Which type of boat propulsion uses an engine mounted inside the hull?

The type of boat propulsion that uses an engine mounted inside the hull is inboard propulsion. This setup means that the engine is situated within the boat's hull, typically connected directly to the propeller via a drive shaft. This configuration offers several advantages, including a more streamlined hull, which can lead to better fuel efficiency and handling. Inboard engines also tend to be quieter compared to outboard engines since they're housed inside the boat, providing a more comfortable experience for passengers.

Outboard engines, on the other hand, are mounted externally on the transom of the boat and are designed to be easily removable. Stern drive systems combine elements of both inboard and outboard engines, utilizing an inboard engine but driving the propeller through an outboard unit. Personal watercraft typically have their propulsion systems designed differently and utilize a jet drive, which draws water into the craft and expels it, allowing for unique maneuverability. Understanding these distinctions is crucial for recognizing the various boat propulsion methods and their configurations.