On line sources
If you go to an on-line soource like PYI Inc with your boat size, engine, shaft size, and your transmission gear ratio, they can give you a recommended propeller appropriate for your boat. There is a good article on propellers in this month's issue of Sail Magazine that compares several manufacturer's folding and feathering props. They are obviously in a wide range of price categories depending on size and type.They are probably all very good applications, and everyone is going to have their own preference, depending on needs.