I have a Chaparral 1830 SSI with a 4.3l V6 I/O, Alpha one unit. The prop is a 3-blade stainless design. I have some nicks in the blades from shallow water and typical bone head manuevers. No tears, no cracks, no major chunks missing.... i'm wondering when it is time to have the prop repaired. It does not seem to affect the boat performance, but maybe it is.