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QUOTE: Originally posted by FJ and G Jon, A couple interesting sites: Helix using "Cadrail" (see the pdf download) http://bsulliva.oozy.ws/rr/georgetown_branch/layout/ Supposedly, this is a helix calculator, but the download didn't work in Mac http://www.fortunecity.com/westwood/beautiful/819/HeliCal.htm Here's a layout that purportedly IS a helix http://www.bcsj.org/rr/bcsj2/ I believe that Armstrong's book: "Track Planning for Realistic Operation" may have helix's mentioned I built, then dismantled a helix (don't have a picture). A helix IMO is a compromise between the diameter of the helix and the slope. The greater the diameter, the less of a slope is needed, but that wastes space and materials, unless you have a lot of space. Adding to the space waste is the notorious pilot swing of our locomotives. These swings can hit the supports if enough room is not built in. Most helixes use wood upright support construction. However, the wood itself is a space waster and makes clearances from side to side even tighter. I used all-thread, basically a very long screw, to minimize side-to-side cleances. There also are top to bottom clearances to consider when selecting materials for the roadbed. You might, for example, not want to add your cork roadbed because that eats into vertical space. Hope this helps a little. BTW, Elliot has in the past posted photos of his helix. Apparently, he has the space to go with wood upright supports
QUOTE: Originally posted by FJ and G Space is esp. at a premium for big O scale trains, and more than one level could effectively double your layout space. And, why stop at 2 levels; why not 3?
Jon
So many roads, so little time.
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