What are the Functions of a Ships Thrust Blocks, Propeller Shafts, and Stern Tubes?

The thrust block, propeller shaft and stern tube ensure the power from the main engine is transmitted with optimum efficiency. A thrust block counteracts the torque produced by the rotating propeller by transmitting the torque down through its hold-down bolts into the reinforced ships structure. The propeller shaft is made up of numerous sections of machined forged steel sections complete with couplings which are bolted together. It transmits the engine power along the shaft tunnel through the stern gland to the propeller. The stern gland consists of a long tube which supports the propeller shaft where as it passes through the hull. The supporting bearing is of white metal being lubricated and cooled by oil, shaft seals preventing oil leaks