Controllable Pitch Propeller (cpp) & fixed pitch propeller. (definition and difference)

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Sl. No Solid / Fixed Pitch Propeller Controllable Pitch Propeller
1 Speed of Ship is controlled by varying the speed of Engine Speed of the ship is controlled by varying the pitch of the propeller
2 Engine with varying speed is required Engine with constant speed is enough
3 Hence Shaft driven auxiliary cannot be fitted Hence Shaft driven auxiliary can be fitted
4 Astern movement of the ship is by reversing the engine {engine should be of reversing type} Astern movement of the ship is by varying  the pitch of the propeller {unidirectional engine is enough]
5 Full power of the engine is not available during astern running Full power of the engine will be available during astern running also
6 Hence Stopping time and distance is more Hence Stopping time and distance is less
7 Manoeuvring in confined water is difficult Manoeuvring in confined water is easy
8 Propeller efficiency is more Propeller efficiency is less since large diameter boss/hub is required
9 Cost is low  Cost is high
10 Cost of repair and maintenance is less Cost of repair and maintenance is more

 

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