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Controllable Pitch Propellers Essay

1429 words - 6 pages

Controllable Pitch Propellers CPP (adjustable pitch propellers)
The blades of this type of propeller can be turned, thereby changing the propeller pitch. These propellers are more complicated than fixed-pitch propellers. The mechanism that adjust the propeller pitch is located in the boss of the propeller. It is activated from the engine room, remotely controlled from the bridge by a hydraulic cylinder. The most striking features of the controllable pitch propellers is that it only rotates in one direction, making the reversing clutch or the reversible engine obsolete. Unlike the fixedpropeller, the controllable pitch propeller is an integrated part of the propulsive system. This makes it ...view middle of the document...

A correctly sized Controllable Pitch Propeller on the other hand is able to be efficient at a wide rpm range, and at a wide variation in vessel loading. This is so because the propeller pitch can be adjusted as needed in order to absorb all the power that the engine is capable of producing at nearly any rpm. Even aboard a planning power vessel, one can use a CPP to provide fine pitch and higher rpm to get going, and a heavier pitch with reduced engine rpm once up to speed. If the vessel has two engines, and speed is to be low, one engine can be dropped out, and its propeller feathered fully to remove the drag of the stopped propeller. The Controllable Pitch arrangement will permit a skipper to vary the engine rpm in service as needed to obtain the most favourable reduction in engine vibration and noise, as well as to vary the pitch (and therefore alter blade loading) to eliminate cavitation at any rpm. Finally, there will be no anxiety as with a Fixed Pitch Propeller over whether or not the correct Fixed Pitch has been calculated for the combination of vessel and engine. With the wrong fixed pitch propeller, efficiency can be very poor indeed.

Hydrolic System of CPP
The pump and motor unit forms an essential part of the hydraulic system. This assembly delivers the oil quantity needed for adjustment of the propeller blades and produces the pressure required for pitch control. Two electrically driven pumps (1 active pump, 1 standby pump, each with 100% capacity) are mounted on the cover of the hydraulic tank, with the pumps running in the oil. The compact control block, incorporating all the indicators and the individual instruments necessary for pitch control, is located on the top of the tank.

The piping between the pump and motor unit and the oil supply unit is part of the shipyard’s scope of supply. Lubrication oil is fed through the stern tube into the hub. This system is not connected to the hydraulic system of the controllable-pitch propeller unit. Optionally a two-pipe system can be supplied, in which case the hydraulic oil is used to lubricate the hub. Fig.1 In Fig. 2 it is to recognizable the inlet of the hub.

1

2

Typically hydraulic scheme for a CPP Fig.3

3

Principal Work of CPP Blades for Moving
The blades of this type of propeller can be turned, thereby changing the propeller pitch. These propellers are more complicated than fixed-pitch propellers. The mechanism that adjust the propeller pitch is located in the boss of the propeller. It is activated from the engine room, remotely controlled from the bridge by a hydraulic cylinder. The most striking features of the controllable pitch propellers is that it only rotates in one direction, making the reversing clutch or the reversible engine obsolete. Unlike the fixedpropeller, the controllable pitch propeller is an integrated part of the propulsive system. This makes it possible that power and necessary propulsive forces can all be controlled by simply changing the...

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