Towing & Ship-Assist · Gear — Shock Loading
Lengthening the towline (more catenary) in heavy weather helps because the increased sag:
- AAbsorbs surging shock loads, smoothing peak tensions on the towline✓ Correct
- BReduces the breaking strength needed
- CMakes the tow steer better only
- DIncreases the tug's speed
Explanation
The catenary (sag) of a long towline acts as a spring: as the tug and tow surge, the towline straightens and sags, damping the peak (shock) loads that could otherwise part the line. Towlines are shortened in shallow water and lengthened in a seaway.
Authority: Knight's Modern Seamanship; towing practice
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