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motor size

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  • #11340
    Jerry Young
    Participant
      @jerryyoung62912

      hi

      need help

      im am building a 1930’s us coast guard picket boat. model length is 39" beam is 61/2", plank on frame construction (plywood)

      i have done a bit of research on the net and found the full size boat to have a  max speed of 15 knots and a cruising speed of 10 knots.

      question-

      what motor size and propeller size would any modellers out there suggest to attain a scale speed?

      any help would be greatfull. i do’nt want to burn out motors or capsize her on a sharp turn. just want her to look right on the water.

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      #11341
      Paul T
      Participant
        @pault84577

        Hi Jerry

        A couple of questions about your boat.

        What type of hull does your boat have i.e. does it plane over the water like a speedboat or does it sit in the water like a barge?

        How heavy do you expect the model to be when finished?

        Do you want to use electric or I.C. power?

        All the best

        Paul

        #11342
        Jerry Young
        Participant
          @jerryyoung62912

          quite flat towards the stern and sharp towards the bows. i would say , considering it to be a life boat, it needs to be quick., so it would plane.

          finished weight is unknown at the moment. all ribs are 1/8 ply, hull and deck is 1/16 ply cabin is 1/8 ply.

          and yes i missed the all important bit. it will be electric, sorry.

          #11350
          Paul T
          Participant
            @pault84577

            Hi Jerry

            In the absence of any better advice I would suggest a 600 size motor driving a 3 bladed prop of about 20 > 25mm dia. Check on the amp draw of the motor before buying the batteries, bear in mind that these will also make great ballast so you might wish to choose a larger size of battery if you need the extra weight.

            Hope this helps.

            All the best

            Paul

            #11383
            Jerry Young
            Participant
              @jerryyoung62912

              hi paul

              sorry i didn’t get bak to you straight away, been called out on a breakdown at work

              thanks for the info i can start looking straight away.

              battery size will be dictated by space and weather it’s a series or parallell set up i think

              thanks for your help

              jerry  

              #1434
              Jerry Young
              Participant
                @jerryyoung62912
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