🔍 Key Concepts

• Twin-screw vessel maneuvering – how each propeller affects the vessel when used alone • Propeller rotation (right-hand vs left-hand) and its sideways (transverse) thrust when going ahead • Location of the pivot point when a vessel is moving ahead slowly

💭 Think About

• Picture looking at the ship from above: if only the starboard propeller is turning ahead, which side of the stern is being pushed back, and which way must the bow swing? • Think about which way a typical right-hand propeller pushes the stern sideways when going ahead. How does that sideways push affect the bow? • If the thrust is applied off the centerline (only on the starboard side), will the vessel move straight ahead or pivot around a point near the bow?

✅ Before You Answer

• Decide whether you are assuming a conventional twin-screw ship with one right-hand and one left-hand propeller • Make sure you know which propeller (starboard or port) you’re imagining turning ahead, and what that does to the stern first • Verify that with thrust on one side only, the vessel experiences a turning moment, not just straight-line motion