What does a propeller do?

A propeller plays a crucial role in the movement of a boat by rotating and generating thrust. When the engine drives the propeller, its blades push against the water, propelling the boat forward or backward, depending on the direction of rotation. This mechanical action is fundamental to the boat's navigation, allowing it to move through the water effectively. Understanding the function of a propeller is essential for boaters, as it directly impacts how they control the vessel's speed and maneuverability on the water. Other options, while relating to boating, describe functions that are not performed by a propeller. For example, holding an anchor refers to a different component entirely, while indicating direction and supporting the hull relate to navigational aids and the design of the boat, respectively.