Which type of engine is most commonly mounted on the transom of a boat?

The outboard engine is the most commonly mounted type of engine on the transom of a boat due to its versatility and ease of use. Outboard engines are typically external to the boat's hull, allowing for straightforward installation and removal. This configuration provides several advantages, such as saving space inside the boat's engine compartment, easier access for maintenance and repairs, and the ability to quickly replace the engine if needed.

Additionally, outboard engines are popular for smaller boats and recreational vessels since they can be easily tilted up out of the water when not in use, reducing drag and allowing for a safer and more efficient storage or docking process. Their design also allows for a range of power outputs to suit different types of boating activities, from fishing to leisurely cruising.

In contrast, while inboard engines and sterndrive engines are commonly used in various types of boats, they are generally installed within the hull, which can complicate maintenance and limit space. Electric engines, though gaining popularity, are not as widely used on transoms compared to outboard engines, especially for traditional and larger boats. Therefore, the outboard engine's practical advantages contribute to its widespread use as the primary choice mounted on the transom of boats.