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[quote user="rrinker"]  Oval helizes have been done, for sure. Usually to make the grade lower by making each layer have more track.  22" radius seems awfully tight, even for HOn3. A few simple rules of thumb: Hidden track, includeing a helix, should never be your tightest mainline radius, nor should it be your steepest grade.                            --Randy   <div style="clear:both;"> </div> [/quote] Tightest mainline radius is 18" in a couple of spots.  All equipment runs on 16.5" radius.  The calculations worked out to be a 1.5% grade.  Ive corrected the above, the radius was actually 18".   I didnt look at the plan before posting and went off of memory.  The radius probably could be adjusted to 20".  The bend at the middle of the "hour glass" is a 20" radius.
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