🔍 Key Concepts

• Effect of transferring liquids on longitudinal moments and trim • Using the weight × distance moved method to find change in moment • The sign convention: when does a moment become an increase vs a decrease in the ship’s longitudinal moment

💭 Think About

• First, think about whether total drill water weight in the vessel changes when you transfer between two internal tanks. How does that affect total displacement? • Consider the fore‑and‑aft locations of tank 23 and tank 1 relative to the ship’s longitudinal center. When you move weight from 23 to 1, are you shifting weight forward or aft overall? • Compute the change in moment as (weight moved) × (distance between tank LCGs). Then think: does this new moment act forward or aft of the reference point you’re using?

✅ Before You Answer

• Check the tank plan or data sheet for the longitudinal centers (LCG) of tank 23 and tank 1 to determine the distance the weight is moved. • Confirm the weight of 2.0 feet of drill water in the tank (use tank capacity curves or data, not just volume = area × height, unless that is how the exam expects you to do it). • Before choosing an answer, be sure whether the shift causes the vessel’s longitudinal moment about the reference (often midships) to increase or decrease and that your calculated magnitude is close to one of the options.