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Home Port: Suffolk County, NY
Vessel Info: 2001 38 Open; Cummins 6CTA8.3 450HPx2
Hi all,
2001 38 open, twin Cummins 450, ZF transmissions 1.719:1
What is the difference 3 vs 4 blade?
Ran a 4 blade boat: 2200RPM=22kts
2400rpm=24kts
WOT 2665rpm=27.5kts
How does that sound?
Thanks,
Andy
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Home Port: Kings Park, NY
Vessel Info: 2003 38' Open Cummin's 6CTA's (450 hp)
I have a 2003 38 Open w/450 Cummins as well but with 24x28 3 blade nibrals w/full cup.. At 2100 I'm doing 21.5knots. At 2200 23-23.5knots and wide open, 2600, I'm at 27-28 knots. Very similar to your analysis. Boat came with 3 blade but have heard several owners switching to 4 blade. Was told they are smoother, less vibration, although at all speeds mine feels smooth. Not sure what the real difference is. M2C
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Any body know the cost of four blade
Prop.
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Home Port: NORTHPOINT Marina, Winthrop Harbor IL
Vessel Info: 2006 Cummins QSC’s
About $7000 for the pair
2006 Tiara 3800 Open with Cummins 8.3 QSC's
