This section will describe the major components and the principles of operation of the controllable reversible pitch (CRP) propeller (a part of the main propulsion system).

COMPONENTS OF THE CRP PROPELLER

Most ships that use CRP propellers use two independent units with their associated mechanical, hydraulic, and electronic pitch con-trol mechanisms, plus all the required valves and seals. Some type ships require tubing and passages for the discharge of prairie air through each pro-peller blade. The CRP propellers form an integral part of the ships two shaft main propulsion system. Figure 4-6 shows the major components of a single CRP propeller.

Figure 4-6.CRP Propeller Machinery.

Table 4-1.Related Propulstion System Components

Related propulsion system components, which are necessary for the operation of a CRP propeller but which are not part of the CRP propeller are listed in table 4-1. Lets look at some of these com-ponents, along with other components, shown in table 4-2.