The propulsion force of a ship primarily relies on the propeller, and the propeller shaft (tailshaft) needs to be supported by bearings. Inside the tailshaft tube, a tail bearing is typically installed. For small vessels, rubber bearings may be used. These bearings offer excellent elasticity and wear resistance, enabling them to accommodate tailshaft oscillations and a certain degree of eccentric operation. For instance, in some small yachts, when the yacht operates under varying navigation conditions (such as high-speed travel or turning), the tailshaft may experience vibration and displacement. Rubber bearings can effectively cushion these forces, reducing wear between the tailshaft and the bearing.  For large vessels, especially ocean-going ships, white metal bearings are widely utilized. White metal (Babbitt) bearings exhibit superior corrosion resistance and load-bearing capacity, allowing them to withstand the immense axial and radial forces exerted by the propeller. During navigation, the propeller faces resistance from seawater and the power transmitted by the main engine, generating complex forces. White metal bearings ensure stable rotation of the tailshaft, maintaining the ship's propulsion efficiency.