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Reply to "Helix help"

There is a minimum rise that must be considered.  One has to take in account the thickness of the supporting structure plus the roadbed (if any) plus the height of the track track plus the minimum clearance of the equipment.  this will be about 7 inches or 1/2" for supporting structure plus 1/2" for track plus 6" clearance.

If you want a 2% grade, you divide 7" by 0.02 or 350".  The diameter iis 350" divided by π (3.14) or 112".

The only way to reduce the diameter is to increase the grade. A 4% grade yields a diameter of roughly 56".

If you can insert a few straight section of track into your helix making it more like an oval you reduce the circumference by the total length of straight.

Jan

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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