Sydwayz

iTrader: (1)

I lost a blade on the LH 28P B1 on my boat this weekend. Damaged the lower casing as well when it came off. Case in the process of being replaced as we speak, including full checkout of the lower, gears, and bearings.

I was running 28P B1 4 blades bone stock.
37' Active Thunder
Single step
496HOs (425 HP)
Bravo 1 XZ 1.50 drives
Spinning about 4800 rpms when light on fuel and friends, occasionally make it to 5000 rpms trimming out with right conditions
Approximately 9800 lbs dry (with stereo and 4 batteries)
180 gallons of fuel, so
10600 lbs or so with half tanks a couple folks, and gear
I pulled 74 mph gps with a little chop this past weekend with above setup at about 4800 rpm.

Best I have EVER seen the boat do is 77.5 mph gps. That's in 3 foot perfect rollers in salt water.
Smooth water will get it to about 71 mph or so.

I now have excuse and reason to do some prop tweaking. I am looking for a pair of 28 B1 props, or a LH 28 B1 prop to replace the one that broke. I would like to have them matched and labbed/perfected, BUT NOT THINNED OR TOO SHARP, as I boat in the Potomac River which has a section of falls up north in the mountains which creates a LOT of river derbris. I don't want fragile props.

I would like to get the boat to see 80 mph legitimately when I get that perfect water again, just once, but propping the boat to see 80 mph is NOT my main concern.

What is my best option/choice?

28P B1 4 blades bone stock? (Was I at my best prop choice already?)
28P B1 4 blades trued up matched with a blueprint but not thinned?
30P B1 4 blades trued up matched with a blueprint but not thinned? (3 other same local boats with 500+ HP each side are all running best with 32P B1 4 blades or close to that, would 30P be too tall for my boat?)



Pat, do you remember if you ever tried 30P on Monsoon?
Just how scary is turning the props in on a 37AVH, out of curiousity?

docmanrich37

The PX5 won't work on the A/T.I'd like to try one but i'm not paying for it unless it works.

Sydwayz

iTrader: (1)

Second 37AT owner to tell me that. I am going to try Craig's props this weekend, probably bring them to Lake Anna on Friday or Saturday. My lower unit internals swap is done, and I should be water ready by Thursday. Gotta appreciate good friends.

offshoredrillin

I was going to try the p5's on my tiger, otis said it made his bow plow down. after talking with Brett a bblades I've decided to stay with my bravo 1's and lab them. they seem to work best on the long straight hulls, but you guys have steps, from what I was told round tips give stern lift, cleavers raise bow.

CheckmateF1

I learned it was the other way around. Round blades(Bravo 1) provide bow lift. Cleaver style blades provide stern lift.

OldSchool

Well???? How did it go?

Sydwayz

iTrader: (1)

Dead on the right RPM Craig, but I lost 2-3 mph. I will be pulling them off and getting them back to you soonest. Thank you very, very much.

ATPatrick

What were they?

Sydwayz

iTrader: (1)

27P Bravo1 Labbed ran 68 - 69 mph on flat water.
Going to try and find some labbed 30P Bravo1s.

ATPatrick

Based on what I saw at the top of this thread, if I were going to play with props I would lab the 28 stocks at Mercury Hi-performance.

And please don't change the rotation. You won't like the results.