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| conversion formulas for grades and curves https://www.rypn.org/forums/viewtopic.php?f=1&t=11458 |
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| Author: | scrmcurator [ Sat Nov 20, 2004 8:41 pm ] |
| Post subject: | conversion formulas for grades and curves |
I'm looking for two formulas. I was an art major, not math, so figuring the forumlas out on my own isn't a very good option. I want to convert UK gradients (1 in 20, etc.) into percentages. I also want to convert dgree of curvature into radius. Can anybody supply the appropriate formulas? |
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| Author: | Erik Ledbetter [ Sat Nov 20, 2004 9:30 pm ] |
| Post subject: | Re: conversion formulas for grades and curves |
The first is easy: divide out your fraction then multiply x 100 So, for 1 in 20, 1 divided by 20 is .05, x100 = 5% For the second: R = 50/sin(A/2) where R is Radius in feet and A is degree of curvature. See http://www.steamlocomotive.com/model/curve.shtml for a discussion and a table of radii for common prototype curves in degrees. |
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| Author: | Ed Fritz [ Sun Nov 21, 2004 7:54 am ] |
| Post subject: | Re: conversion formulas for grades and curves |
If you contact me back channel, I'll send you a spread sheet with the formulas inbedded in them. Ed |
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