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First of all the diameter of a circle is two radius. So if you have a three foot radius, your diameter is 6 feet. Basically the formula in plain language is saying your helix needs to be a bit wider than your widest track. <br /> <br />So, if you have a 30 inch radius track, that is 60 inches in diameter (5 feet) so you need it to be a bit wider, I personally would add around 3 inches to the radius, to take in width for construction, etc. So your diameter would be 5 1/2 feet (or 33 inch radius). <br /> <br />If you build a helix, try to double track it as you can always use the second track for staging or what have you. Trains spend so much time in a helix, most double track anyway so that a train going up doesn't have to wait for a train coming down.
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