🔍 Key Concepts

• Single-screw, right-hand propeller behavior when going ahead • Difference between propeller wash/currents and lateral (sideways) forces on the stern • How propeller action makes the stern swing one way and the bow swing the other

💭 Think About

• First, picture a single-screw vessel moving ahead with a right-hand propeller. Which way does the stern tend to move, and therefore which way does the bow turn? • Which of the answer choices describes a force acting sideways on the hull, rather than water simply moving aft with the propeller wash? • Ask yourself: when handling vessels in close quarters, what specific propeller effect makes the stern ‘walk’ sideways, even if the rudder is amidships?

✅ Before You Answer

• Identify which term refers specifically to lateral (sideways) force on the stern caused by the rotating propeller • Separate in your mind currents/wash (discharge or suction) from an actual sideways pushing force on the vessel • Confirm which effect is commonly called “propeller walk” or “paddle-wheel effect” in practical shiphandling