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Propeller Sizing

The correct propeller size allows the motor to achieve maximum RPM within the manufacturer's maximum rated RPM range at wide open throttle. If you are below the rated RPM range you need to purchase a propeller with less pitch. If you are over the maximum range you need to purchase a propeller with more pitch. One inch of pitch equals approximately 200 RPM on outboard and sterndrive applications. Inboard applications depend on reduction gear ratios and operating conditions.


Is your current propeller the correct size?

The following test run is required and is the most accurate way to correctly prop your boat. Run the boat at wide open throttle with the normal weight load and provide us with the following information:

  1. What is your current propeller size? (Size and stock number can be found on the propeller)
  2. What is the maximum rated RPM range for your motor? (refer to your owners manual or contact your boat dealer)
  3. What wide open throttle RPM can you achieve? (If the RPM continues over 200 beyond maximum back off)

You can download a PDF version of this checklist to save and use or print later.




Kruger & Sons

4463 26th Ave W.
Seattle, WA 98199
+1 (206) 283-7707
+1 (800) 762-7767
+1 (206) 283-0586 - FAX


Monday - Friday
8:00 AM - 4:30 PM PST

Saturday-Sunday: Closed

Seattle Propeller Service