Thanks Cal for your comments on outboards. The Michigan Wheel Marine Master Catalog, which you can download from their website, has a great listing of props and gear ratio by make/model/year.
I found that an Evinrude/Johnson circa 1980 9.9 or 15 hp (apparently the same lower end for both) has a gear ratio listed as 2.42:1, which is right about what I calculated as a good starting point. In addition, 3 blade props for those are available as 10 x 7 which seems like a good starting point for my boat. Those are 13 spline hubs.__._,_.___
Posted by: John Acord <jcacord@gmail.com>
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