What is the role of the strut bearing in a ship's propulsion system?

The strut bearing plays a critical role in supporting the weight of the propulsion shaft as it connects the hull of the ship to the shaft running through it. In a ship’s propulsion system, the shaft transmits power from the engine to the propeller, and it must be supported along its length to maintain alignment and prevent excessive wear or damage. The strut bearing serves as a fixed point that holds the shaft in place and allows it to rotate freely, which is vital for the efficient operation of the propeller.

Supporting the shaft externally also helps minimize vibration and maintain the overall integrity and balance of the propulsion system. A well-supported shaft ensures smoother operation, decreases the risk of misalignment, and prolongs the life of both the shaft and the associated components, like bearings and seals.

Other choices focus on different aspects that do not directly relate to the primary function of the strut bearing, such as power transmission, hull stabilization, or corrosion protection. While other components of the propulsion system may perform these functions, the strut bearing's main responsibility is specifically to support the weight of the shaft.