The controlling blade angle of a controllable pitch propeller enables the vessel to move forward or backward and stop more easily. When used with a side thruster, controllable pitch propellers are convenient when vessel speed needs to be changed frequently when entering or leaving port, leaving shore, or docking. In the case of an emergency stop, this type of propeller can immediately respond from full forward to full reverse movement.
Since the blade angle can be regulated, vessel speed can
be freely adjusted with the engine running at the most efficient
load. Use of a controllable pitch propeller can reduce fuel
and NOx emissions. Due to these advantages, this type of propeller
is used in a wide range of vessels, including fishing vessels,
tankers, ferries, and tugboats.
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Information on Controllable Pitch Systems