All- Thanks. I think that the suggestion about contacting Sabre is one that I will take. Don't know why I didn't think of it. I've called them a number of times over the years and they've been great.
Unfortunately, I can't use the calculators. There are too many variables that I don't know. To be honest, I've never paid much attention to prop size and diameter. Sabre spent the time to spec it out so it's good enough for me. I mostly make sure that the prop is free of knicks and is reconditioned every 10 years or so.
Sabre 38 "Victoria"