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-   -   Propping a B3 (https://www.offshoreonly.com/forums/prop-talk/341993-propping-b3.html)

Pol83x 12-20-2016 06:53 PM


Originally Posted by Knot 4 Me (Post 4511397)
My '04 Chap 260 SSi with 496 MAG/Bravo III 2.0:1, 26" 3 x 3 prop set ran a best of just shy of 54 MPH GPS. Most days it was a 50 - 52 MPH boat. I don't see your boat doing 60 MPH but 58 should be doable. Update us in the spring. BTW, from my own personal experience Chap hulls do not like the 4 x 3 prop sets at WOT. Cruise they are great but they lift the stern too much on the big end and feel skittish.

I had a 02 265 ssi with that setup, could hit 54.8 on its best day. I'm hoping for 58 on my 230ssi.

Knot 4 Me 12-21-2016 07:02 AM

3 Attachment(s)

Originally Posted by Sonic30ss (Post 4511452)
Mercury created the 4x3 in the early 2000's as a fix for cavitation burn when mounting B3's to high HP applications.

Brett

So this is why I'm cracking and blowing out pieces of rear props within 30 hrs?......
22,000 lbs 640hp @ 5200/ 690ftlbs @ 4100 2:1 drives 28 p....maybe a candidate for the 4x3??[/QUOTE]These came out around '05 to address your issues.

Pol83x 12-21-2016 12:37 PM

I talked to merc racing on those xr props. They told me they are intended for use on large cruisers and would be no good for smaller runabouts and sport boats.

AllDodge 12-21-2016 02:14 PM

Have to agree, your boat doesn't weight enough for a 4 blade, your slip right now is only 7.7% and that's good, I'd love to have that little slip.

Knot 4 Me 12-23-2016 07:22 AM


Originally Posted by Pol83x (Post 4511701)
I talked to merc racing on those xr props. They told me they are intended for use on large cruisers and would be no good for smaller runabouts and sport boats.

They are superior to my stock (well, slightly BBlades modified) 3 x 3 set in terms of hole shot and cruise efficiency. I picked up 2 MPH at my normal cruise RPM (3,400) over the 3 x 3's. On the big end I obviously cannot pull as many RPM (26" 3x3's vs. 25" XR's) and I cannot carry the bow as well as I can with the 3 x 3's. Overall, for most of the boating I do the XR's are my preferred propset.

liquidlounge 12-28-2016 03:36 PM

Is there any functional difference between the XR's and the standard 4 x 3 prop set? ....other than polish of course.

Pol83x 12-28-2016 04:21 PM

The XR props have a lot more cup Merc told me. They said would be a waste on my boat.

liquidlounge 12-28-2016 05:11 PM

My interest in the B3 has been rekindled since I swapped one on from my other boat just to see how I liked it. Truthfully, I think I like it 95% of the time over the B1. With the B3, it planes quicker with minimal bow rise, higher cruise speed/rpms, way less load sensitive, better low speed handling, noticeable fuel efficiency improvement AND ODDLY ENOUGH, a better ride in heavy chop. The only downside from my B1/B1 prop setup has been looser and less confident handling at higher speeds. The B1 really hooks up the back end on my boat , but carries the bow slightly less and really has confident handling.The B3 seems to lift the transom (my theory for the softer ride) AND carry the bow higher even with little trim. I don't really notice any difference in top speed as I only have a stock 502 Mag, so my top speed was only mid 60's anyway where the B3 starts hitting the wall. If possible, I would like to find a B3 combo that lifts the transom SLIGHTLY less and carries the bow SLIGHTLY less. Would any of the 4 x 3 sets offer this?

liquidlounge 12-28-2016 05:32 PM

My interest in the B3 has been rekindled since I swapped one on from my other boat just to see how I liked it. Truthfully, I think I like it 95% of the time over the B1. With the B3 (3 X 3), it planes quicker with minimal bow rise, higher cruise speed/rpms, way less load sensitive, better low speed handling, noticeable fuel efficiency improvement AND ODDLY ENOUGH, a better ride in heavy chop. The only downside going from my B1/B1 prop setup to the B3 has been looser and less confident handling at higher speeds. The B1 really hooks up the back end on my boat , but carries the bow slightly less and has really confident handling.The B3 seems to lift the transom (my theory for the softer ride) AND carry the bow higher even with little trim...again, loosey- goosey handling at 50+. I don't really notice any difference in top speed as I only have a stock 502 Mag, so my top speed was only mid 60's anyway where the B3 starts hitting the wall. If possible, I would like to find a B3 combo that lifts the transom SLIGHTLY less and carries the bow SLIGHTLY less. Would any of the 4 x 3 sets offer this?

liquidlounge 12-28-2016 05:41 PM

disregard post #18. Its not allowing me to delete for some reason.


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