What supports the weight of the main propulsion shaft outside the hull of the ship?

The correct answer is the strut bearings, which play a critical role in supporting the weight of the main propulsion shaft that extends outside the hull of the ship. Strut bearings provide structural support and also help to align the shaft, allowing it to rotate smoothly while also minimizing wear and tear on the shaft itself and the surrounding components.

The main propulsion shaft must be securely supported where it penetrates the hull to ensure proper operation and to prevent any misalignment or vibrations that could lead to damage. Strut bearings are designed specifically for this purpose and are typically positioned at intervals along the shaft to maintain its stability and integrity.

In this context, while inner bearings and outboard bearings are also components used in the propulsion system, they primarily serve different functions. Inner bearings are located inside the hull and are typically utilized to support sections of the shaft that are not exposed, while outboard bearings are positioned at the outer end of the shaft, but they do not bear the main weight of the shaft as it extends outside the hull. Ball bearings, known for their ability to reduce friction, are used in various mechanical applications but are not the primary component for supporting the weight of the shaft in this scenario.

Understanding the role of strut bearings emphasizes their importance in marine