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3000 Offshore - Props

Anything related to the operation of your boat that doesn't fit another forum category. Steering, Bilge Pumps, thru-hulls, bottom paint, etc.
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fabalc
Junior Member
Posts: 13
Joined: Fri May 25, 2012 5:21 am

3000 Offshore - Props

Postby fabalc » Tue Sep 11, 2012 11:04 am

Does anyone have a 3000 Offshore with 20" diameter Props? I'm looking to go from 19" to 20" and wondering if the clearance will allow the increase in size.
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MarkT
Senior Member
Posts: 585
Joined: Tue Apr 05, 2011 10:42 pm
Home Port: Mattituck, Long Island
Vessel Info: 1999 Pursuit 3000 Express, twin Cummins 4-BTAs
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3000 Offshore - Props

Postby MarkT » Tue Sep 11, 2012 8:13 pm

If you can keep about 2 inches clearance you will be fine. I have worked on boats with 1.5 inches and there was no problem. What do you have now between the blade tip and the hull? You are only talking about a half inch increase per radius.
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Topic author
fabalc
Junior Member
Posts: 13
Joined: Fri May 25, 2012 5:21 am

3000 Offshore - Props

Postby fabalc » Tue Sep 11, 2012 10:13 pm

I have 19" Blades. The boat is comming out of the water soon. I wiil measure the clearence and report. I was told 15% clearance is optimal with 10% being ok.
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Trpntj
Member
Posts: 78
Joined: Tue Feb 22, 2011 5:59 am

3000 Offshore - Props

Postby Trpntj » Wed Sep 26, 2012 4:50 am

21x22.5 3 blades. I believe the ideal clearance is not the same with tunnels/pockets. Clearance is to eliminate the hull flexing as the blades swing by and create a area of low pressure against a standard hull, creates a vibration as the hull flexes. With tunnels you have the strength of the arch and it does not flex like a standard v-bottom boat would.

I would however like to test some different props. Pursuit's performance reports with the 330 cummins uses 19x26 #7 cup props and cruises the same but is 5 kts faster on the top. An additional 5 kts would be smoking fast.
2003 2870 CC, 200 HPDI\'s (Sold)
1996 3000 Offshore, Cummins 330\'s
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