davis777

Hey guys,
I know there are so many variables in propping and individual results, but if you could say "in general"-

I am running a Mirage Plus 23 with a 496 Mag/Bravo 1 and i am at 62MPH top end speed.
Would I see any top end increases with a Bravo 1 22 Pitch???
I went to Mercs site and did the prop selector and it gave me a Bravo 1 22 pitch.
I have only run a Mirage Plus on my boat- i just would like some input before I spend $500.00
Any Info, tips, advice would be appreciated- Thanks Guys.

throttleup

I will need a little information to assist you.

With the 23P Mirage Plus what is your:

WOT RPM?
WOT MPH via GPS?
Gear Ratio?

Julie

davis777

I have a 496 Mag standard version-375hp
Bravo 1 --1.5:1 gears
61 MPH Mirage Plus 23
4870 WOT

davis777

Hey Throttle UP-
I know GPS is of course more accurate, but in general with a water pick up teleflex speedo if the speed says 62 would i be traveling slower or faster than that actually with GPS verification?

throttleup

I have calculated 14% for your slip if your speedo is dead on! You are running right were you should for the 496 at the 4870 RPM at WOT. I would say that speedo are pretty notorious for being inaccurate. They typically read a greater speed than you are actually going...sorry guys!
So in order to run accurate slip numbers we need a GPS reading. Keep us posted.

Julie

davis777

So in that case- Would you reccomend a Bravo 1 22 or stay with the Mirage 23??

bbladesprops

I'm sorry, what kind of hull do you own?

Years ago before gps we would subtract 5mph off pitot speedometer readings before calculating efficiantcy. If you are actually running slower than stated, your slip will be higher than the current 14%. This means you may benifit on top end from a 4 blade propeller. Hull design matters too.