Your vessel's drafts are: FWD 27'-06", AFT 28'-02"; and the KG is 23.1 feet. Use the selected stability curves in the blue pages of the Stability Data Reference Book to determine the remaining righting arm at 60° inclination if the center of gravity is 2.4 feet off the centerline.
• Cross curves of stability (GZ curves) and how to read the righting arm at a given heel angle for a specific draft/dispacement • Effect of off-center KG (transverse shift of G) on the righting arm at a given heel angle • How to apply the cosine correction or geometric reduction of GZ when G is off the centerline
• From the blue pages, what is the original GZ at 60° for the vessel at these drafts and KG before considering the 2.4 ft off-center shift? • How does a transverse shift of G by 2.4 ft change the righting arm at 60°—does it increase, decrease, or leave it unchanged, and by about how much? • Compare the magnitude of the off-center correction to the original GZ value: would you expect the remaining righting arm to be large, small, or nearly zero?
• Make sure you select the correct displacement/draft curve in the Stability Data Reference Book for FWD 27'-06" and AFT 28'-02" • Verify that you are using the right formula for reducing GZ due to a transverse shift of G (off-center KG), including the correct trigonometric function and angle in degrees • Double-check the units (feet) and that you’re applying the correction to the GZ at 60°, not to another angle like 30° or 40°
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