An outboard engine is a versatile and popular type of propulsion system used primarily in small to medium-sized watercraft, such as boats, dinghies, and even some personal watercraft like jet skis. It consists of an internal combustion engine, a gearbox, and a propeller, all housed in a single unit that is mounted externally to the transom or rear of the boat. This design provides numerous advantages in terms of portability, maneuverability, and maintenance.

1. Engine: Outboard engines are usually powered by gasoline (petrol) or diesel engines, with most smaller models utilizing two-stroke or four-stroke engines. These engines provide the necessary power to drive the propeller and propel the watercraft forward.

2. Gearbox: The gearbox or lower unit contains the gears, shafts, and other mechanisms that transfer power from the engine to the propeller. It also allows for shifting between forward, neutral, and reverse gears.

3. Propeller: The propeller is the crucial component responsible for generating thrust and propelling the boat through the water. Propellers come in various sizes and configurations, depending on the boat’s size, weight, and intended use.