Choosing a prop is certainly not an exact science. But the...

Choosing a prop is certainly not an exact science. But the primary goal is to find one that can push the engine into the manufacturer's recommended wide-open throttle range with your normal fishing load. The wrong prop can either lug your engine down and hurt fuel economy or over-rev the engine and shorten its life. After that it's a matter of fine-tuning to meet your particular needs.