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← HistoryWhich consequence results when improperly tanned Viking longship sails weaken?
A)Increased permeability, reduced propulsive force✓
B)Decreased weight, increased maneuverability
C)Enhanced ultraviolet degradation resistance
D)Improved water resistance, faster voyages
💡 Explanation
Reduced tanning introduced excess fats that decompose sail fibers, initiating a creep rupture because sails experienced sustained tensile loads and biological attacks. Therefore, permeability rises and propulsive force degrades, rather than enhancing favorable sail properties because creep accelerates weakening of sailcloth.
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