AIR TIME

A 28 4 BLADE YOU WILL SEE 3600RPMS YOU NEED A 25REV 4 THE 26 IS TO BIG FOR YOUR MOTOR IF ITS ONLY HITTING 4000rpm

pashn8boater

During the break-in time I only ran it up to 4000rpm a couple of times. The motor had a lot more rpm left to go. Just couldn't keep the prop from cavitating.

I was wondering if the 4 blade is lifting the back end of the boat? In comparison to the 3-blade?

kennyo

Those hulls need bow lift. That is where the 4 blade comes in. I think you need a bigger pitch, around a 27 or 28. If you're really putting out that much power you'll be closer to a 30p.

socalstone

Yes, they need tons of bow lift. Adding blades will lift the stern. I haven't tried any 3 blade props yet but would like to. I'd bet you could spin a non-labbed 30 right out of the box. If not, some mild tweaking would probably get you there.

AIR TIME

when I had 580hp I could only spin a 28 to 4800, when we put the 650hp motor in with stock drive height we were getting 5200 with a 26 b1 with the 2''shortie and carb change making 670hp we are at 6000rpm with a 26 b1 83,2gps going to a 28 lab. when the boat is back together. you could try a 27mirage plus through BBLADDES PROP PROGRAM its like 20 bucks to try aeach prop the b1 WORKS BETTER WITH A HIGHER DRIVE HEIGHT, THE MIRAGE OR THE REV 4 WORKS BETTER WITH STOCK HEIGHT. I have tryed most of them over the last 18yrs I started witha 330hp, then a 93 502 390hp, 580hp, 595 hp, 509 650 hp, 670 hp. so I hope this helps oh when you said 4000 rpm I thought that was your max. if your slipping at 4000 it could be to much trim. good luck and check with BBLADDES.

AIR TIME

HAS ANYONE PUT A EX BOX ON A 24?? i THINK i AM THE ONLY ONE TO TRY A 2'' SHORTIE AND IT WORKED GREAT.but now that it was stolen I am thinking about a ex box with the bult in 3'' lift and no shortie, put artic put one on a 27baja and hated it. so I may just go with a new shortie again.

pashn8boater

Hey Air Time,
The best run was with the motor barely trimmed out. I mean a quick touch to the trim button. I was thinking a 3-blade 27 or 29. Will let you know how it works out.
Thanks for the input. Calling BBlades today.

kennyo

I'm using a Stern Jack. Same principle I think with less work. It was worth 3 mph before the procharger. ( Right Shoe?)

Wild Card 09

Guess I just have to add something, here. As you know, I´m totally convinced about the improvements in handling and speed that the 3" lift box have added to my 25OL. However, I was beginning to believe that the 4 1/2" prop to pad dimension that I am running was as high as I should want to go.
Then a buddy of mine with a similarly configured, but longer boat (29 Aerotek - pad bottom, notched transom), who had already fitted a 3" lift box after seeing the success on mine, decided to raise his drive even further. He has gone up from a similar 5" dimension up another 2"!
With only 3" prop to pad, his boat runs even faster, and he says the handling is even better. He runs a TPM 900 motor and is still pulling hard at over 90 mph (also using a labbed 28" Bravo, but on a 1.36 Imco SC drive)
What I´m saying is that two different boat/motor settups really responded well to the Imco box.
I can imagine the 24OL would work good too.

wantingmore

You may want to get with Don Carter at Offshore Performance Specialties here in south Ft Myers about prop selection. He's great to work with. Where do you do your boating here? We're usually hangin' out at the Lani Kai.