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PaulB
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What pitch should a 25hp out board propeller have

Customer Question

what pitch should a 25hp out board propeller have
Submitted: 7 months ago.
Category: General
Expert:  PaulB replied 7 months ago.

If your current propeller is at wide open throttle rpm within the specified rpm range for your engine, select a replacement with the same pitch.

If your current propeller isn't at wide open throttle rpm within the specified rpm range for your engine, select a replacement with a larger or smaller pitch using the following guide:

1. Adding 1 inch of pitch will reduce the wide open throttle rpm by 150 to 200.

2. Subtracting 1 inch of pitch will increase the wide open throttle rpm by 150 to 200.

3. If you are upgrading from a 3 blade to a 4 blade propeller, remember that a 4 blade propeller generally turns 50 to 100 rpm less than the 3 bladed equivalents.

The size of your propeller will either be stamped on the hub or on one of the blades (it varies by manufacturer). It will appear in the format of: 7 1/2 x 7. The first number (7 1/2) is the diameter and the second (7) is the pitch.

PaulB, Consultant
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