What is the function of strut bearings in a propulsion system?

Strut bearings play a crucial role in a propulsion system by providing structural support to the weight of the shaft. These bearings are designed to accommodate the axial and radial loads that arise during the operation of the propulsion system. By supporting the shaft's weight, strut bearings help maintain the mechanical stability of the system, ensuring that the shaft remains properly positioned and aligned.

When a shaft rotates, it experiences various forces, including those from the thrust generated during operation. Strut bearings help manage these forces by distributing the load evenly and preventing undue stress on other components. This support is essential for the overall durability and performance of the propulsion system. Without proper support from strut bearings, there could be premature wear and potential failure of the shaft or related components due to misalignment or excessive load.

Other options do not correctly represent the primary function of strut bearings. For instance, increasing speed is typically achieved through design and engineering of the propulsion system rather than the function of bearings. While bearings can contribute to efficiency and performance, their primary role is not power transfer or improving alignment, though they can incidentally assist in these areas by maintaining the appropriate positioning of the shaft.