Pitch change if going from 3 blade to 4 blade

[footballfetch]

Have an Xpress bay boat - 175 SHO with PowerTech 21p. I want a four blade and want to go with the Bravo instead of the Trophy to stay with a bigger hub. Do I need to go down in pitch on the Bravo or can I stay with the 21? On my 150 I used a 21 pitch trophy to replace the 21 pitch powertech and it worked well. Any pointers would be great.

[PMantle]

Hard to say for sure, but generally speaking, if a Trophy works on a given set up, you need to go up one inch, and sometimes two, for the Bravo props.

[fish_finder1]

Try a 21 tempest on that boat.

[footballfetch]

Try a 21 tempest on that boat.

Heard that a lot - so that may be where I go. I want great holeshot but with a hydraulic jack plate guessing I can get it to yank out of the water with a 3 or 4 blade.

[Capt James]

A 4 blade is better on a jackplate boat and shallow water in general. I'd go with a 20" bravo XS. You can always have tip cup needed to make it a 21....... that's all Mercury Racing does on the odd number props is add tip cup from the even numbered props.

[footballfetch]

A 4 blade is better on a jackplate boat and shallow water in general. I'd go with a 20" bravo XS. You can always have tip cup needed to make it a 21....... that's all Mercury Racing does on the odd number props is add tip cup from the even numbered props.

Ok good to know.