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← HistoryWhich 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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