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S&S Swan General - Nautor original chain hook
04 March 2013 - 00:02
#1
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matteosalamon
Join Date: 29 January 2007
Posts: 1145

Nautor original chain hook
Dear All,

I have been asked to post JPG's of my chain hook, original made by Nautor. It is quite useful, as you can easily couple it to the chain and very quickly release it if in a hurry, and (of course!) designed and made to last for a lifetime.

This is for a 8 mm chain, for bigger ones you have to change measurements.

Fair winds!

matteo (38/067 Only You)
04 March 2013 - 00:04
#2
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matteosalamon
Join Date: 29 January 2007
Posts: 1145

06 March 2013 - 16:16
#3
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danielefua
Join Date: 30 January 2007
Posts: 467

Thank you Matteo for these pictures, that hook is indeed an elegant solution worth some musing.
Just a question for anybody interested in speculating about it: is the second longitudinal slot toward the stern really necessary? If not, only one centred shackle might suffice.
The slot and the twin shackles seem to be necessary if the chain is perfectly in line with the rope but, apparently, this is not the actual situation.

Daniel, 411/004
07 March 2013 - 07:24
#4
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the professor
Join Date: 02 January 2008
Posts: 1547

Dear Daniel
Your observation is correct, if the chain is under high load and you want to unload it with a line pulling in the same direction the second slot is required.
Ships use similar systems for unloading their windlasses, and there are a number of variations on the theme.
Best regards
Lars

13 March 2013 - 08:24
#5
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Florence
Join Date: 26 July 2012
Posts: 9

Is it possible to buy one of these anywhere?

Thanks
Florence
13 March 2013 - 08:27
#6
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matteosalamon
Join Date: 29 January 2007
Posts: 1145

No

Matteo (38/067 Only You)
20 March 2013 - 12:34
#7
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philippeV
Join Date: 02 February 2007
Posts: 203

Hi Matteo and Florence. Very nice pictures indeed.
There is a good chain hook in the Osculati catalogue, and we have been using it for many years with great satisfaction. Different dimesions for 8 mm chain, and 10 and above. We prefer to install it ouside of the bow roller as this avoids the noise of the chain rubbing on rocks on the bottom getting into the boat.
Sorry if you feel this is obvious!
Fair winds and happy sailing.
Ph. Vidal 41/022
22 March 2013 - 22:21
#8
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Florence
Join Date: 26 July 2012
Posts: 9

Thank you very much for the links.
I appreciate it. Just wondering ,for the aft block would large backing plates made of G10, Carbon or stainless inside the anchor locker be an idea? .


Florence
14 April 2013 - 15:56
#9
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danielefua
Join Date: 30 January 2007
Posts: 467

With a great help from Matteo I was able to make a technical drawing of the chain-hook. I am not sure it is identical to the original but it is quite close.
As the original, the size of this is for a 8 mm chain; does anyone have suggestions on which critical sizes should be increased for a 10 mm chain apart from the obvious ones which are affected by the different shape of the chain links?
For example the stainless steel sheet thickness of the main body should be brought from the present 6mm to 7 or even 8 mm?
Comments and suggestions are welcome.

Daniel, 411/004

Chain-hook drawing
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