Which mechanical effect limited the range of torsion-powered siege engines in Roman warfare despite increasing lever arm length?

💡 Explanation

When lever arm length increased on Roman torsion siege engines, higher frame stress fracturing occurred because longer arms amplified the torque, exceeding material strength. Therefore enhanced frame stress fracturing resulted, rather than reduced projectile payload, higher air resistance, or higher rope elasticity, which are less directly affected by frame strength.

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