Then the final factor is choosing the "correct" prop for THAT boat it's powering.
Two identical boats may be rigged or loaded with weight differently requiring two different props given identical motors ...
Then you still have to play with motor mounting height or running height (jack plate) to tune this tool ... Prop.
It kills me to hear of someone purchasing a boat and them trying only one prop and then blaming brand "x" outboard as being poor performing or inefficient.
I literally played with 5 different props for my boat. Notice I said boat not motor.
It's worth it's weight in gold to have a good relationship with your local prop shop.
I have 3 props I kept and each behave very noticeably different ...
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