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05-09-2013, 11:50 AM
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#1
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Senior Member
City: Circleville, Ohio
Vessel Name: Sunset Lady
Vessel Model: 1975 Chris Craft 35 Aft Cabin
Join Date: Jun 2011
Posts: 276
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Twin prop protection.
Given - a single prop has a lot of protection provided by the keel. Does anyone know about retro-fitting some skegs or something to help protect twin props and rudders?
__________________
Bilgewater
"Keep putting off till tomorrow, and you'll end up with a lot of empty yesterdays" Prof. Harold Hill
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05-09-2013, 01:31 PM
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#2
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Guru
City: Everett Wa
Vessel Name: Eagle
Vessel Model: Roughwater 58 pilot house
Join Date: Oct 2007
Posts: 2,919
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Quote:
Originally Posted by Bilgewater
Given - a single prop has a lot of protection provided by the keel. Does anyone know about retro-fitting some skegs or something to help protect twin props and rudders?
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I have seen it done. Angie, a old PMM member that blogs/emails monthly has twin keels/skags, so they can set the boat on the hard. They are presenlty in Mexico. We used their boat a a trawler Fest as a meting place one year. Its a long range custom boat.
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05-09-2013, 01:33 PM
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#3
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,786
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Actually on some trawlers the twin props are reasonably well protected, maybe as good as a single.
The twin's props are higher than the single's and often the bottom edge of the prop is above the low point of the keel. And the rudders are at or below the bottom edge which gives some limited protection.
David
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05-09-2013, 05:00 PM
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#4
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Senior Member
City: Palmetto Bay
Vessel Name: Sunshine
Vessel Model: Island Pilot DSe 12m Hybrid
Join Date: Apr 2013
Posts: 268
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Quote:
Originally Posted by Bilgewater
Given - a single prop has a lot of protection provided by the keel. Does anyone know about retro-fitting some skegs or something to help protect twin props and rudders?
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One could fabricate a metal skeg (or FRP or even plywood) for a retrofit. If it's just to keep flotsam from damaging running gear it could be lighter than if loaf bearing for beaching or support if the tide runs out.
On our twin diesel Florida Bay Coasters the skegs were beefy enough to support the hull when dry docked. Ali's, the more recent Great Harbour trawlers in FRP.
__________________
Reuben Trane
"Sunshine" - Island Pilot DSe 12m
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05-09-2013, 05:55 PM
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#5
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TF Site Team
City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,728
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We had a previous discussion of it with Tad Roberts here within the SINGLE VS. TWIN mega-thread. I have long been a fan of the concept and would love to be able to modify my boat with twin protective skegs. But the modification cost would probably exceed the benefit of avoiding an occasionally tweeked prop.
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05-09-2013, 06:21 PM
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#6
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Scraping Paint
City: -
Join Date: Oct 2007
Posts: 13,745
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Some boats, specifically the Great Harbors, were designed and are built with twin engines and skeg protection in front of each prop. There may be other examples out there, too.
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05-09-2013, 06:54 PM
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#7
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Guru
City: Vallejo, California
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 2,093
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Quote:
Originally Posted by djmarchand
Actually on some trawlers the twin props are reasonably well protected, maybe as good as a single.
The twin's props are higher than the single's and often the bottom edge of the prop is above the low point of the keel. And the rudders are at or below the bottom edge which gives some limited protection.
David
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Our GB42, like many boats, has decent protection for the rudders and props as long as what is hit is flat and horizontal!
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
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05-09-2013, 07:06 PM
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#8
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TF Site Team
City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,728
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Here's a shot from one of my prop repair haul outs. Arrrrgh!!
Much less prop protection than Ray's boat above.
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05-10-2013, 08:24 AM
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#9
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Guru
City: Cruising East Coast US
Vessel Name: Grace
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 2,420
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__________________
Cruiser
Esse Quam Videri
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