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Old 07-21-2012, 07:09 PM   #1
eljefe
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Grade slope

I'm looking for advice on a concept for a new layout I'm thinking about. It would be sort of a spiral along the sides of mountains surrounding a settlement on the valley floor within. I'm trying to determine how large it would need to be. My question is what is a good slope to use for O27 or O31 track so it's not too steep for typical locomotives to climb?
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Old 07-21-2012, 07:16 PM   #2
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Old 07-21-2012, 07:51 PM   #3
gunrunnerjohn
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I'd say the absolute maximum would be about 4 degrees, and with O31 track, you'll need a few straight sections in the mix to get that with 31" diameter curves. Obviously, you'll need even more for O27.

You need 144 inches of run to go up 6" for a 4% grade. When you're going on curves, that places an additional load, so the effective slope is even more, probably by several percent.

In my testing for my helix, I'm running into problems with the inner track slope with O31 curves and six straight sections for each 6" rise. Only shorter trains can make the trip, maybe 10-12 cars max. I'm currently rethinking what I want to do there.
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Old 07-21-2012, 08:20 PM   #4
seabilliau
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If you have never done an incline before I would highly recommend you throughly conduct test inclines before you do anything permanent, and then follow up with continuous testing while you are making it. I just recently tore up my entire PE layout primarily because of the incines and I was using only 3%.

My lesson learned for anything I do in the future will be to use the least amount of grade and the greatest length of distance. My future is flat flat flat until I absolutely have to go up.
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Old 07-21-2012, 08:32 PM   #5
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Originally Posted by seabilliau View Post
My lesson learned for anything I do in the future will be to use the least amount of grade and the greatest length of distance. My future is flat flat flat until I absolutely have to go up.
That's kind of a depressing assessment of one's future: "I have nowhere to go but flat!"
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Old 07-21-2012, 09:47 PM   #6
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It is a little depressing isnt it.
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