The one thing that is impossible to replace is experience, and we have over 30 years of it. It doesn't mean that we are smarter than anybody else, it just means that we have had plenty of opportunity to learn from our own mistakes. It also means that you can count on the help and advice you need when purchasing parts, propellers or complete engines.

Take a look at the links on the left  for some calculators and articles that you might find helpful.  The boat speed and prop slip pages are a "must see" for anyone interested in the best performance possible.