ldsig : Message: Re: [ldsig] Transitional Vertical Curve

You didn't mention a scale, but in HO (and any smaller scale) the EASY solution for vertical curves is to use 3/4" plywood for the subgrade. Let the subgade make its own transition from level track to the desired grade, as it can't make a vertical curve so severe that it will cause trouble. No calculations are needed � a good thing since I was an English major!

So long,

Andy

Tue Feb 14, 2012 3:04 pm

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Andrew Sperandeo <asperandeo@...>

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Hi All Planning a rise on a curve . So far the curve is a 36 inch radius at 1.5 percent rise and will be superelevated and continuing to a straight 2.0 percent...	Michael Hansen michaelh1954...	Feb 14, 2012 11:33 am
Hello Michael, You didn't mention a scale, but in HO (and any smaller scale) the EASY solution for vertical curves is to use 3/4" plywood for the subgrade. Let...	Andrew Sperandeo asperandeo	Feb 14, 2012 3:04 pm
Thanks Andy , Sorry a late reply But are you sure you get away with this thickness of ply and if yes Ive got to say No for me. I have done more than a few...	Michael Hansen michaelh1954...	Feb 19, 2012 10:46 pm
Hello Micheal, Am I sure I'm using 3/4-inch plywood? No doubt about it. (Just to clarify one point, I cut my "ribbon roadbed" out of flat sheets of 3/4-inch...	Andy Sperandeo asperandeo	Feb 20, 2012 3:27 pm
I have to agree with the Aussie. 3/4" plywood for vertical curves or subroadbed is a bit of overkill. Plywood does have considerable bending strength...	walshrd@... walshrd	Feb 21, 2012 1:42 am
Hi Gentlemen . I Thank You both and will not question Your experience as I do trust what You have done . I have visited 2 local timber suppliers yesterday and...	Michael Hansen michaelh1954...	Feb 21, 2012 6:28 am

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