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Graupner ATR PT-109

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Graupner ATR PT-109

Home › Forums › Beginners › Graupner ATR PT-109

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  • 19 May 2016 at 15:22 #65511
    Dave Kershaw
    Participant
      @davekershaw17501

      Hi Please can you help,

      I'm trying to rescue the above boat which has the props missing,

      Im replace the shafts with M3 Threaded ( instead of original grub screw)

      But im not sure on best prop size and supplier

      I plan to use 600 size brushed motors, I have max clearance 38mm

      Plastic props I know would give good performance but I cant see to find any with M3

      Thanks

      Dave

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      19 May 2016 at 15:22 #2593
      Dave Kershaw
      Participant
        @davekershaw17501

        Propellor Advice

        19 May 2016 at 16:19 #65513
        ashley needham
        Participant
          @ashleyneedham69188

          Hi Dave and welcome to the forum.
          ​3mm shafting is not a common size and you will probably have to buy from a specialist supplier…PROPSHOP or someone.

          Loads of people must have a GP PT109 and no doubt will post to short order to advise on prop size but generally a motor this size would take a 35-40mm (ish) prop. However, this really does depend on the type of 600 and the voltage you are running at.

          Ashley

          19 May 2016 at 16:43 #65514
          Dodgy Geezer 1
          Participant
            @dodgygeezer1

            It is a pet hate of mine that M3 props are not available under this new-fangled metric system – they would be the nearest to the 1/8" shafts which were ideal for most model sizes….

            I make up M3 shafts, and then buy RadioActive M2 props – see here: **LINK**

            These have a central brass bush which can easily be prised out and then drilled/tapped to M3. And they are only a couple of quid each.

            Alternatively, make up a 3mm dog drive fitting and use one of the cheap chinese dog drive props…

            20 May 2016 at 09:12 #65532
            Dave Kershaw
            Participant
              @davekershaw17501

              Hi Guys,

              Thanks for welcome and quick reply,

              I'll be using 7.2 V and graupner speed 600 or equivalent, boat is 30" 1/30 scale I think.

              Im looking at Raboesch as well 146-10A, 146-11, but I have no experience with Brass 3 Blade props

              Dave

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