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Simon and others, <br />Its kind of like playing pin the tail on the donkey blind folded without more information. The two critical measurements you need to tell us is the seperation from rail head to rail head you will have, then tell me what is the maximum radius you could physically have. <br /> <br />When most people start with helix's, it comes as a surprise as to how much room they take up. Most of my friends HO layout (I'm in N) use a 30 inch radius up, and a 28 inch radius down, or something close in that proximity. With a 30 inch radius, that means your helix will be over 5 feet across.
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