Great info from BBlades.

If you're set up is close, your prop is the last thing to do. As one who knows from trying.........., a cheap prop ain't the same as a good prop. I have a bad habit of buying cheap used ones off e-bay too that may or may not be straight. I've written off a ton of them based on that that may have been crap examples to start with??

As another example of good Vs bad..... I have a friend running Cleavers on a twin O/B cat. He bought a set of (I think 15 x 34's) Ron Hills. He exchanged them w/him once or twice but still wasn't getting what he expected.
One issue was a 2 - 300 RPM variable between motors.
I was with him when he took them to a local, reputable prop shop. They put them on a digital pitch gauge and showed us a difference of TWO inches of pitch between blades!
I asked the prop guy if these props were coming from China and being re-labeld. He said yes.

Some times you get what you pay for.

I also have some experience w/labbing and agree w/Brent 100%.
I bought a set of e-bay Bravo 1's for my Sonic and was very disappointed in how they ran. Being cheap props means I'm willing to cut,grind, experiment w/them.
I made two mod's and drastically improved the charicteristics that I was after. That showed me they had promise.
My plan was to send them to Brent to be done right but have since put the boat up for sale.

In my experience, "labbing" is a general term. It is what ever you and your prop guy decide. Your guy should ask you if you're going through sand or is this your WFO only prop.

Bottom line? Back in my O/B racing days we had a prop guy that was called "The Prop God". There was a reason and he earned it!

you can also have your prop re-pitched without ''labbing'' it.

Yea I think I understand that thinning of the blades isn't necessary. So it looks like a 26p re pitched to a 25p with some cup added is a very possible scenario. Cupping adds bow lift correct? And from my understanding everything that would be done like re pitch, adding cup wouldn't thin the blades to make them fragile, so the durability of the prop should be the same as out of the box. Am I understanding this correctly.

I'll throw some slip numbers of mine out there. I run a 2011 checkmate ZT244 8.2mag 385hp with a bravo 1 X raised outdrive. Stock prop was a 26 pitch bravo 1, I spun it to 4600 rpm at 69mph 9% slip. I tried a 23 pitch rev 4 which I spun to 4900 rpm at 68mph, 4% slip. Then I tried a 26 pitch bravo 1 that had some lab work done to it. weather was cold and I was light on fuel. I was able to spin it to 4800rpm at 72mph, 9% slip. I'm getting a stage 2 PCM upgrade from whipple which adds 85hp. My question is will a 25 pitch rev 4 give me that low of slip number like the 23 pitch?

Quick question about slip

I have a Bravo III used the slip calculator and I'm less than 5%. Is there some correction factor because of the two props that I should consider?

please and thank you


3pointstar

Your slip is prob that low..... That duo set-up is very efficient . Just not good for top speed