{Stus-List} keel reduction

rspence7 rspence7 at cox.net
Sun Feb 3 16:01:52 EST 2008


Oops, that's supposed to read "Kicking"  freudian slip!

Roger
----- Original Message ----- 
From: "rspence7" <rspence7 at cox.net>
To: <cnc-list at cnc-list.com>
Sent: Sunday, February 03, 2008 2:35 PM
Subject: Re: {Stus-List} keel reduction


> Peter,
> All of your ruminations on keel depth are probably accurate, but the 
> biggest
> changes in keel thinking came from the Aussies licking Dennis Conner's ass
> in the America's Cup with their winged keel.
>
> More NACA keel development came from that event than probably all recorded
> history up to that point!
>
> Roger
>
> ----- Original Message ----- 
> From: "Peter Deppisch" <peter.deppisch at sympatico.ca>
> To: <cnc-list at cnc-list.com>
> Sent: Sunday, February 03, 2008 12:21 PM
> Subject: Re: {Stus-List} keel reduction
>
>
>>I have seen this done at Bayfield Marine Services.  They take a chainsaw
>> and cut-off the keel at the desired depth and then bolt on two half
>> bulbs and fair and paint and you would think that it was designed that
>> way.
>>
>> Basically keel depth gives you upwind performance.  If you look at the
>> Cruising Club of America (CCA) boats designed in the '60's they all had
>> shallow draft in relationship to length or a keel/centreboard
>> configuration.  The C&C designed Corvette31, keel/centreboard, or the
>> C&C Redwing 30 with a draft of 4' 6".  I think C&C may have looked at
>> the Hinckley Bermuda 40 to see what was current in sailboat design at
>> the time.  My opinion anyway.
>> http://www.yachtworld.com/core/listing/boatFullDetails.jsp;jsessionid=agSv0fmmhXQh?boat_id=1567116&ybw=&units=Feet&currency=USD&access=Public&listing_id=38184&url=
>>
>> In the '70's the draft increased.  The  C&C 35 MK I has a draft of 5'
>> 3", my C&C 35 MK II draws 5' 6".  The Viking 33/34 draws 5' 6" and 6'
>> respectively and the C&C 35 MK III has a draft of 6' 6", I think.
>>
>> The winged keel reduces draft and is supposed to make up for loss of
>> upwind performance because of lack of keel depth.
>>
>> A long time ago I read that a boat needs to be able to claw of a lee
>> shore under sail alone.
>>
>> Peter
>> S/V Tangerine
>>
>> cscheaffer at comcast.net wrote:
>>> I'm considering the same thing.
>>> Checkout the new website at:
>>>
>>> marskeel.com
>>>
>>> Go to Services, Keel Reduction, etc
>>> There are some great photos and an explanation of the weight increase
>>> involved.  The waterline will be a little higher.  I wonder what the
>>> yard charges?
>>>
>>> Chuck
>>> C&C 34R
>>>
>>>
>>>
>>>
>>>     -------------- Original message --------------
>>>     From: "Bob MacKenzie" <mackbob at mnsi.net>
>>>
>>>     I'm looking into the possibility of cutting 16 inches off the keel
>>>     of my C&C 34 (1978) to cope with lowering water levels in Lake St.
>>>     Clair and Lake Erie. This wouldreduce my draft to five feet. Local
>>>     boatyard has checkede with Mars metals (wwhich cast original
>>>     keels) and it has worked out how much lead I will have to add to
>>>     maintain current stability. They will double check templates for
>>>     keel, then cast two pods to bolt through keel. They had figures
>>>     right at hand, so obviously they have done this before. Anyone
>>>     have any first-hand experience with this, or have any comments? (I
>>>     gave up racing five years ago, and have already added a
>>>     self-tacking jib, so I'm thinking from a cruising point of view.
>>>     Bob MacKenzie
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>> Subject:
>>> {Stus-List} Fw: keel modifications
>>> From:
>>> "Bob MacKenzie" <mackbob at mnsi.net>
>>> Date:
>>> Sun, 3 Feb 2008 02:05:47 +0000
>>> To:
>>> "Cnc-List at Cnc-List.Com" <cnc-list at cnc-list.com>
>>>
>>> To:
>>> "Cnc-List at Cnc-List.Com" <cnc-list at cnc-list.com>
>>>
>>>
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>>
>> -- 
>> Paraphrasing Pogo:
>> We are like Nero - fiddling while the Earth burns!
>> Website:
>> http://www3.sympatico.ca/peter.deppisch
>> http://peter.deppisch.googlepages.com/
>>
>>
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>
>
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