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Cap shroud fitting

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Jan D View Drop Down
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Joined: 09 May 2011
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Post Options Post Options   Quote Jan D Quote  Post ReplyReply Direct Link To This Post Topic: Cap shroud fitting
    Posted: 09 May 2011 at 10:16pm
Hello,

Could someone please help me out?

I am looking at a CO32 and have a question about the triangular reinforcement
laminated to the hull under decks ( port and starboard), where the cap shroud
chainplates are attached to. (bolted through) 

Is it normal that these reinforcements are not bonded over their entire width
to the underside of the deck? At the innermost side(s) there is a small gap between
reinforcement and underside of the deck over a length of at least a couple of
inches. 
The fitting to the hull's inside itself seems complete.
  
Hope I explained my problem properly, since I am a native Dutch speaker. 
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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 2011 at 11:49am

Hello Jan,

I think it is the same on my boat.  Most of the loading on the cap-shroud appears to be transmitted to the hull rather than the deck.  I had this same situation in my previous boat (a GK24), but that had so much rig tension (fractional rig with swept back spreaders) the hull developed dimples!

 
The most important thing to check with the Cap-shroud U-bolt is that the stainless steel bar that passes through the GRP knee has a flat machined on the underside so that the nuts are tightened onto a flat surface. 
May be worth dropping a mail to Jeremy Rogers about this so see if he has any comment.

 

Hope this helps.



Edited by George Isted - 10 May 2011 at 11:54am
George Isted
www.solentboatbutler.co.uk
Contessa 32 "Concerto"
Co32 Class Measurer and ex Class Captain.
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Jan D View Drop Down
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Post Options Post Options   Quote Jan D Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2011 at 10:14pm
Thanks for your swift and to-the-point reply George!

I already suspected that logically the hull bonding was principally designed to take the brunt of the loading of the cap shroud(s), but looking at the reinforcement it had me wondering why the deck joining was not involved in the process. Structurally this would make sense I suppose.

Your point about the U Bolts has been duly noted with appreciation.

On the topic of asking Jeremy Rogers himself - call me coy -  but I am hesitant to question any engineering skills on an otherwise  undoubtedly brilliant design.

Salut

Jan



 

  
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chris View Drop Down
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Post Options Post Options   Quote chris Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2011 at 1:58pm
I have a question regarding rigging tension, here in a marina everyone has a different opinion.

Are the shrouds supposed to be so tight that when you pull the cap shrouds for example the mast does not bend at the top?

As for the lowers, I understand the inner (aft) are supposed to be tighter to induce mast bend (sorry not sure of the correct terminology), the forward (bow) lowers however as I was told by one of the many opinionated people here in the marina says that the opposite has to be the equal tension .i.e. The port lower inner stay is balancing the s.board lower outer stay, therefore how can tension them differently?

Since the rigger looked at the tension there is more movement in the stays, not sure if it's the increased temperature, or the wires being stressed a alot and stretching. I am tempted to tighten them all guitar string solid as suggested my an owner of an X-yacht who had lost two masts due to incorrectly tensioned rigging.

Appreciate your replies.
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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2011 at 10:47am

Hi Chris,

I’m no expert so I would suggest you take the advice of a rigger.  However your friend with an X-yacht has a significantly different rig (fractional, bendy, swept back spreaders, runners, etc) compared to the basic and relatively bulletproof masthead-rig on a CO32.  My rig certainly isn’t bar tight and there is a little slack in the leeward rigging when beating in force 4 and above, I think this is normal.

 

There is a rig setup guide in the technical section of the website, it is called “setting up your Contessa for racing” by Ian Brown and this should help.  Selden also do a rig setup guide on their website that is free to download and worth a browse.

 

I hope the above helps.

George Isted
www.solentboatbutler.co.uk
Contessa 32 "Concerto"
Co32 Class Measurer and ex Class Captain.
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St Paddy View Drop Down
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Post Options Post Options   Quote St Paddy Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jun 2011 at 1:13pm
Hi
I have just sorted the same problem

I have got Rob form Marine Team to strengthen the whole area. He has bonded the deck and formed a nice box section using the shelf as well. I then manufactured new fittings from 12mm 316 and brought the load down 200mm. I have also started a 2nd set. One problem you might have is the bulk head is not square to the deck so the fitting has to come back a bit mine was around 6mm and then the pad on the deck was wrong. Rob fixed it.

I also manufactured new lower fitting and angled them in 8 degres. one of my old Gibb fittings had a crack on one side due to the side load.

I hope to be at the 40th so come as see

Robin
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