What is the main function of the keel in a ship's structure?

The main function of the keel in a ship's structure is to stabilize the ship. The keel acts as a critical structural element that runs along the bottom of the hull from the bow to the stern. This design helps to lower the center of gravity, which enhances the ship's resistance to rolling and pitching in the water. Consequently, a well-designed keel contributes significantly to the overall stability of the vessel, particularly in rough seas.

The keel also plays a role in the ship's directional control and helps it maintain a straight course by providing lateral resistance against the forces of wind and water. A deeper keel generally offers more stability and prevents excessive leaning during maneuvers.

While options regarding buoyancy and propulsion touch on aspects of ship design, they do not specifically pertain to the primary role of the keel, which is centered on stabilization. Support for the hull is relevant, but the intrinsic purpose of the keel goes beyond mere structural support; it is fundamentally about maintaining balance and stability on the water.