sisäperämoottori

A sisäperämoottori, also known as an inboard/outboard engine or sterndrive, is a type of marine propulsion system that combines an internal combustion engine with a drive unit that is mounted outside the hull of the boat. The engine itself is located within the boat's hull, typically in the stern, similar to a traditional inboard engine. However, it is connected to a drive unit that protrudes through the transom and extends into the water. This drive unit contains the propeller, gearbox, and steering mechanism, and can be tilted up and down.

This design offers several advantages. It allows for a more powerful engine to be placed inside the boat, which can provide better weight distribution and a quieter operation compared to an outboard motor. The external drive unit is generally more streamlined than a full inboard setup, leading to improved hydrodynamic efficiency and shallower draft capabilities. Maintenance can also be convenient as the engine is readily accessible within the boat, while the drive unit can be trimmed for various water conditions or raised for trailering and storage.

Sisäperämoottorit are commonly found in a wide range of recreational boats, including runabouts, cruisers, and sport boats. They offer a good balance of performance, fuel efficiency, and ease of use. The drive unit can be a fixed-mount or a tilt-and-trim unit, allowing the operator to adjust the angle of the propeller for optimal performance and maneuverability.