DoubleHelix™ (flex-track), 11.5"/3.81%, 14.0"/3.13% Turns (vertical rise):2 1/2 turns (6 7/8" rise)

DoubleHelix™ (flex-track), 11.5"/3.81%, 14.0"/3.13% Turns (vertical rise):2 1/2 turns (6 7/8" rise)The DoubleHelix for flex track "Oh that is so cool!!". Endlessly fascinating to model railroaders and to non model railroaders alike, the DoubleHelix is fun to build, enjoyable to operate and is perfect for smaller spaces than most layouts need. The DoubleHelix comes in two variations, 2 1 2 laps and 3 1 2 laps which is one whole loop taller. Two single track helixes connect at bottom and top to make a continuous run. Build your DoubleHelix as a stand

3 7/8 turns: 10 7/8"

[1] https://nationalt-traklayout

7 3/8 turns: 20 "

7 5/8 turns: 19 7/8"

4 1/2 turns: 11 3/4"

3 7/8 turns: 10 1/4"

5 3/4 turns: 16 3/4"

Available exit points in the top loop of this helix are at the following vertical rises: 7 1/8 turns: 18 3/4"

7 1/2 turns: 20 1/2"

1 1/2 turns: 3 7/8"

9 turns: 23 5/8"

Available exit points in the top loop of this helix are at the following vertical rises: 2 1/8 turns: 5 1/2"