GENERAL RULE OF PROP SELECTION: On a properly trimmed boat a prop of the correct pitch and diameter will permit the motor to attain it's maximum rated RPMs but NO MORE.
HOW TO BUY THE CORRECT PROP: The best method of prop selection that I know of is to find a dealer that will let you try several props with the understanding that you will buy the one that performs as above. Of course it is also understood that if you ding a test prop you will buy it.
Contributed by hl.