Labor deals with the description of controllable pitch propeller. With an overview of the advantages and disadvantages compared with other types of propulsion, its application, manufacture materials are defined and choosen depending on the area of exploitation of the ship and the conditions placed in front of the screw. The greatest attention is paid to the main components of the swing mechanism and to the principle of their action. Because of the inevitable economy in ship exploitation, the basic principles of steering and regulation of this type of screw are mentioned. Since work on the screw can also be performed under water, the basic principles are stated, which we must adhere to, with special emphasis on environmental protection due to possible hydraulic oil spillage. At the very end, some of the major manufacturers are mentioned in the production of controllable pitch propellers and their components. Key words: