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Helix Question #2

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  • proverbs30789
    What would be the tightest (inner or outer) diameter you could do on a Z scale single track helix using MTL Flex Track and run MTL passenger cars safely?
    Message 1 of 3 , Apr 1 9:19 PM
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      What would be the tightest (inner or outer) diameter you could do on a Z scale single track helix using MTL Flex Track and run MTL passenger cars safely? Thanks

      Eric
    • Ell
      I suggest you go to: www.ashlintrains.com and click on Helix Elevation Systems. They show 2 systems for z-scale, each set at 2% grade but for different radii.
      Message 2 of 3 , Apr 2 11:47 AM
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        I suggest you go to:

        www.ashlintrains.com

        and click on Helix Elevation Systems. They show 2 systems for z-scale, each set at 2% grade but for different radii. What you immediately see is there is a distinct difference in ramp clearance for the 2 helixes. The relationship between the height H needed from top of rail to top of rail in one circle, the grade slope S, and the radius R is H=2(Pi) x R x S . For a 2% grade, S= 0.02. One has to remember to include the thickness of what the helix is made from. For a 2 inch difference from top of track to top of track and 195 mm radius, you will have a grade of about 4%.

        Ell

        --- In z_scale@yahoogroups.com, "proverbs30789" <proverbs30789@...> wrote:
        >
        > What would be the tightest (inner or outer) diameter you could do on a Z scale single track helix using MTL Flex Track and run MTL passenger cars safely? Thanks
        >
        > Eric
        >
      • Jeff
        Probably the standard 195mm (just over 7 radius or ~15 diameter (center line) or about 18 overall, with clearances, structure framing, scenery, etc. Your
        Message 3 of 3 , Apr 3 9:46 PM
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          Probably the standard 195mm (just over 7" radius or ~15" diameter (center line) or about 18" overall, with clearances, structure framing, scenery, etc. Your are just asking to trouble trying pull tighter curves and 2+ % grades (mostly pulling power needed and traction slippage).


          Jeff M
          SF Bay Area Z

          -----Original Message-----
          From: "proverbs30789" <proverbs30789@...>
          Sender: z_scale@yahoogroups.com
          Date: Mon, 02 Apr 2012 04:19:23
          To: <z_scale@yahoogroups.com>
          Reply-To: z_scale@yahoogroups.com
          Subject: [Z_Scale] Helix Question #2

          What would be the tightest (inner or outer) diameter you could do on a Z scale single track helix using MTL Flex Track and run MTL passenger cars safely? Thanks

          Eric



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