Designing a helix for a new layout. For the life of me I can not find a table that lists the effective slope induced by various radii. In other words, the smaller the radii of a helix, the more friction on the pulling force, thus a 2% slope at a 22" radius actually pulls like a 3.5% slope - or something. I remember using this table before. I believe it is from a J Armstrong book. Any help is welcomed Thanks