Mistress, I've got the same boat and engine as you do, and I'm starting to learn about propellers. I am going to take mine off, have it analyzed, and either recondition it or replace it based upon what some performance data tells me. Currently all I know is it is a 17" Michigan... I am curious what you are running? And do you think it is safe to say that this Cummins Mackinaw is about 6,000 lbs dry? Thanks again!