I have built a torsion wheel catapult (Mangonel) for an assignment,and I need to do some theoretical calculations about the displacement, velocity and time of the projectile, the problem is I don't know how to calculate the spring constant with out the displacement of the spring (x) and i dont Know how to measure x for a torsion wheel, I found one formula on wikipedia(adsbygoogle = window.adsbygoogle || []).push({}); T= -k theta^2,https://en.wikipedia.org/wiki/Torsion_spring#Torsion_coefficient. Would this formula work for a catapult.

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# How do i find the spring constant for a rope torsion spring

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