SHIPBUILDING

Controllable pitch propellers

As a mechanical workshop, and as to accompany our components for propulsion shaft lines, we process and supply internal components for controllable pitch propellers.

INTERNAL MANEUVERING DUCTS
i.e. tubing systems which allow their movement

ACTUATOR CYLINDERS
BLADE-HOLDER DISKS
HEAD-CROSS PISTONS
MAIN SHAFTS

Controllable pitch propellers

MECHANICAL PROCESSING

A propeller is defined as controllable pitch propeller if it is designed in a way that allows the blades to rotate around its longitudinal axis, thus changing its pitch. Therefore, the pitch angle is variable, because, to its fluctuation, we observe a variation in the travelled distance in the sea to a complete rotation of the propeller.

The pitch adjustment function is put in place thanks to the maneuvering tubing system, through a hydraulic circuit, that also allows to invert the motion without reversable engines kicking in, but instead relying on four-stoke diesel engines.

The ability of these propellers to change the orientation of the blades along their longitudinal axis can be purely mechanical (tie-rod blades) or servo-hydraulic.

The mechanical handling is applied to medium-small propellers, while the servo-hydraulic one, instead, applies to medium-large propellers.

The latter is composed as follows: in the propeller hub there are the cylinders and the blade-holder disks that physically rotate the blades, the oil in pressure is instead made subservient to the propeller hub through internal oil tubes.

This tubular system, running inside the propeller shaft and usually also in the first intermediate one, can reach lengths ranging from 13 to 19 meters.

Unlike fixed-pitch propellers, used mostly on vessels cruising on a constant speed, controllable pitch propellers are used for their higher maneuverability, and thus employed on vessel that exploit a higher range in speed and variable propulsion conditions, also towing wise. A further advantage of these propellers is identified in their optimization of the engine’s power absorption, leading to a fuel consumption reduction; moreover, the hull breakout space is significantly reduced, thanks to its faster reaction time.

For any info or quotation, please contact the sales department

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