An important parameter for a marine diesel engine is the rating figure, usually stated as bhp or kW per cylinder at a given rev/min. The principal propulsion devices, including fixed pitch propellers, ducted propellers, podded and azimuthing propulsors, contra-rotating propeller, overlapping propellers, tandem propeller, controllable pitch propellers, and cycloidal propeller, waterjet propulsions are briefly reviewed by outlining their major features and characteristics together with their general areas of application. The auxiliary machinery may be in support of the main propulsion engines and include heat exchangers and compressed air, or in support of ship and cargo handling such as propellers and shafting, steering gear and deck cranes, or in support of ship services such as ballast water arrangements and sewage systems. Machinery is often divided into the main or propulsion engines, electrical generation, systems such as electrical, piping, refrigeration and air conditioning, fire fighting and protection, deck machinery and cargo handling equipment, bow thrusters and stabilizers, instrumentation and control, safety equipment, and other auxiliary machinery and equipment. This chapter provides an overview of the main and auxiliary machinery and equipment found on ships.
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