The COASTAL DRILLER, while in a normal transit, experiences single amplitude rolling of three degrees. What is the minimum period of roll which does not exceed the design limits of the legs?

Correct Answer: Option C — 5.5 seconds

Leg structural integrity during transit is heavily influenced by dynamic amplification caused by rolling. Per marine engineering limitations for self-elevating units, a minimum roll period of 5.5 seconds prevents excessive bending moments from overstressing the cantilevered leg structures.