Wing keel vs fin. 
I think, today's winged keels are the best, most practical, and efficient way 
to shorten draft, but sailing performance will be better w a deep, narrow fin. 
The wing gets the weight low, and maintains lift and righting moment. When the 
boat is heeled, the wings work like an endplate and improve lift and reduce 
leeway. However, most experts state that a deep fin will work more efficiently, 
point higher and be slightly faster. This is easily proven by comparing the 
PHRF ratings that give give credit to winged keels over fin, yet when checking 
this model the difference in PHRF is only 3 secs. 


Summary: The difference in draft of 17" is probably more important than the 
difference in performance of 3 sec/mile. 


Chuck 
Resolute 
1990 C&C 34R 
Broad Creek, Magothy River, Md 

----- Original Message -----

From: "robert via CnC-List" <cnc-list@cnc-list.com> 
To: cnc-list@cnc-list.com 
Cc: "robert" <robertabb...@eastlink.ca> 
Sent: Sunday, May 1, 2016 11:35:19 AM 
Subject: Stus-List Wing Keel Lift? 

The America's Cup left the NYYC in 1983 but I believe Dennis Conner won it back 
in Perth, Aus, in 1987. 

So, correct, it did not return to New York City but I am confident the 
Americans won it back with an even different keel......I have a book somewhere 
on the keel he used in Perth......it's like a fin keel with an extension that 
goes back.....there a name for it.....they kept it under raps until after the 
races. I'll look it up later. 

Conner's tested it in Hawaii before bringing it to Perth......it worked. 

Rob Abbott 
AZURA 
C&C 32 -84 
Halifax, N.S. 

On 2016-04-30 4:27 PM, Jerome Tauber via CnC-List wrote: 


(Sorry - first posted this as reply to wrong posting). Keel lift is a 
horizontal, not vertical force. Keels are hydrodynamic foils - when they are 
moved through water they cause both lift and drag forces to develop. Lift is 
the positive lateral force that allows a boat to move to windward - drag is the 
negative, resisting force. A good sailboat keel design has a high lift-to-drag 
ratio. Wing keels were developed by the Australians to win the 1983 America's 
Cup (first U.S. loss) by getting around the keel depth rules. When the boat 
heels, the wings increase the draft of the keel creating additional lift. This 
being said, I'm sure the angle at which the wing cuts into the water does have 
an effect but that is not what is meant by keel lift. The America's Cup left NY 
in 1983 never to return but this May there will be some preliminary cup races 
in NY Harbor with boats that truly do lift out of the water. Jerry 



-----Original Message----- 
From: Lorne Serpa via CnC-List <cnc-list@cnc-list.com> 
To: cnc-list <cnc-list@cnc-list.com> 
Cc: Lorne Serpa <lorne.se...@gmail.com> 
Sent: Sat, Apr 30, 2016 2:47 pm 
Subject: Stus-List Wing Keel Lift? 

So, working on buying my 1st sailboat greater than 15'. It's a 1988 30MkII. 
It has a wing keel. I read somewhere that a wing keel generates some lift. 
So.... 
Does a wing keel create lift? 
Should I have more heavy stuff at the back of the boat for increased angle of 
attack on the keel? 
Or.. 
don't be silly.. its a 8,000lb boat going 5 knots. It does nothing. 
Lorne 
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_______________________________________________

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
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_______________________________________________ 

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated! 

_______________________________________________

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!

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