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Boat propellers
, 02 13th, 2009
Boat propellers come in different sizes. There will be some numbers stamped around the prop shaft hole (on the propeller) on the end where the prop nut goes on.
They also might be stamped in between the blades on the barrel part of the propeller.
These will be a part number and/or the actual size number. Either way we can determine what you have and go from there.
There are always two size numbers for any boat propeller.
The first number is the diameter (measured from the prop shaft hole out to one blade tip times two).
The second number is the pitch (how far a propeller should travel forward through a solid one revolution in terms of inches).
The pitch is the most important number because different pitches will make the engine R.P.M.’s change at full speed.
The theory is for every one inch in pitch the RPM’s will change 150 to 200. The higher the number pitch means lower R.P.M.’s, and the lower the number pitch means higher RPM’s.
So the quest is to get the right pitched prop that will get you in your recommended W.O.T. R.P.M. operating range.
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