A controllable-pitch propeller (CPP) is a type of propeller with blades that can be rotated around their long axis to change the blade pitch. frequently used when the rotation rate of the shaft has to be constant due to the use of . Variation of the ship speed is then obtained by variations instead of variations of the rotation rate.
To change the a torque is necessary. To make CPP fail safe it is necessary to make the blade spindle torque such that the pitch increases to its maximum when the oil pressure in the hub fails. It is also important to limit the torque required to change the pitch.
Advantages
1. Fast stop manoeuvres are possible.
2. The main engine does not need to be reversible.
3. Fine control of thrust can be achieved without the need to accelerate or decelerate the propulsion machinery.
4. These propellers allow the main generator to be driven from the main engine which is efficient and cheap. Thus electricity can be generated with the efficiency of main engine and using the cheaper . Variable ship speeds can be obtained with constant propeller rpm as required by the generator.
| Controllable Pitch Propellers | ||||
| Type A and B is push-pull type, and type C is cylinder in hub type | ||||
| Model | Hub Type | Hub Diameter(mm) | Max. Propeller Diameter | Max. Power(KW) |
| ACIR-CPP001 | A B | 380 | 1500 | 850 |
| ACIR-CPP002 | A B | 450 | 1800 | 930 |
| ACIR-CPP003 | A B C | 530 | 2150 | 1300 |
| ACIR-CPP004 | B C | 570 | 2280 | 2500 |
| ACIR-CPP005 | B C | 630 | 2520 | 3000 |
| ACIR-CPP006 | B C | 720 | 2900 | 5000 |
| ACIR-CPP007 | B C | 790 | 3150 | 6000 |
| ACIR-CPP008 | B C | 850 | 3400 | 8000 |
| ACIR-CPP009 | C | 920 | 3700 | 11000 |
| ACIR-CPP010 | C | 1050 | 4200 | 15000 |
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Suitable for fish boat, tug, offsfhore cargo vessel, ferry, harbor service ship, oil tanker and other multi-operaion-condition ship or other ships which require high mobility. |
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