37 Duffy. twins.. modified keel

Bill

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Saw this down at bay point marina in quincy today. figured you guys would appreciate it. Ronnie pointed out the keel, looks like it would help out in a following sea but have never ridden on it.

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Blitzen

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I would love to hear more about that boat. Power, speed and handling?
 

Keels Rock

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I think it defeats one purpose of a downeast to have all that exsposed running gear vs the traditional set up then to add a tower that thing must rock like a cholrox bottle, nice lookin rig from the water line up though!!:)
 

tunaorlater

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Yuk! Not for me. WL up looks sweet, to bad the resale is next to nothing.
 

tunaorlater

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Because a twin screw DE is a very hard sale. There have been some very nice twin screw boats that were for sale for a long time and sold for half of what they would have with a single screw.
 

HarborRd

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Fair enough, I suppose. But then, that's building a custom boat. You can build it so that other people would be more likely to want to buy it from you in 5-10 years, but you might be sacrificing something specific you want that might turn others off. Personally I love the sheer and profile of a DE design, but am all for modifying the bottom to gain some speed from it if at all possible. Yes, some of the advantages inherent in the design are perhaps lost in doing that, but compromises are made in the construction of custom boats every day.

Also that boat is a 42', with what appears to be a spray/lifting rail molded into the hull to convert the soft chine into a hard chine.
 

Raider Ronnie

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GoodChance

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Harbor - The purpose of that large keel/skeg under a rounded chine downeast boat is to 1) keep the boat from rolling and 2) keep the boat tracking straight.

Hard chined boats use the "hard chine" to keep the boat from rolling.

This "user modified" 35 Duffy (who apparently knows more about boat design than Spencer Lincoln) has neither a keel nor a hard chine. I would guess you could stick a loaf of bread up in the tower and shake the yeast out of it in a decent blow.


Fair enough, I suppose. But then, that's building a custom boat. You can build it so that other people would be more likely to want to buy it from you in 5-10 years, but you might be sacrificing something specific you want that might turn others off. Personally I love the sheer and profile of a DE design, but am all for modifying the bottom to gain some speed from it if at all possible. Yes, some of the advantages inherent in the design are perhaps lost in doing that, but compromises are made in the construction of custom boats every day.

Also that boat is a 42', with what appears to be a spray/lifting rail molded into the hull to convert the soft chine into a hard chine.
 
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fishinwishin

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Harbor - The purpose of that large keel/skeg under a rounded chine downeast boat is to 1) keep the boat from rolling and 2) keep the boat tracking straight.

Who told you that? So round chine boats that don't have a big keel roll and don't track strait?:rolleyes:
 

tunafishhkg

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I think I know that JC with twin volvo's and it also has a small 2-3cyl volvo thru the keel with a folding prop for trolling. Center engine not operational and he plans on taking it out but he say's the boat does not handle too bad with the twins LOL. Price was right for him at around 15K plus he mostly does inshore charters but have also seen him out at Georges BFT fishing a few times. You know what they say about whats available for for any seat.:cool:
 

Blitzen

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Well here is some info in the boat and the boat has sold twice before the current owner.
I have spent a lot of time on a 42 with a 800 hp. cat offshore fishing I would still like to know some first hand info on how it handles and compares.

Vessel Name:ZORAUSCG Doc. No.:1051948Vessel Service:RECREATIONALIMO Number:*Trade Indicator:Coastwise Unrestricted, Fishery, RecreationalCall Sign:*Hull Material:FRP (FIBERGLASS)Hull Number:ABH42068A797Ship Builder:ATLANTIC BOAT COMPANYYear Built:1997
Length (ft.):42Hailing Port:SCITUATE MAHull Depth (ft.):7.3Owner:JOSEPH J CAMPEDELLI
14 TAD LANE
COHASSET, MA 02025
Hull Breadth (ft.):14.5Gross Tonnage:29Net Tonnage:23Documentation Issuance Date:August 30, 2011Documentation Expiration Date:August 31, 2012Previous Vessel Names:SAWDUST
 

Twin Fins

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No more keel

No more keel


In the early days carolina boats had full keels.I worked on a 55' Billy Holton (Hit N Run)that had one.She was a hard chine, planning hull with twin engines. She would lay over like a champ in both following and stern quarter seas.The boat was just hard to handle.We took her to the yard popped a chalk line and cut it it off,leaving 6-8".The result was a huge improvement
in handling , very little in speed. This was found to be true on all boats here in which the keels were removed.None were ever put back on.
My question is this.What would happen to a soft chine DE boat if you removed the keel(blocked it out in the mold),leaving enough for blocking(6-8").Ran the shaft to a strut moving the wheel further aft and used hanging rudders(move way aft as well).This would decrease shaft angle,increase water flow to the wheel,allow the individual to determine wheel size.I operated a single screw with twin rudders and she handled great around the dock.Is there a negative from doing this to a DE used as a sport boat? Your opinion on the results if this was done.
 

El Mar

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HarborRd

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Harbor - The purpose of that large keel/skeg under a rounded chine downeast boat is to 1) keep the boat from rolling and 2) keep the boat tracking straight.

Hard chined boats use the "hard chine" to keep the boat from rolling.

This "user modified" 35 Duffy (who apparently knows more about boat design than Spencer Lincoln) has neither a keel nor a hard chine. I would guess you could stick a loaf of bread up in the tower and shake the yeast out of it in a decent blow.

A few years back Lincoln designed a 36' harpoon boat for a Maine harpooner to be built by Finestkind boatyard in Harpswell. The keel of that boat is drastically reduced from what a "normal" downeaster sports, and in that regard is somewhat similar to the Duffy in this thread, only the stick boat has a single screw, conventional shaft/strut for running gear, a fabricated piece of stainless acting as a "skeg" to protect the gear, and a small bit of a chine at the corner. That boat has, and you can see from the link, a bit of a tower on her. Granted, they usually only go sticking when it's damn near FAC out.

One-off construction of commercial tuna fishing boat
 
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El Mar

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BillD

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I've spoken with Tony Athens out at Seaboard Marine in CA. He has built out and powered a few Maine built DE hulls for commercial guys out on the west coast. I'm pretty sure a Wesmac and a Dixon.

In both boats he's modified the bottoms. Not sure to what extent but he uses BIG rudders installed back aft under the transoms.

He says the issue the commercial guys have on the west coast is a constant big following sea on the way back to port.

I'll try and get some further info.
 

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