Torsion Spring Catapult Velocity

AI Thread Summary
To design a torsion spring catapult capable of launching a 0.15kg ball at 35 m/sec, the arm length is set at 0.3m from the center of the torsion coil, with an assumed launch angle of 45 degrees. The discussion seeks assistance in defining the specifications for the required torsion spring. The context suggests potential applications such as a pitching machine. Key factors to consider include the spring constant and torque needed to achieve the desired velocity. Accurate calculations will ensure effective performance of the catapult design.
marietta_ken
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I'm trying to design a simple torsion spring catapult to launch a 0.15kg ball at a velocity of 35 m/sec at the moment of separation. The ball will be in direct contact with the unrestrained end of the spring. As a starting point, I'm planning a 0.3m length for that "arm" end of the spring as measured from the center of the torsion coil. I'm also starting with an assumption of 45 degrees of contact/throw for the arm.

Can anyone help me define the torsion spring I need?
 
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