The rudder of a ship is the main steering component and the appendage of the hull, generally situated in the aft end;
a rudders is made of two main elements:
STOCK
HULL
PROPELLER SHAFT
BLADE
RUDDER STRUCTURE
A rudder can be structured in three different ways, which differ based on the position of the blade with respect to its rotation axis.
The latter is called “compensated rudder” because the position of the rotation axis is at 1/3 or near to the middle of the blade, and the forces acting on the rudder are neutralized because they are automatically compensated, thus allowing the rudder to remain in place.
As a mechanical workshop, we process and supply stocks and blades, and we additionally provide the coupling of these two elements. In this particular procedure, the Prussian blue contact test is pivotal; a blue pigment called “Prussian blue” or “engineers blue” is mixed with oily substances and laid on the metallic surfaces of the stock and the blade’s areas of interest. These surfaces are put in contact and rubbed against each other, and any potential removal of the pigment indicates the location of the detected points. This test is carried out to prove the regularity of a given surface or support.
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