The propellers can be cleaned and polished. A propeller may be replaced if they have any major damage or according to their manufacture's introduction. Cleaning can be done either underwater or when the ship going to dry dock. Further more Propeller can be relatively smooth or rough as a result of cavitation damage to the metal surface itself, calcium deposits, mechanical damage, and marine fouling, including slime algae, barnacles, and organisms. During dry docking, a propeller is always subject to splashes of conventional anti-corrosive or anti-fouling paints, which increase the surface roughness of the blade.
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5 years and they need completely new blades?? Or have the original ones been refittet/refurbished and polished?
The propellers can be cleaned and polished. A propeller may be replaced if they have any major damage or according to their manufacture's introduction. Cleaning can be done either underwater or when the ship going to dry dock.
Further more Propeller can be relatively smooth or rough as a result of cavitation damage to the metal surface itself, calcium deposits, mechanical damage, and marine fouling, including slime algae, barnacles, and organisms. During dry docking, a propeller is always subject to splashes of conventional anti-corrosive or anti-fouling paints, which increase the surface roughness of the blade.