🔍 Key Concepts

• Bilge keels purpose and how they interact with water during a roll • Difference between rolling (side-to-side) and pitching (bow-up/bow-down) motions • How immersion depth/draft affects the bilge keel’s contact with the water

💭 Think About

• Think about which ship motion causes the bilge keel to move sideways through the water and create the most resistance. • Consider whether bilge keels work better when they are more or less submerged in the water. • Ask yourself: does a list (constant lean to one side) help or hurt the bilge keel’s ability to oppose rolling motion?

✅ Before You Answer

• Make sure you understand that bilge keels mainly resist rolling, not pitching. • Check which option would place more bilge keel area effectively in the water and increase hydrodynamic resistance during roll. • Eliminate any choices that relate to motions or conditions where the bilge keels aren’t doing much work.