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Catalina/Capri 25/250 Sailor's Forums

Catalina 25 Specific Forum

upper to chainplate attachment

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Gloss
Master Marine Consultant

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USA
1916 Posts

Initially Posted - 11/15/2003 : 09:10:41

Hi folks,
It's a rainy dreary day here in Knoxville. My 25 is hauled out for the winter, sitting in my driveway, (boatyard) and ready for more upgrades before my Keys trip in February.
I was wondering what the proper way was to attach the uppers to the chainplate. It seems the chainplate has two holes, which one should be used, the inner, or outer hole. Does it matter?

Frank Gloss
Formerly 89WK/TR
85 Ericson 32-3 shoal draft "Molto Bene"

Edited by - on

lcharlot
Master Marine Consultant

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Antigua and Barbuda
1301 Posts

Response Posted - 11/15/2003 : 11:10:30

I think the upper shroud is intended to attached to the outer hole in the chainplate, with the inner hole used for attachment of the "temporary jumper shrouds" that are part of some mast-raising systems like the "Huntington Rig" and are removed as soon as the mast is up and secured.

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GeorgeB
1st Mate

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90 Posts

Response Posted - 11/15/2003 : 21:33:55

Frank,

I think that Larry has that about right. I used the inner hole on the starboard chain plate to rig a halyard to the spreader to hang courtesy flag and dry swim suits

Let's get together some time. I'm on the other side of the lake in Maryville, Any your sure on the money about the dreary weather. Glad that I got the boat painted two weeks ago.

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rclift
Navigator

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USA
152 Posts

Response Posted - 11/16/2003 : 02:04:17

My recollection was that it had to do with whether you had a tall rig or standard rig. Tall use the outer hole, standard the inner. (I'm sure a whole 3/4 of an inch makes a big difference

)

Ray Clift
Buzz 1361

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 11/16/2003 : 10:14:55

Maybe the chain plate is a generic one that Catalina uses on models that use only one chain plate for both the upper and lower shrouds(like my old Venture 25}, and they put it on the C25, as George mentioned, for things like spreader halyards.

I dunno...just a thought.

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Bill Holcomb
Admiral

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USA
769 Posts

Response Posted - 11/17/2003 : 10:57:39

Actually, Ray has it right. The standard rig spreaders are shorter than the spreaders for a tall rig. Hence, to keep the upper shroud as nearly vertical as possible, the standard rig should use the inner hole on the upper shroud chain plate. And, the tall rig should use the outer hole.

Some skippers may doubt that it's that important. That a small angle change could be that important. But, it is. The spreader needs to bisect the angle of the upper shroud in order to keep its loading in pure compression. If the angles are different, the spreader can experience an excessive buckling load......especially in stronger gusts or heavy weather sailing. If the spreader tip slips, the spreader could collaps; resulting in dismasting.

So, inner hole for standard rig; outer hole for tall rig.

Bill Holcomb - Snickerdoodle #4839

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 11/17/2003 : 11:07:13

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Actually, Ray has it right. The standard rig spreaders are shorter than the spreaders for a tall rig. Hence, to keep the upper shroud as nearly vertical as possible, the standard rig should use the inner hole on the upper shroud chain plate. And, the tall rig should use the outer hole.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

That's kind of important and I'm surprised that Catalina doesn't mention this in the owner's manual!

Thanks Bill and Ray for the heads up, you may have saved a few rigs today.

Edited by - dlucier on 11/17/2003 12:08:48

Gloss
Master Marine Consultant

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USA
1916 Posts

Response Posted - 11/17/2003 : 15:13:25

So that's why we have innies and outies.
Thanks

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deastburn
Captain

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USA
334 Posts

Response Posted - 11/19/2003 : 14:25:56

A complete and holely adequate response.

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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.