While loaded as shown in Sample Load Form #5 (Survival), an estimated 250 long tons of snow and ice accumulates on the DEEP DRILLER at an estimated height of 127 feet. Assuming no corrective ballasting, what is the rise in the height of the center of gravity corrected for longitudinal free surface effects?
• Shift of center of gravity (KG) when adding weight at a vertical distance above the existing KG • Use of the GG = (w × d) ÷ W relationship for added/removed weights • Effect of longitudinal free surface correction (FSC) on the corrected KG in the specific loading condition shown on Sample Load Form #5 (Survival)
• First, determine the ship’s displacement (W) and original KG from Sample Load Form #5 before any snow/ice is added. How will this help you compute the basic rise in KG? • Compute the vertical distance (d) between the original KG and the height where snow/ice is added (127 ft). How does this distance enter the GG formula? • After finding the basic rise in KG from the added weight alone, think about where the longitudinal free surface correction is already accounted for in the load form and whether you need to adjust your final KG value.
• Confirm the displacement (W) and existing KG (or KGc) on the Survival load form before the snow/ice is added. • Check that you are using long tons for both the added weight and the displacement so the GG formula units are consistent. • Verify whether the load form’s listed KG is already corrected for longitudinal free surface; if so, be sure your final answer is a corrected KG after adding the snow/ice and then compare the rise (difference) with the choices.
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