What is the function of a drive shaft in a watercraft?

The drive shaft in a watercraft serves as a crucial link between the engine and the propeller or impeller, allowing the transfer of power generated by the motor to drive the vessel through the water. By connecting these two components, the drive shaft enables the propulsion system to function effectively. When the motor runs, it turns the drive shaft, which in turn spins the impeller or propeller, creating thrust and moving the boat forward.

Other options describe components and functions that are not related to the role of the drive shaft. For example, parts that control the boat's speed or assist with steering are separate systems that operate independently from the drive shaft’s primary function of power transmission. Understanding the drive shaft's role helps clarify how propulsion systems are integrated in watercraft design and operation.