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RichardG
Admiral

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USA
990 Posts
Initially Posted - 02/20/2017 :  10:55:45  Show Profile
Why does one often use a D shackle for the main halyard, but instead use a snap shackle for the jib halyard?


RichardG 81 FK/SR #2657
Terminal Island, CA

Steve Milby
Past Commodore

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USA
5851 Posts
Response Posted - 02/20/2017 :  11:18:14  Show Profile
A D shackle is very secure. I have seen snap shackles disconnect unintentionally on several occasions. If it happens on a halyard, the halyard will likely go to the masthead. You can reduce that possibility by having your crew look at the snap shackle to be sure that the pin is securely in the hole when they close the shackle. I used a snap shackle for the jib tack on my C25, and it worked fine, but I used a D shackle for the halyard.

There's another consideration. A snap shackle is longer than a D shackle. My Cal has a snap shackle on the jib halyard. I tried using a snap shackle on the jib tack, too, but it added enough length that I couldn't tighten the luff of my racing 155 genoa enough to eliminate scalloping in strong winds. Using one snap shackle might not be a problem, but if you use one at the tack and one at the head of the sail, it might cause that problem. It depends on how closely your sail is cut to it's maximum size.

Choosing between a snap shackle and a D shackle is mostly a matter of personal preference and convenience.
Steve Milby J/24 "Captiva Wind"
previously C&C 35, Cal 25, C25 TR/FK, C22
Past Commodore
Edited by - Steve Milby on 02/20/2017 11:49:43
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islander
Master Marine Consultant

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USA
3992 Posts
Response Posted - 02/20/2017 :  12:04:27  Show Profile
Interesting, I always thought that a snap was used on the headsail to make changing between sails easier. Using a D on the main is more secure but is more difficult to open but usually doesn't need to be disconnected very often.
Scott-"IMPULSE"87'C25/SR/WK/Din.#5688
Sailing out of Glen Cove,L.I Sound


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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 02/20/2017 :  12:22:00  Show Profile
I used key-pin shackles for both halyards--relatively secure but quick and easy to open. (Although with roller furling, I opened them about twice a year.)
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
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Steve Milby
Past Commodore

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USA
5851 Posts
Response Posted - 02/20/2017 :  13:05:14  Show Profile
I use these on both main and jib halyards on my C&C. They're secure, and much easier to use than shackles with a threaded pin. I usually have to use a Leatherman tool to unscrew those shackles. These have a little lever that helps you turn the key pin. I have seen some made of stamped steel, but they look unsecure. The ones on my boat have a much longer lever, which makes them even easier to use for elderly fingers, but I don't know their brand.
Steve Milby J/24 "Captiva Wind"
previously C&C 35, Cal 25, C25 TR/FK, C22
Past Commodore
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sethp001
Mainsheet C-25 Tech Editor

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814 Posts
Response Posted - 02/20/2017 :  20:23:36  Show Profile
I have a snap shackle for the tack of the jib, but use a key-pin shackle for jib halyard and main halyard, like Dave and Steve.


Seth
"Outlier" 1987 Catalina 25 SR/SK/Traditional Interior #5541
"Zoo" 1977 Morgan Out Island 30
"Nomad" 1980 Prindle 16
"Lost" 1988 Catalina Capri 14.2 (sold - yay!)
"Marine Tex 1" Unknown Origin POS 8' Fiberglass Dinghy
https://whichsailboat.com/2014/07/27/catalina-25-review/
Edited by - sethp001 on 02/20/2017 20:44:35
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OLarryR
Master Marine Consultant

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USA
3367 Posts
Response Posted - 02/21/2017 :  10:20:42  Show Profile  Visit OLarryR's Homepage
I have key-pin shackles as Dave as shown in his posting - They are both halyards. It seems secure - Never has given way.
Larry
'89 Robin's Nest#5820, Potomac River/Quantico, Va
http://catalina25.homestead.com/olarryr.html
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dasreboot
Admiral

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803 Posts
Response Posted - 02/24/2017 :  06:25:40  Show Profile  Visit dasreboot's Homepage
i would not put a snap shackle on anything that goes up!maybe if you secured the ring with a tie wrap or wire, but that defeats the purpose doesn't it!
Todd Lewis
Eowyn 87 TR/WK C25 #5656
ARWEN 84 TR/SK C25 #4031
www.mainsailsailingschool.com
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.