Which risk dramatically increased when pre-19th century shipbuilders extended a wooden hull's length without scarf joint reinforcement?

💡 Explanation

When a wooden hull's length was extended without proper scarf joints, adequate hull girder strength wasn't maintained to resist longitudinal bending. This resulted in 'hogging' forces increasing because the hull was now longer with less sectional rigidity, causing deformation. Therefore susceptibility to hogging greatly increased, rather than worm infestation, fouling, or instability – which depend primarily on exposure over time but not length alone.

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