spiral transition curves

[mascur]

Does anyone have formulas for calculating spiral transition curves?

Mason

[watash]

I will have to unpack my surveyor's books, but will find that for you.

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Watash

[Alan]

http://www.trainboard.com/confused.gif I don't even understand the question http://www.trainboard.com/confused.gif

http://www.trainboard.com/biggrin.gif http://www.trainboard.com/biggrin.gif http://www.trainboard.com/biggrin.gif http://www.trainboard.com/biggrin.gif

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Alan

The perfect combination - BNSF and N Scale!

www.ac-models.com (http://www.ac-models.com)
Andersley Western Railroad (http://www.trainweb.org/andersleywestern/)
Alan's American Gallery (http://galleryusarail_tehcaj.homestead.com)

[watash]

Alan, a spiral curve going up hill or down hill, like a helix. In the real world these usually coiled around a mountain, so reached their tightest curve radii near the top. To conserve space, a helix is used on scale layouts which is more like the threads on a bolt, all the same radii all the way up, or down. There is a formula for right and or left, I have it, but have to wait to post it, because I had to scan it.

http://www.trainboard.com/userphotos/waynecrv1.jpg



[This message has been edited by watash (edited 06 November 2000).]