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HO Helix
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FWIW I built my helix out of clear 1x6" white pine and cut an angle at each end of each piece to get the curve. It takes 12 pieces to make a circle, but they cut real fast and the waist is minimal. The length of the piece determined by the radious of the circle. And the pieces were joined with "biscuits" and glue. The vertical spacing is controled by threaded rods with nuts going thru metal plates that are connected to the bottom of every other joint. Worked pretty good, has been in use for over ten years. Make the start of the grade small (1/2 %) so the cars do not pitch up or down, very important if you run long equipment it could bottom out on the rails. <br /> <br />Gramps Railroad
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