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Hello Jim and Mike, You're both correct and I'm wrong! I got fixated on the 22" radius and entirely negelected to consider the rise per revolution in HO scale with a 1.5 percent grade. Sheesh, ever after coming back to HO scale after all those years in N scale I still should know better. So, our questioner will have to employ the steeper gradient, 2.8 percent, as Mike correctly points out. And that in turn raises the issue of degree of curvature. Broader is better in that case. I owe you both one. To the question poster: I'd look elsewhere to put that helix. The location is tempting but you'll likely find having the helix there is source of frustration. The space is too small to allow for a more generous radius (which would enable a grade that's less steep). Paul
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