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Overheating motor

Home › Forums › Scratch build › Overheating motor

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  • 11 April 2012 at 08:57 #33935
    Trevor Holloway
    Participant
      @trevorholloway99134

      Have just built a "Nexus Tide" Oil Rig Supply Vessel from MB free plans enlarged to 36" length and 8" beam giving approx 1:50 scale.

      On its maiden voyage at scale(ish) speed it looks fine with pleasing bow wave and wake, however it can go faster and stay stable.

      The problem is when I brought it in to check for leaks etc. the motor was smoking a little. Its using a 540 motor, 7.2v stick pack and a 45mm 3 blade prop.

      Any ideas on how best to tame the motor eg. water cooling / add gearing / add a fan / change the prop ?

      Any advice would be welcome.

      Thanks

      11 April 2012 at 08:57 #6795
      Trevor Holloway
      Participant
        @trevorholloway99134
        11 April 2012 at 09:14 #33937
        Colin Bishop
        Moderator
          @colinbishop34627

          My first thought would be that the prop is too big or has too much pitch and is overloading the motor. Try a smaller prop first, say 35mm.

          If the motor was smoking then it may have been damaged – do you know the motor specifications? 540 can be a lot of things depending on the number of windings.

          Colin

          11 April 2012 at 10:47 #33939
          ashley needham
          Participant
            @ashleyneedham69188

            Trevor, A 45mm prop is way too big for a 540 of almost any description . As suggested a 35mm would be ok Or gear it down a bit to use a bigger prop.

            My HMS Jersey OPV (which I dont think you have seen down at the pond yet) of about the same dimensions ran quite well on a cooking 540 on 6v and 35mm prop. Currently it has a 555 motor and 35mm prop on 12v which is about the same.

            Ashley

            11 April 2012 at 10:51 #33940
            Trevor Holloway
            Participant
              @trevorholloway99134

              Looks like I will have to get down the model shop for a few props before Sunday !

              Ashley – you missed the three new boats last Sunday even though I was there on my own !

              11 April 2012 at 14:03 #33944
              ashley needham
              Participant
                @ashleyneedham69188

                THREE! It was raining earlier, and we had to go to mums for lunch so couldnt get down a bit later on.. did consider the sub, in the rain !

                Ashley

                11 April 2012 at 14:05 #33945
                Trevor Holloway
                Participant
                  @trevorholloway99134

                  Nice and dry above the waterline when me and my daughter arrived !

                  16 April 2012 at 11:05 #33995
                  Trevor Holloway
                  Participant
                    @trevorholloway99134

                    Tried a 40mm prop (previous one has 55 marked on it – whoops) !

                    Ran a lot cooler – however inclement weather meant all the boats were going sideways yesterday and testing was cut short.

                    May try thr 35mm prop next time.

                    Thanks for the advice.

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