I am in the process of closing on a 78 Catalina 30. During the haul out and survey we noticed the prop was badly damaged. It was a two bladed composite (approx 9 inchs long). The surveyer recommended going with a steel prop but he wasn't real specific. Anyone have any recommendations on the size, material, and number of blades for a prop for my boat? It's got the Atomic 4 30 HP (or so they say).