A propeller is engineered to last throughout the lifetime of a vessel. During its operation factors, such as biological growth on the hull and a change in operating conditions, can result in the relationship between the propeller and the engine being disturbed.
When the effect becomes too serious, engine overload is inevitable. In most cases, this is noticeable by black smoke emerging from the exhaust pipes. This results in higher fuel consumption and increased wear to the pistons, liners and valves, and with that higher maintenance costs. It is estimated that 20% of the world’s fleet suffers from heavy running propellers, whilst the solution by means of modification is within reach and has proven to be very effective.