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How would I go about finding the spring constant of a bundle of nylon rope acting as a torsion spring?

I know the length. I dont know the width of the bundle. When twisted I wanted roughly 6cm diameter (is that a wrong method)?

I ll be twisting it by 1080 degrees.

When twisted as above ^ -

how can I calculate how much force/energy it will project if an arm in the middle of the torsion spring is pulled against it by a certain length/angle.

Im guessing that the longer the arm, the more it can pull back.

Like a ballista.

Thank you.

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# Finding the spring constant of a torsion spring.

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