🔍 Key Concepts

• Effect of propeller rotation on vessel maneuvering • Difference between forward pushing force and lateral (sideways) force from a propeller • Common terminology for propeller-induced stern movement

💭 Think About

• Ask yourself: which option best describes a force that makes the stern move sideways rather than straight ahead or astern? • Consider which term is normally used for the main driving force pushing the vessel ahead, and which term refers specifically to sideways or transverse effects. • Think about what this phenomenon is commonly called when explaining why a vessel’s stern “walks” to port or starboard when going astern.

✅ Before You Answer

• Identify which choice refers to the main driving force along the vessel’s fore-and-aft line. • Identify which choice refers to a lateral or transverse effect of the propeller rather than forward motion. • Eliminate any terms that are not standard seamanship vocabulary for propeller-induced stern movement.