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Thank you VERY much for the links and the book suggestions Tom, I am definitely going to read all the suggestions you have made. I am studying the subject, and believe me, I see where you are active all over the net on this subject. Actually, I have found the perfect prop for the motor I am intending to repower with for my exact boat on another site. You were the one that recommended it there. I have the utmost respect for your knowledge on this subject, I never meant to imply otherwise. All I wanted was exactly what you just did, good solid reference material for study. I don't need to be as knowledgeable as you are because all I have is a couple of boats to prop. It just seems that everytime the discussion gets interesting on props around here, somebody gets mad, and the discussion gets ruined.