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:
- What is your current propeller size? (Size and stock number can be found on the propeller)
- What is the maximum rated RPM range for your motor? (refer to your owners manual, boat dealer, or engine manufacturer)
- 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.
No current propeller?
We can accurately suggest a propeller size. Propeller sizing is subject to sea trial as stated above to assure the propeller size is correct for your application.
Fill Out Our Propeller Sizing Form
Here is the information we need to size an inboard propeller correctly.
Disclaimer: Kruger Propeller offers propeller size suggestions as a free service to the public. Propeller sizing is very complex and subjective in nature. All propeller suggestions are subject to sea trial and are offered at the sole risk to the consumer. Kruger Propeller assumes no liability for damages as to the outcome of our propeller suggestions.
Kruger & Sons
4463 26th Ave W.
Seattle, WA 98199
(206) 283-7707 – Local
(800) 762-7767 – Toll Free
(206) 283-0586 – FAX
Hours
Monday – Friday
8:00 AM – 4:30 PM PST
Saturday-Sunday: Closed