WOTW2E

Here is a pair (left and right) of 15.25 x 31" Merc labbed bravo 1 props. The Merc part numbers are left hand 48-831917L45 with serial number YAISL and right hand 48-831918L45 with serial number TAISL. Like new. 20 minutes of test time. Shipped in cardboard prop boxes. No hubs included. $1161 retail plus the labor to add tip cup for each prop. Over $2700 retail to replace these props.

Notice the Merc numbers above are for 30” props. These were repitched to 31” and tip cup was added. Lab work was done by Mercury Racing.

$1600 OBO for the pair plus shipping.
Adam

indywhsle

Will you trade for a set of 28p bravo's labbed?

WOTW2E

Evening Mike. Don't have a need for 28s at this time. If you sell yours let me know, maybe we can make a deal on these 31s. Thanks
Adam

WOTW2E

I have had a lot of questions on the 30” and 31” labbed props that I had/have up here for sale in the swap section asking about set up, design and such. I am no prop expert by any means, but here is what I THINK I know. If anything here is not right, maybe a prop guy will chime in.

These props are a universal (for lack of a better term) lab finished prop that can be ordered from Merc under a Merc part number right out of a Merc catalog. It is my understanding that this universal lab finishing thins the blades, blueprints, balances, etc to gain 200 rpm over a standard prop.

So in theory if a standard 30" B1 turns 5000 rpm, then one of Merc's 30" B1 universal labbed props is designed to turn 5200 rpm.

Said in another way that makes more sense for those of us that want to go faster, if you have a standard 28" B1 turning the correct rpm for a given propulsion package, call it 5600 rpm, you could use one of these universal labbed props in a 30" and still have that same optimal 5600 rpm yet the boat would be faster through the water due to the extra pitch.

These particular props are a universal labbed 31” pitch. Again, these can be ordered from Merc using a Merc part number directly out of a Merc catalog. The Merc prop shop takes a standard 30” prop and thins the blades, blueprints, balances, etc and adds 1” of pitch.

Using the previous example, say 5600 is a bit over what you want to safely spin your propulsion package, 5500 is optimal. You could swap the standard 28” B1 for one of these universal labbed 31” B1 and be at 5500 rpm.

These particular 31” labbed props also have tip cup added. The tip cup helps the prop bite harder generally reducing slip. The tip cup is supposed to help carry the nose of the boat higher. I have never been able to try a set back to back (tip cup vs non tip cup) to report if there is a significant difference. I can tell you that these 31” were only tried on one boat for about 20min of test time. It was a twin step 36’ v-bottom boat with 525s on 20” centers. The dual water Bravo XR prop shafts were 2.5” below the bottom. I did not expect to be able to get on plane with 4-blades. As it turned out, they popped right up on plane and ran 87 and some change hard on the rev limiter at less than full throttle. The slip was too high on the big end. 30” 5 blades worked best for this particular setup.

Hope this long winded post helps. I would like to sell these things.
Adam

SCORPION 31FT

Will You Trade For Some 31 Hyro 4 Blades
Call Me 269-998-5914

WOTW2E

Thanks for the interest but I have never had any luck with the hydo stuff.

I am pretty sure they are sold. I have a back up buyer for the first buyer as well. I'll update this thread as soon as I have something positive.
Thanks
Adam

CheckedOut

Still for sale? I am a serious buyer. Email [email protected] with pics (as they are no longer on the page).

CheckedOut

BTW, Those are the merc part numbers for the labbed 31P and not the 30s. That is how i found your ad.....