how to choose prop pitch&number of blades
 

I have a 1984 30'scarab blown454's aproximate horsepower 600 trs drives .If i run a four blade prop what pitch should i use keeping the rpm's 5500 to 6000 looking for top end speed?

Re: how to choose prop pitch&number of blades
 

What is the wet weight of the boat?

This includes fuel, people, gear, food, beer, ice, etc., etc.

What is your gear ratio?

Re: how to choose prop pitch&number of blades
 

The drive ratio is 1.5 to 1 ,the weight i'm not sure but i guess 7800 8000lbs ?

Re: how to choose prop pitch&number of blades
 

Start with a 24 or 26 Bravo 1 or 23 through 25 Hydromotive. The 23 or 24 should put you in the top end of your rpm range while the 25 or 26 should put you toward the bottom end of your rpm range.

Matt

Re: how to choose prop pitch&number of blades
 

26-28 Bravo 1 depending on how accurate your weight is.

I figured you to run the engines in the 56-5700 rpm range in the mid 80's