While in ocean transit, the COASTAL DRILLER...

Question 1 of 2707066636ee728f7522a1c518445

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?

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Question 1 of 27070

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?

🔍 Key Concepts

• Relationship between roll period and GM (metacentric height) • How shorter vs longer roll periods affect acceleration and structural loads at a fixed roll angle • Basic proportionality of angular acceleration with respect to roll period for a given amplitude

💭 Think About

• For a fixed roll angle of 5°, what happens to the rate of motion and acceleration if the period is very short compared to if it is longer? • If the legs have a maximum allowable dynamic load, would that be exceeded more easily by a quick, snappy roll or by a slow, gentle roll? • Among the choices, which period would give the least severe dynamic loading on the legs for the same 5° amplitude?

✅ Before You Answer

• Be clear that roll period is the time for a complete roll cycle, not the angle itself. • Remember that, for a given angle, shorter periods mean higher accelerations and forces; longer periods mean lower accelerations. • Before picking an option, compare which choice would keep dynamic loads on the legs within design limits by making the motion less violent.