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Compound spiral

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markfd
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Compound spiral

New to the software (BRT experience) and I am trying to design a railway alignment with tangent-spiral-curve-spiral-curve-spiral-tangent.

 

I can get answers but I am unsure whether they are the right answers!

 

When I check the parameters for the middle spiral it reports compound  = false.

Also when I look at the help screens it appears to me that the compound spiral set wants to go from a curve to infinity and back to the second curve and solutions that work don't look right, the compound spiral seems to join the first curve with a straight and then wind up to the second radius.

 

Any ideas?

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