89' Larson Lazer w/ 5.0l merc

[ajsumms]

So I upgraded to this boat and will was wondering what prop I could use. It has a 3-blade 19p prop right now. It has plenty of power with the 5.0 and I was wondering how high I can go on the pitch or if I should go with a 4-blade.

 

[buckinrut25]

To give any good advise we will need engine RPM at WOT and GPS speed. Without that information your just guessing. Other helpful info, model of boat, year of the engine and gear ratio.

 

[jestor68]

What pitch is best depends on your intended use. For example, a higher pitch "speed" prop is not very good for water sports.

Higher pitch yields more top speed at the expense of acceleration(pulling power).

I believe your WOT rpm range is 4200-4600.

A test run is required to see where you fall in your rpm range.