Prop Choices
 

Ok, I know its not a Pantera but its pretty similar. We have a 27 Avanti with a custom built 525 in it (496 Cube, Accel DFI etc). It has a pretty good hook,strakes that suck the hull to the water and has no bowlift. Before we make our changes to the hull, we figured we would play with props for a little bit. We are running a 28 B1 now an are getting about 5000 out of it a 65 mph. We need to turn about 54-5500. We tried a 25 maximus but it wasnt much better.What prop do you guys run on your 28s?
Thanks, Johnny

Try a 26B1 - If that doesnt work too well, try getting a spacer and dropping the drive . Your prop slip is about 25% , and should be around 12-14 .
With the X dimension too high , you wont be able to carry the bow .

do you know the X . Do you know how far the prop shaft is below the keel ? Measure it and let us know .

Jerry

Try a 26B1 and a 27 Mir+.
see how the rpms and the boat reacts.

and if jerry's slip calc is correct, that is quite high.

Sounds like my boat. Griff put in a 3" spacer and it runs a touched up 26P B1. Runs good and pulls up to about 5300.

It has a 1" spacer and is in the water quite a bit. We just want to get a couple more MPH out of her before we make some serious changes.

Also, it has a notched transom, and came from the the factory with a 2" spacer. I switched to the 3" spacer and the propshaft is 4.25-4.5 inches below the bottom.

I am familiar with the 27 Avanti. You need to take the hook out, period.

Hooks out. Still only spinning the 26 4650 at 67MPH.
We have a bigger motor going in soon though.

It makes no sense that you could spin the 28 at 5000 and now only spin the 26 at 4650. Have you tried any Mirage Props? They typically work well on the 7' beam boats if your drive height will allow it.

Sounds like the hook in the bottom had a lot to do with it. The hook will push the bow down and potentially lift the rear which can cause the prop to slip more.

Does the bow seem to carry better now? You're now at about a 12% slip which is pretty good especially with a bravo. I would try a Mirage too, just to see if there's a difference. Maybe try to find a regular ol' 25 Mirage and see what it does.

jeff, you still runnin the 23+?

Been running the 24" Hydromotive. Been doing more cruising than hauling a$$, which this prop is better for.

I also have a 25" Mirage that I've been wanting to try. ;) I think once it cools down a bit I'm gonna find the 25" is the right prop for speed. :cool-smiley-027:

remember to keep the rpms in the upper 5s.
i bet a labbed 25mir+ would be tits.
come on! i wanna see that package run 80+. always thought it could.

The 5000 is a missprint. It was always around 4500. I was wrong.

It runs at a much better attitude with less trim.

If you can try the Bravo126 and a Mirage+25 and a Plain Mirage25 on the same day, You will probably find the plain M to be faster like Ziemer said if it will get on plane.

Thank You

Any updates?

Hey guys ,poped a blade on my 26 labbbed. Has anyone tryied a high 5 on a 24? The 26 had 3/4 cut out dia. x dim. 17.5 was running 82 @5400. Have not tryed any 3 blades. Need some info RICHIE.

No high 5, not enough blade area, T-Mone runs a P5-X though.
http://www.offshoreonly.com/forums/s...=131995&page=5

I tried one and Pat is absolutely correct, not enough diameter and a lot of slippage. Also too much stern lift and no speed.

Hit 68.4 Saturday. Light 2 foot chop, 55*,1/2 load fuel.
It actually runs faster with more weight in the boat. More prop in the water?

55*????:D

It was a bit chilly.:D

I meant it helps. That cold air should add a mph or 2.
Just wait for the water to chill abit. better prop bite in denser water.

I think we are just going to finish off the season and maybe start the next one with the 26B1. We have a much bigger motor going in for next season so right now, it runs fine.:D:cool: