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RE: [O-14] BullAnt

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  • Frank Sharp
    Charles, I m thinking in terms of 60:1, Roy Links uses two 12:1 on the layshaft and another on the motor, total reduction 144:1. If say the gears in the
    Message 1 of 5 , Jun 1, 2005
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      Charles,

      I'm thinking in terms of 60:1, Roy Links uses two 12:1 on the layshaft
      and another on the motor, total reduction 144:1. If say the gears in the
      bullant train gave 4:1, you would have a total of 60:1. I don't think
      the 5.5 associations sets are quite that low, but I have seen them run
      and they are very controllable.

      Frank
    • Roy Link
      Not quite correct - my LISTER uses three 14:1 worm sets, one set drives the layshaft, on which two sets drive the wheels. Total is 196 to 1. At full 12 volts
      Message 2 of 5 , Jun 1, 2005
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        Not quite correct - my LISTER uses three 14:1 worm sets, one set drives
        the layshaft, on which two sets drive the wheels. Total is 196 to 1. At
        full 12 volts the LISTER has a similar (scale) top speed to the real
        thing.

        The LBT by contrast, has a longitudinal mounted motor, driving the
        layshaft through 4:1 brass spur gears. The worm sets are 14:1 so the
        total reduction is 56:1. Neither is ideal but a huge improvement on a
        SPUD or BullAnt. Experience tells me that, for 7mm scale models of
        small IC locos, the 'ideal' reduction is around 80:1.

        The SPUD (Self Propelled Underfloor Drive) was developed in Japan, by
        Tenshodo, to power HO scale models of fast interurban electric units,
        allowing full interior detail to be fitted. It is entirely unsuitable
        for application to 7mm NG - whatever anybody thinks or says! As the
        BullAnt is more or less identical, apart from the way the motor is
        mounted, it also has little to offer in terms of slow speed performance.

        My own LBT has a 16/16 coreless motor with 84:1 reduction and runs as
        slowly and smoothly as one could wish. At 'walking pace' it requires
        around 8 volts so has fewer collection problems. This is one area
        though, where DCC has its attractions. The constant track voltage
        promotes better current collection for undergeared units (like the
        SPUD) which only run slowly on very low voltages. Even so, the small
        motors used, really like higher revs, and will run in faltering manner
        at very slow speeds. While the addition of very heavy whitemetal bodies
        smooths this out to some extent, I doubt the units will last over long.

        Most modellers greatly over estimate speed. Coupled with the shorter
        distances encompassed by most of our layouts (selective compression
        etc.) we actually do need locos that run as slowly or slower than the
        real thing in order to give a realistic effect.

        Roy C Link
      • Charles Hansen
        I suppose someone could try contacting them with suggestions for improvement as it s still in development. Charles ... and another on the motor, total
        Message 3 of 5 , Jun 2, 2005
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          I suppose someone could try contacting them with suggestions for improvement
          as it's still in development.

          Charles

          >I'm thinking in terms of 60:1, Roy Links uses two 12:1 on the layshaft
          and another on the motor, total reduction 144:1. If say the gears in the
          bullant train gave 4:1, you would have a total of 60:1. I don't think
          the 5.5 associations sets are quite that low, but I have seen them run
          and they are very controllable.
        • Geoff Baxter
          Hello, You might say: Your wish is my command . My name is Geoff Baxter. I am the proprietor of Hollywood Foundry, the maker of the BullAnt. I have been
          Message 4 of 5 , Jun 9, 2005
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            Hello,

            You might say: 'Your wish is my command'.

            My name is Geoff Baxter. I am the proprietor of Hollywood Foundry,
            the maker of the BullAnt. I have been following this discussion with
            interest. The BullAnt is intended to be a universal motor bogie
            solution, able to be specified and configured to meet most
            requirements in gauges from 16.5mm down to 9mm. As such, it will
            never be the ideal solution to everyone's requirements, but I am
            quite keen to listen to informed comment and criticism from people in
            the hobby, on one proviso: I need to keep the design as generic as
            possible and really specialised changes may not be implemented.

            Since the original release of the BullAnt, I have made a number of
            changes, one of which is to soon offer a choice of gear ratios. The
            standard will be 16:1 for DMU/EMU applications, primarily in Europe,
            followed by 31:1 and 60:1 using a double reduction gear box.

            Regards,
            Geoff


            --- In O-14@yahoogroups.com, "Charles Hansen" <velotrain@p...> wrote:
            > I suppose someone could try contacting them with suggestions for
            improvement
            > as it's still in development.
            >
            > Charles
            >
            > >I'm thinking in terms of 60:1, Roy Links uses two 12:1 on the
            layshaft
            > and another on the motor, total reduction 144:1. If say the gears
            in the
            > bullant train gave 4:1, you would have a total of 60:1. I don't
            think
            > the 5.5 associations sets are quite that low, but I have seen them
            run
            > and they are very controllable.
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