Recommended ruling grade?

Recommended ruling grade?

Postby AstroGoat760 » Tue Jan 07, 2014 8:20 pm

Much like ConducTTor, we are in the planning stages of building a permanent TT layout for our house, and one possibility that came to mind is to have a bi-level layout, which would help maximize scenic runs and keep within a set amount of space. Possibly above the second level would be display shelving.

The current thinking is to have a helix on one side of the layout, and a "mountain pass" on the other, which would allow for modeling the Appalachians on one side, and the Rockies on the other (the one with the Helix). We are planning on having one or two loops that stay level as well, for equipment unable to "make the grade", such as the 4 wheeled switchers and such.

Is there any consensus as to what an acceptable grade is in TT scale?
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Re: Recommended ruling grade?

Postby ctxmf74 » Tue Jan 07, 2014 9:06 pm

"Is there any consensus as to what an acceptable grade is in TT scale?"

Generally 2% -3 % works well for most scales. Shorter trains could handle more though. I'd make a test track by setting a board with track on it at different grades and see how your own TT stuff handles it. Keep in mind the curved helix will put more strain on the trains so if they climb a straight grade at 5%they might only climb a curved grade at 4% so back off from the steepest possible grade to allow some cushion .....DaveB
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Re: Recommended ruling grade?

Postby ConducTTor » Tue Jan 07, 2014 9:28 pm

Ditto what Dave said. 2% = desired, 3% = max.
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Re: Recommended ruling grade?

Postby AstroGoat760 » Tue Jan 07, 2014 9:54 pm

I figured that is around what it would be, although I used the wrong term for what I was thinking of. I said that I wanted a helix, but what actually meant was a spiral, which is sort of like a helix, but with better access to the trains, and more scenery. Case in point: Tehachapi Loop.
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Re: Recommended ruling grade?

Postby ctxmf74 » Wed Jan 08, 2014 12:49 am

Tehachapi Loop.
I've sat on the hill in the center and had stereo sound from 12 SD45's and Tunnel Motors wrapped around me. The oil can Tank Train would go around there making about 12 MPH on full throttles. IIRC the grade is about 2% and it gains something like 90 feet of elevation where it crosses so like one lap of a very large helix :>) ..DaveB
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Re: Recommended ruling grade?

Postby ConducTTor » Wed Jan 08, 2014 1:07 am

TWELVE locos??!?!?!! Damn


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Re: Recommended ruling grade?

Postby AstroGoat760 » Sun Jan 12, 2014 12:54 pm

Thanks, I figured that the gradients for HO and N would work for TT. I do not recall seeing much for TT layouts with grades, and I figured it would be worth asking, as there is a lot going on in my mind regarding how to build the layout, and I want to make sure all bases are covered.
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Re: Recommended ruling grade?

Postby MacG » Sun Jan 12, 2014 5:28 pm

At a double track helix it is better, that the direction at the inner circle is downwards. Because of the higher grade as the parallel outer circle.
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