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Paul--are you sure about that? The diameter of a circle having a 22" radius is 44" X 3.1426 or about 138 1/4 inches. At a 1.5% grage that would transalate to about a 2" rise per revolution. I thought that for HO scale you neeed at least 3.5" per revolution, which at a 1% grade would mean that the distance travelled per revolution is around 233 inches. It may be possible to use a 22" radius curve if the helix were oval or oblong shaped and had a straight section totalling about 50 inches between each half circle. I am missing something or did I do my math wrong? <br /> <br />I seem to recall when I built my previous layout with a helix that I used 28" radius w/ a 2% grade. That gave me about a 3.5" rise per revolution.
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