What is the primary job of the rudder?

• A. To accelerate the vessel
• B. To stabilize the vessel
• C. To control engine speed
• D. To steer the direction

Answer: (D)

The rudder’s main job is to steer the vessel by deflecting the flow of water to create a turning force that changes the boat’s heading. When you turn the helm, the rudder swings to redirect water flow, pushing the stern one way and the bow the other, which alters the vessel’s direction. It doesn’t accelerate the boat (that’s the engine and propellers), it doesn’t stabilize the hull (which involves balance and load distribution), and it doesn’t control engine speed (that’s the throttle). So steering the direction is the function that best fits the rudder’s purpose.