While in ocean transit, the COASTAL DRILLER experiences a single amplitude roll of 5 degrees. What is the minimum roll period that does not exceed the design limits of the legs?
Official USCG Answer & Rule Citation
Correct Answer: Option D — 7.2 seconds
Dynamic structural analysis for the COASTAL DRILLER mandates a minimum roll period of 7.2 seconds during ocean transit to prevent excessive leg bending moments caused by resonance.
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