Re: Helix Question #2

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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.
Message 1 of 3 , Apr 2, 2012
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
>
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