Brian, a couple of the guys posted these links a while back. They may be a help to you. If not, hang on as I'm sure the guys will have plenty of good advice for you.
Ferm posted this one:
http://www.rbbi.com/folders/prop/propcalc.htm
BS posted this one:
http://continuouswave.com/cgi-bin/propcalc.pl
Steve
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1990 Hydrasports 2000cc Vector with 96 200HP Oceanrunner.
Saved by grace alone, through faith alone, in Christ alone
http://www.providencerpchurch.com/
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