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This chapter focuses on the design of the propulsion shafting, the shaft bearings and their lubrication. The propeller hydrodynamic design and the design of reduction gears are presented in other chapters and are not repeated here. Although the fundamentals outlined in the following sections apply to all types of prime movers and propulsors, the discussion is for a propulsion plant using a fixed-pitch propeller and a geared diesel prime mover in order to avoid being unduly confusing in the discussion. However, considerations are discussed where the selection of a prime mover has an influence on the shafting design.