Need some suggestions for Prop size

[yamhoss86]

Hi All,

Just installed a Mercruiser 5.0 MPI with an Alpha One (1.65).
The boat is a 21' Proline Walkaround (3500 lbs Hull Only).

What size prop should i go for?
I looking for economical performance.

Thanks in advance.

 

[Challenger84]

19-21pitch
To get a better answer the experts will need what you currently have..
What is the RPM at WOT.?
From there people an give you suggestions on what to get to "Maximize" your performance..

 

[yamhoss86]

19-21pitch
To get a better answer the experts will need what you currently have..
What is the RPM at WOT.?
From there people an give you suggestions on what to get to "Maximize" your performance..

Thanks for the feedback.
I haven't taken the boat out yet so I don't know my WOT. From my Mercruiser manual it's says the WOT is anywhere from 4600-4800.

 

[Challenger84]

Thanks for the feedback.
I haven't taken the boat out yet so I don't know my WOT. From my Mercruiser manual it's says the WOT is anywhere from 4600-4800.

That's the recommended RPM range for WOT..
What prop do you have on there now?

 

[yamhoss86]

That's the recommended RPM range for WOT..
What prop do you have on there now?

This is a new engine so i've never ran this engine in the boat.
Thinking about getting a 14.5x19.