Prop adjustment info needed

[Marauder]

29' center console
Running 70-1/2 mph on GPS
5000 - 5100 rpm
28 pitch Bravo 1
with ventilated hub
Twin Mercury 250 EFIs

Redline is 5800 on those motors, can I repitch to 26 pitch?

Isn't my slip-age rather high? Is there a better all around prop?

Thanks!

[shep70057]

You can, but it's always better to pitch up than down. Some prop docs will do 1" and others will do 2".

[Marauder]

Theoretically, 2 degree would add how many rpm? mph?

[Astro]

from what i have found out recently, you can expect to loose 150-200 rpm for every inch of pitch that you increase. But.......I have seen first hand that different types of props act differently. On my fish/ski boat I went from stock 22p quicksilver to bravo1 25p cleavor and gained 300rpm:eek: , then went to 4-blade trophy plus 23p and lost 150 from stock but gained 3mph and better fuel mileage.:D I have learned from some of the gurus here like T-REX, Pyro, The BIG AL, and others your boat setup has a lot to do with how your engine performes with any certian prop. Can you tell us about engine height, boat weight, weight dist., etc?

[leading edge propeller]

29' center console
Running 70-1/2 mph on GPS
5000 - 5100 rpm
28 pitch Bravo 1
with ventilated hub
Twin Mercury 250 EFIs

Redline is 5800 on those motors, can I repitch to 26 pitch?

Isn't my slip-age rather high? Is there a better all around prop?

Thanks!The first thing to look at is getting the motor rpm higher. 5000-5100 at that rpm you are lugging the motors, not good. It's hard to beat the performance of the bravo 1 prop's. I would pitch them to 26 that will gain you about 400 rpm and should increase all around performance. Hope this help's. Rich

[Astro]

get jackplates for the motors, raising them up will let them spin faster.