I am new owner of a used sm (227). I did not use it much until know. The boat is well maintained and in very good condition, we like it very much. Nevertheless, there seems to be a problem with algae development on the propeller when the boat lays for a few weeks in the marina. Actualy the boat is in SanRemo in the Med. After a few weeks not beeing used, the engines gets up to 1700t/m instead of 2500 or more. The previous owner had evertime asked a diver to clean the propeller before navigating. Has anybody experience in solving this problem. Or is the only way diving and cleaning? Thanks Paul