What is the primary function of the main engine on a ship?

The primary function of the main engine on a ship is to provide propulsion, which is essential for moving the vessel through the water. The main engine, often coupled with a reduction gear, converts the energy produced by burning fuel into mechanical energy that turns the propeller, allowing the ship to navigate and maintain speed. This function is critical for all aspects of maritime operations, whether at sea or maneuvering in ports.

While engines can be involved in other functions, such as providing mechanical energy to auxiliary systems, the main responsibility of the main engine remains propulsion. Therefore, acknowledging its role in moving the ship and its relation to the reduction gear highlights the fundamental purpose of the main engine in the vessel's operation.