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11-03-2016, 17:16
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#1
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Registered User
Join Date: Feb 2016
Boat: 66' Spencer 42' Sloop
Posts: 399
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Twin v. Single Keels
Can anyone explain to me the pro's and con's of having twin keels over a single?
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11-03-2016, 17:22
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#2
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 9,626
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Re: Twin v. Single Keels
Bilge keels allow a boat to dry out and not fall over, but they introduce more drag when sailing.
Sent from my iPhone using Cruisers Sailing Forum
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11-03-2016, 17:42
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#3
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Registered User
Join Date: Nov 2011
Location: Portugal/Med
Boat: Comet 41s
Posts: 6,140
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Re: Twin v. Single Keels
Here you have some information:
Bray Yacht Design and Research Ltd. - The Advantages of Twin Keels
A modern twin keel can offer very good performance allowing a smaller draft. It is not as good regarding absolute sail performance as a deeper bulbed or torpedo keel but is the more efficient solution regarding performance if you need a smaller draft with the exception of a modern swing keel (with all the ballast on the keel).
But with a swing keel up you cannot sail, only motor, it is more expensive and has more maintenance.
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11-03-2016, 17:46
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#4
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Registered User
Join Date: Feb 2016
Boat: 66' Spencer 42' Sloop
Posts: 399
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Re: Twin v. Single Keels
Quote:
Originally Posted by Polux
Here you have some information:
Bray Yacht Design and Research Ltd. - The Advantages of Twin Keels
A modern twin keel can offer very good performance allowing a smaller draft. It is not as good regarding absolute sail performance as a deeper bulbed or torpedo keel but is the more efficient solution regarding performance if you need a smaller draft with the exception of a modern swing keel (with all the ballast on the keel).
But with a swing keel up you cannot sail, only motor, it is more expensive and has more maintenance.
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That boat is just frikin cool.
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11-03-2016, 18:16
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#5
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Registered User
Join Date: Aug 2010
Location: Central California
Boat: M/V Carquinez Coot
Posts: 3,782
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Re: Twin v. Single Keels
Hope "blue boat" has mast, boom and sails.
__________________
Kar-KEEN-ez Koot
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11-03-2016, 22:30
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#6
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Registered User
Join Date: Apr 2007
Location: Australia
Boat: Island Packet 40
Posts: 6,415
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Re: Twin v. Single Keels
Quote:
Originally Posted by BigNickMontana
That boat is just frikin cool.
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Yeah, and look at how stable it is, held down with four ocky straps.
From a wetted surface viewpoint those skinny foils look as though they would not add much wetted surface anyway. Looks fast just sitting on the trailer.
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11-03-2016, 22:49
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#7
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Registered User
Join Date: Oct 2010
Location: Wandering the US Gulf Coast
Boat: 78 Pearson323 Four Winds
Posts: 2,212
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Re: Twin v. Single Keels
Sure doesn't look like a typical tiller steered 27 footer made from plywood does it? It is, RM 890.
__________________
Life begins at the waters edge.
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12-03-2016, 08:42
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#8
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Registered User
Join Date: Feb 2016
Boat: 66' Spencer 42' Sloop
Posts: 399
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Re: Twin v. Single Keels
Quote:
Originally Posted by Polux
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I had a bit of a headache last night so I did not read that article until this morning, really really great article, thank you really explained things to me and validated a lot of thoughts that I had.
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12-03-2016, 09:05
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#9
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Registered User
Join Date: Nov 2011
Location: Portugal/Med
Boat: Comet 41s
Posts: 6,140
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Re: Twin v. Single Keels
Quote:
Originally Posted by markpierce
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Yes, all that and it is also a very good sailboat that sails very well even with light winds, a sailor's boat. That boat become quickly famous because one of the first clients was probably the world's best ocean monohull Solo racing sailor, that bought one for cruising.
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12-03-2016, 13:55
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#10
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Moderator
Join Date: Sep 2014
Location: Channel Islands, CA
Boat: 1962 Columbia 29 MK 1 #37
Posts: 14,261
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Re: Twin v. Single Keels
I think all boats are designed for a purpose and a locale. If I were cruising in northern latitudes where there were shallows and big tidal flows, I'd probably look for a boat with bilge keels so I could do this without spilling my coffee or Sheep Dip:
__________________
DL
Pythagoras
1962 Columbia 29 MKI #37
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12-03-2016, 17:25
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#11
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 9,626
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Re: Twin v. Single Keels
Quote:
Originally Posted by Don C L
I think all boats are designed for a purpose and a locale. If I were cruising in northern latitudes where there were shallows and big tidal flows, I'd probably look for a boat with bilge keels so I could do this without spilling my coffee or Sheep Dip:
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Sheep dip????
Sent from my iPhone using Cruisers Sailing Forum
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12-03-2016, 17:36
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#12
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Moderator
Join Date: Sep 2014
Location: Channel Islands, CA
Boat: 1962 Columbia 29 MK 1 #37
Posts: 14,261
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Re: Twin v. Single Keels
Quote:
Originally Posted by Sailmonkey
Sheep dip????
Sent from my iPhone using Cruisers Sailing Forum
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Yep, pretty good stuff.... good enough to warrant bilge keels. Maybe that's why they have so many bilge keelers in UK?
__________________
DL
Pythagoras
1962 Columbia 29 MKI #37
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12-03-2016, 17:51
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#13
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Senior Cruiser
Join Date: Jan 2010
Location: PORTUGAL
Posts: 30,561
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Re: Twin v. Single Keels
Quote:
Originally Posted by Sailmonkey
Sheep dip????
Sent from my iPhone using Cruisers Sailing Forum
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Obviously took DOJ and his Goat seriously.
__________________
It was a dark and stormy night and the captain of the ship said.. "Hey Jim, spin us a yarn." and the yarn began like this.. "It was a dark and stormy night.."
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12-03-2016, 18:09
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#14
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 9,626
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Re: Twin v. Single Keels
Quote:
Originally Posted by boatman61
Obviously took DOJ and his Goat seriously.
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That was the youngest goat to solo circumnavigate!!
Sent from my iPhone using Cruisers Sailing Forum
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12-03-2016, 21:32
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#15
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Registered User
Join Date: Feb 2016
Boat: 66' Spencer 42' Sloop
Posts: 399
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Re: Twin v. Single Keels
So, twitn keel or Catamaran that is the question?
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