The relationship between the performance of the ships propeller and the Vessels Main Engine is crucial, which is why naval architects and engineers are still working on issues which will increase the energy transferred from the ships main engine to the water via the propeller. All performance test by builders, Engine and propeller manufactures and ship yards’ world wide are done with the optimum and maximized design of the ship’s selected propeller while the propeller is new and totally clean with a very smooth surface.
As Vessels stops and idle for days and even weeks at times, the propeller becomes a sacrificial “anode” for marine growth such as sea grass and barnacles which does find the clean poison free bronze, nickel, aluminum and stainless steel alloyed smooth propeller surface, far more attractive than the poisonous aggressive anti fouling which surrounds it on the ships hull and rudder. As soon as the tough “acorn barnacles” get their grips to the propeller surface they become impossible to get rid off unless mechanically removed by either blades, scrapes or brushes, in addition their very rough and resistant shells becomes a good base for further growth such as marine algae and sea grass.
The need to refit and maintain the surface of the propeller becomes unquestionable as time progresses between the ships dry docking intervals. which today may last up to 5 and even 7 years. The correct cleaning of the propeller is done by use of mechanical scrapes to move the first thick layer of marine growth, and then a throughout and careful polishing of the entire propeller, its hub, pressure and vacuum sides of each blade, to achieve and immediate and effective reduction of fuel consumption and reducing ship costs.
The many advantages of the in water propeller polishing are:
- Increase and improvement of vessel’s performance
- Reduced fuel consumption
- CO2 emission reduction of gases in the marine environment
- Increase of vessel’s the speed
- Reduction of unwanted vibrations due to cavitation
- Stress Reduction of the propeller axis and the vessel’s machinery
- Increased reliability
- Expansion of vessel’s maintenance cycles
- Reduce slippage