What is the function of an impeller on a vessel?

The function of an impeller on a vessel is to pump and force water under pressure. Impellers are crucial components in various types of marine propulsion systems, particularly in jet drive systems and some cooling systems. When the impeller rotates, it creates a low-pressure area that draws water into the system, and as the impeller continues to turn, it pushes the water out through a nozzle at a high velocity. This high-speed flow of water generates thrust, propelling the vessel forward.

Unlike steering mechanisms which direct the vessel's course, or electrical components that provide power, the impeller specifically deals with the movement of water to create propulsion. Similarly, while sails generate propulsion through wind rather than water, the impeller's function is overwhelmingly tied to the mechanical movement of water, making it essential for certain boat types, such as those using jet drives. Understanding the role of an impeller is critical for anyone involved in operating or maintaining vessels with this type of propulsion system.