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Picking The Right Prop

Posted by Chris on Dec 2nd 2014

One of the questions we are asked the most is, “What outboard prop SHOULD I be using?” In order to answer this question, the more information we have, the better. Below, I will list some of the information that is most helpful to us:

  • What prop is on the boat now?
    • The size or part number is usually stamped on the hub (either top or bottom), or between the blades on the outside of the prop.
    • The size will look like the following: Diameter X Pitch, (ie, 14-3/4X21)
  • What is your wide open throttle (WOT) RPM’s? (along with the current prop size)
    • WOT RPM’s are the most important piece of information you can provide us with. It tells us what props you can and should use.
    • Even if you don’t run your boat at WOT, the number is still important to us.
  • What is your engine manufacturer’s WOT RPM range?
    • WOT RPM range will be in your engine manual.
    • Michigan Wheel provides a rough guide in the following link: Michigan Wheel RPM Chart.
  • What is the length of your boat, and is it a heavy boat (fiberglass, workboat, etc)?