🔍 Key Concepts

• Effect of removing weight on a vessel’s vertical center of gravity (KG) and longitudinal center of gravity (LCG) • How to compute the change in KG (or KGL) using moments: weight × vertical distance • Difference between KG and KGL in the context of a sample load form problem

💭 Think About

• When you remove a weight high above the keel, what happens to the ship’s KG: does it go up or down, and why? • How do you compute the moment of the removed weight about the keel, and then turn that moment into a change in KG using the ship’s displacement? • How is KGL defined in the sample load form, and what does an ‘improvement’ in KGL mean numerically?

✅ Before You Answer

• Confirm the ship’s displacement from Sample Load Form #4 before making any calculation • Use consistent units: long tons for weight and feet for distances; check for any need to convert • After finding the change in KGL, check that the sign (increase or decrease) is consistent with removing a high weight and that the magnitude is reasonable compared to the vessel’s depth and KG value