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Grade Values

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Reading Topic #11983

Charter Member · 125 posts

I am re-visiting my route after a long brake and I am trying to relate the values on my track charts to the metric grade values in MSTS. For example, the conrail track chart that I am using lists grades like .11, .13, .96. How do I convert these into the .150, .300, values in RE?

Brian LaVelle
Cincinnati Terminal Route
http://belcommunications.net/msts

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RE: Grade Values, lirc201, May-25-04, 09:17 PM, (1) RE: Grade Values, sniper297, May-26-04, 11:07 PM, (2) RE: Grade Values, OkrasaGhia, May-27-04, 11:59 AM, (3) RE: Grade Values, Baldwinbob, May-27-04, 12:21 PM, (4) RE: Grade Values, jdtrainman, May-28-04, 11:38 PM, (5) RE: Grade Values, lirc201, May-30-04, 12:54 PM, (6)

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Charter Member · 5819 posts

RE: Grade Values

LAST EDITED ON May-26-04 AT 11:09 PM (EDT)

Yes, but the MSTS numbers are not grade percentage, they're degrees above/below level (0.00 is straight, 90.00 would be straight up). To convert from degrees to grade percentage, multiply by 1.75, to convert from grade percentage to degrees, divide by 1.75.Default max elevation (without using Mike Vone's trick) in MSTS is 3 degrees, which is a 5.25% grade.

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Charter Member · 1459 posts

RE: Grade Values

Grade Values – image 1

That's not scientificly correct but a very good approximation for the grade values we are using in MSTS. For much larger grades you would get a recognizable error with this method (45 degrees aint 78.75%, it's 100%).
Mathematically correct would be:
degrees = arctan(percentage/100)
percentage = 100 * tan(degrees)


//Okrasa
Chief Engineer
okrasa @ xtracks.tk
http://www.geocities.com/okrasaghia
http://www.xtracks.tk

Grade Values – image 2

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Charter Member · 398 posts

RE: Grade Values

You can download this nifty utility from the library, tscalc or something like that.Grade Values – image 3Off we go,Bob

--------------------------
Sell crazy someplace else, we're all stocked up here

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Member since Apr-8-03 · 1144 posts

RE: Grade Values

There is also a document out there somewhere in the ether that is a conversion table for gradient and MSTS grade factor.JBD

Jim Duncan
Midwest Rail Group

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Charter Member · 125 posts

RE: Grade Values

I found a document on the steam4me website and downloaded MSTS Poker. I can directly input the grade values from the chart (into Poker) and get the MSTS equivlanent. It is working pretty well with one exception, trying to determine the starting altitude of the track! A little trial and error is involved there.Thanks for the replies,

Brian LaVelle
Cincinnati Terminal Route
http://belcommunications.net/msts

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