What is the primary function of a drive shaft in a boat?

The primary function of a drive shaft in a boat is to connect the motor to the impeller. This connection is crucial for transferring the engine's power to the propulsion system, allowing the boat to move. The drive shaft transmits the rotational force produced by the engine to the impeller or propeller, which then generates thrust to propel the vessel through the water. Understanding this function is fundamental for boating operations and maintenance, as it relates directly to the efficiency and functionality of the boat's propulsion system.

The other options describe different components and functions not related to the drive shaft. Steering is accomplished through rudders or other steering mechanisms, controlling sail angles applies to sailboats using wind for propulsion, and providing buoyancy is a property associated with the hull design, ensuring that the boat floats on water. Thus, recognizing the specific role of the drive shaft is essential for comprehending how a boat moves through the water efficiently.