I`m using a 25-14,5 Mirage + On my 25 Arriva with
502 MPI and hitting the rev limmiter 5000.
Now want to try a 4 blade Bravo prop, what is the
best to try a 24`or 25`? Thanks.

502 Magnum

Bravo 4-blade's come stock in even sizes(22, 24, 26, etc.) and the general rule of thumb when converting from 3-blades to 4-blades is to go down 1" in pitch. This would indicate a 24, but since you're on the limiter, you may very well do better with a labbed 26.

I think the 4 blade Bravos are in even # pitches. You will have to go to maybe a 28 inch and work it from there. I bet a 26inch will make you experience the same problem. Your boat will lose some top end, but will cruise better and hole shot better and you might experience some additional stern lift. You may want to have some cup added to your Mirage.

Am I thinking backwards with the 4 blade pitch increase, Baja Daze?

You`r right Baja Daze,24 or 26,in the end of the seasen i
hope to get my HP 500 EFI ready,and I think a 26 must be
good,just wondering if my orig 502 Mag Efi,415 Hp can
make it,Whiteknuckle! I want to try the 4 blade Bravo,
they says it sticks when you turns and good on starting,
thanks guys

502 Magnu Bjorn

Rules of thumb:

1. You will lose 100 to 200 rpm going from a 3 blade to a 4 blade prop.

2. You will lose 100 to 200 rpm when you go up in pitch.

I went from a 21" mirage plus to a 22" bravo 1 and lost 300 rpm. But, the bravo 1 was a demo prop covered in chipped blue paint. I'm told the pitch on bravo 1's is overstated by 1/2 inch.

I'd try to borrow a 24 pitch bravo 1 to test. If you can't make 5000 rpm you can have it labbed to regain the rpm. If you're still hitting the limiter with the 24 pitch, buy a 26 pitch.

I stand corrected on my RPM Change between a 3 blade and 4 blade. You guys are correct.

I know you`r right here Guys,you are putting me on the right track,I must work out from a 24`,thanks for help and innput.

502 Magnum Bjorn

Actually bravo props are measured conservitively so you would go up a pitch from a mirage

There is a couple Bravo1 props on the classified section. If not the right one, I have a 26 I don't need. I'm looking for a 29 or 30 three blade myself.

Frequency;

Actually the Bravo1 props are 1 1/2" less than their stated pitch. They are measured and sold at their maximum pitch where most other props are measured and sold at their average pitch.