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Which outcome was amplified in Viking longship voyaging when sailcloth material aged disproportionately across its surface?

A)Center of effort displacement
B)Ballast keel instability increase
C)Hogging stress along keel line
D)Rudder effectiveness amplification

💡 Explanation

Uneven sail degradation caused differential drag, resulting in translational *center of effort displacement*, because force vectors became asymmetrical. Therefore, ships experienced directional instability rather than efficient power transfer, since twist was induced.

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