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← HistoryWhich destructive event was Roman torsion siege engines vulnerable to, because of improper skein construction?
A)Shear stress leading to fracturing
B)Progressive untwisting weakening the arm✓
C)Bearing wear during rapid cycling
D)Excessive vibration causing shifting
💡 Explanation
Progressive untwisting caused reduced torsion because energy released during weapon firing induces stress on the rope skeins; slippage reduces torsion, undermining range, therefore untwisting is the failure, rather than shear in components.
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