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[From what you are saying it sounds as if 18 inch radius is pushing it a bit. I am just about to start construction of a helix. What is the optimum radius for 20-30 car consists? Thanks]Originally posted by Simon Black [quote]QUOTE: Originally posted by rsn48 With that space, you will find it tight for a helix. It means your maximum radius will be 18 inches (36 diameter): At 3 inches of seperation 2.5 % grade at 3 1/2 inches of sep 2.9 % at 4 inches of sep 3.4 % [/quote] [/quote]
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