[Public-list] Backstay replacement...

[sousa, stephen (ENG)]

George,

Sorry for the delayed response, I have tied up building a new VW diesel
engine over the past few days, almost done. With the price of fuel
definitely worth the time and effort.

I checked the chain plate for the back stay she is held in place with 3 5/16
bolts with stainless backing plates as all other chain plates are on 114. We
have been sailing with 9/32 wire on all uppers, fore and aft since 97
without incident.  When we ran the numbers with our rigger he and I felt it
was a good choice and modifications made to #114 could support these
changes. 

As you know we have made many changes to this boat over the years which made
it stronger than she was originally and A30 members comments defiantly
helped.

Also if anyone is looking at modifying the head area, we installed cherry
with moldings in the spring, she looks nice down below.

Rich Hargraves sent me photos of his bow roller, the current project is
going to be a stainless stem head fitting with integral bow roller. We a
designing this modification currently not sure how I going to handle the off
set with one piece. Our intension is to have integral chocks which removes
the stress from the toe rail and also installing a windlass. When this
project is complete, I will scan a few shots for the Alberg web site if you
like to post them. 

Thanks for you concern and please if you feel items mentioned in the future
do not play well for other I appreciate your response.

Best regards,
Stephen

   

-----Original Message-----
From: public-list-bounces at alberg30.org
[mailto:public-list-bounces at alberg30.org] On Behalf Of George Dinwiddie
Sent: Thursday, October 28, 2004 5:37 PM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-list] Backstay replacement...


Stephen,

I don't think I've heard of a dismasting due to wire failure.  And I 
think that to use the additional load capacity of the wire you'll have 
to upgrade the attachment points.  As delivered, the bolts holding the 
chainplates (including the backstay) are about half the strength of the 
wire.  You'd have to do more than the 5/16" bolt upgrade to hold the 
9/32 wire down.

In other words, I think you may be optimizing in the wrong place.

  - George

sousa, stephen (ENG) wrote:
> Brian,
> 
> I would recommend upgrading from 1/4 wire to 9/32 the safe working 
> load of 1/4 is 6900 lbs and 9/32 is 9400 for a minimal increase in 
> cost you gain a significant SWL.

-- 
  ----------------------------------------------------------------------
   When I remember bygone days                         George Dinwiddie
   I think how evening follows morn;            gdinwiddie at alberg30.org
   So many I loved were not yet dead,           http://www.Alberg30.org
   So many I love were not yet born.
                                             'The Middle' by Ogden Nash
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