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Wire block on backstay

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Malc View Drop Down
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    Posted: 11 May 2014 at 01:43
Hello All,
I am currently refurbishing the running rig on my 315.  The aluminium sheave fitted to the wire block at the end of the backstay has become badly corroded and has seized up completely.  As the sheave cannot be removed from the side plates, the whole block will need to be replaced.  I have been looking around on the internet to find a replacement.  The closest I have been able to find is a wire block made by Barton, which has a 45mm dia. brass sheave.  It is a quality block, but the sheave is about 10mm smaller in diameter than the original.  I have not been able to find a direct replacement.  Does anyone know who made the original block, or where I could get hold of a suitable replacement?
On another note, has anyone encountered a similar problem with their backstay?  The boat is from 2007 and is generally in very good order.  Other original parts of the rig look almost new, yet this block is in a terrible state.  I am wondering if dissimilar metals could be the cause?
All comments welcome.
Thanks
Malc


Hanse 315 - 'Antares'
Hull No. 315/692
Call sign 2HMI8
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Inopio View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Inopio Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2014 at 00:29
Hi Malc, 

we had the same problem with our 312. It is recommended that you choose a metal pulley body. If the pulley is a larger, better diameter. But a good metal body slightly smaller pulley, will work better than it did before. 


Good luck.

Inopia
Hanse 312
Bahía de Cádiz, Spain
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Frode View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Frode Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2014 at 06:09
Mine looked just as bad. Unfortunately my Sparcraft mast broke last September, not for this reason. On the brand new Selden mast for my Hanse 315 the lowest part of the aft stay is Dyneema and not wire.

Edited by Frode - 15 May 2014 at 06:10
Frode, Stavanger/Norway
Hanse 315 # 390
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Nick_R View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nick_R Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2014 at 08:55
Mixing aluminium, stainless steel and salt water is a good recipe for galvanic corrosion.
These days backstays are usually dyneema for light weight, so you might consider replacing at least the lower wire part. Or go with the Barton.

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skipper View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote skipper Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2014 at 09:59
I have Rutgerson/SPR wire blocks and I remember from a thread on hanseklubben.se or myhanse that some Hanse yachts have had broken "no-label/noname" wire blocks.
Our 2 wire blocks looks fine but the sheaves needs to be greased so they can rotate easier, not sure which spray that is best; tried 5-56, 6-66 and PTFE.
Still hard to get the sheaves to rotate.


Edited by skipper - 15 May 2014 at 10:00
Cheers,
Skipper
Hanse 342 2005 (Sparcraft mast, white hull, wheel steering, deep draft keel, short rudder)
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Malc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Malc Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2014 at 00:35
Hi Guys,
Thanks for the posts. Much appreciated. I will have a look at the Barton block, but changing the wire running back stay for Dyneema sounds like a interesting idea.
Malc
Hanse 315 - 'Antares'
Hull No. 315/692
Call sign 2HMI8
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Malc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Malc Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2014 at 00:47
Frode,
Do you have any photos of the new set up for your backstay? I have been looking around for a suitable wire block, but it never occurred to me to also replace the running wire with Dyneema. This might be a lot more straight forward.
Thanks
Malc
Hanse 315 - 'Antares'
Hull No. 315/692
Call sign 2HMI8
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Barton Marine Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2014 at 12:04
Barton Marine manufacture larger diameter sheave blocks for wire rigging, check out part numbers 91 600 and 91 700, rated up to 3,000kg break load
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iemand View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iemand Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2014 at 12:20
or take a look at the selden wire blocks...
Hanse 312 MJ 2004 - Hanse 370e MJ 2007
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Inopio Quote  Post ReplyReply Direct Link To This Post Posted: 10 September 2014 at 19:54
Hi All,

perhaps this is one of the best solutions for the back-stay. A generous metal pulley diameter and dyneema rope.


Inopia
Hanse 312
Bahía de Cádiz, Spain
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