITH A BEC FACILITY; THE BEC FUNCTION POWERS THE RECIEVER. NO MORE BATTERIES ARE NEEDED. see diagram

          Ashley

          #62781
          Dave Milbourn
          Participant
            @davemilbourn48782

            excuse me , I beg your pardon : I didnt understand well first my english is not my language second I do not know how a ESC works. Now all is clear and I say again excuse me

            Maurizio
            That's OK now, and please forgive my exasperation at failing to get the right information across to you. My diagrams are like pictures – if you make the wiring look exactly the same then everything will work. You don't need to add or remove anything. By the way what is your first language? Is it Italian?

            Dave M

            #62783
            Max Cormick
            Participant
              @maxcormick

              @Dave,

              Yes I'm Italian, I well Understood all your Diagrams, I read carefully all you posted about BEC circuit

              All is clear now and I again apologie for what happened.

              By the way I bought 3 MFA RE-385LN as indicated……waiting for them…..

              I found , at good price, 1 power pack 6v 4500MA

              is it possible to buy 2 packs and to join them in series so I will have 12v and 4500MA?

              trouble on looking for ESC with BEC they do not have in Italy

              I found this one in Uk:

              Mtroniks Viper Marine 20 Plug n Play Electronic Speed Controller

              The Viper Marine20 PnP is a Brushed Speed Control designed specifically for use in RC model boats. The Marine20 has a 20Amp motor limit and has proportional forwards and reverse functions

              6-12 Volts input voltage
              100% waterproof design
              BEC
              Dimensions : L39.0mm x W34.0mm x H13.0mm, Weight : 55g

              I think it could be ok

              all my best

              Maurizio

              #62784
              shipwright
              Participant
                @shipwright

                I think that Dave's excellent introduction to electrical aspects of model boating is relevant to this thread :

                Go to the banner that says "Home", Features", "Albums", "Forum" etc etc

                Click on "Features"

                You will now see 4 photos below on of which is of an electric motor with title "Hints, Tips & Technical" – click on the photo and then look at the list of topics available – for electrical topics click on "But I Don't Understand Electronics"

                Note that the figures referred to in the text are all on the right hand side top of the text – click on a picture and you can see an enlarged version. Photos referred to in the text are on the left of the text.

                Ian

                #62785
                Malcolm Frary
                Participant
                  @malcolmfrary95515

                  Connecting two 6 volt batteries of the same capacity in series will give the 12 volts that you want. It is important to make sure that both batteries are kept in the same state of charge, the best way is to charge them in series as if they were one 12 volt battery.

                  Your chosen ESC should be just fine.

                  Edited By Malcolm Frary on 16/01/2016 09:30:18

                  #62786
                  Dave Milbourn
                  Participant
                    @davemilbourn48782

                    Maurizio

                    That speed controller would be suitable, although not having used that particular type I can't personally recommend it – but it is a popular choice in the UK.

                    You can make up a wiring harness to connect two 6v NiMH packs in series to give 12v. Here's a diagram. The harness may be available commercially but I have no information about that.

                    series wiring 2 x 6v.jpg

                     

                    Thanks for the sales pitch, Ian!

                    Edited By Dave Milbourn on 16/01/2016 09:46:26

                    Edited By Dave Milbourn on 16/01/2016 09:46:52

                    #64759
                    Max Cormick
                    Participant
                      @maxcormick

                      Hi Guys,

                      I would like to say thanks to all helped me on understanding how to use ESC and not only it…..

                      I started with my uss Fletcher and all works well

                       photo P1020755.jpg

                       

                      work is on progress

                      regards

                      Cobby

                       

                       

                       

                      Edited By Max Cormick on 19/04/2016 16:57:40

                      Edited By Max Cormick on 19/04/2016 16:58:35

                      Edited By Max Cormick on 19/04/2016 16:59:24

                      Edited By Max Cormick on 19/04/2016 17:04:17

                      Edited By Max Cormick on 19/04/2016 17:07:20

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