DoubleHelix™ (set-track & flex-track), 12.4"/3.55%, 15.0"/2.93% Turns (vertical rise):2 1/2 turns (6 7/8" rise)

DoubleHelix™ (set-track & flex-track), 12.4"/3.55%, 15.0"/2.93% Turns (vertical rise):2 1/2 turns (6 7/8" rise)This DoubleHelix is specifically designed to match Kato Unitrack curves with radius 315mm and 381mm. The DoubleHelix for set track and 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

7 turns: 20 3/8"

8 7/8 turns: 23 1/4"

5 5/8 turns: 15 3/8"

This helix rises 2 15/16" per turn and has a maximum rise of 14 5/8"

8 5/8 turns: 23 1/2"

Custom cut spacer blocks based on specific grade of your helix

6 1/4 turns: 17 1/8"

3 3/4 turns: 10 5/8"

This helix rises 2 5/8" per turn and has a maximum rise of 13 1/4"

6 7/8 turns: 18 3/4"

4 turns: 11 5/8"

7 3/4 turns: 22 5/8"