[Alberg30] tunning, shroud tension

[Gord Laco]

I agree with George.

Our shroud tensions should have more to do with the secuity of attachment
and performance than the capabilties of the wire.   We supplied a new rig to
an Alberg last year and made whole deal 1/4" to standardise the fittings...
his lower shrouds did not get tighter because of the increase in diameter.
Their tension is governed by the need to keep the mast in column and control
bending - none of that changed.

ps I've never heard of a rigging failure that involved wire breaking
(although I've been aboard boats with rigs that looked horrifying)  The
trouble is usually A) Spreader failure B)Mast tang or chain plate failure
Gord.
#426 "Surprise"

----- Original Message -----
From: George Dinwiddie <gdinwiddie at min.net>
To: <public-list at alberg30.org>
Sent: Thursday, January 10, 2002 10:32 AM
Subject: Re: [Alberg30] tunning, shroud tension


> What is this guideline based on?  It seems like other parts of
> the boat should also be considered.  For example, if you just
> upgraded the rigging to heavier wire, would you want to increase
> the tension?  Does stronger wire mean the rigging should be
> tighter than than if weaker wire is used?
>
> It seems to me that this guideline makes a lot of assumptions
> about the boat's design and construction.  The Alberg 30 has
> relatively heavy rigging compared to other boats its size.
>
>  - George
>
> > Brian and Elaine Timmins said:
> >
> >From my Loos Instructions, 1/4" wire breaking strength is 8200
> >lbs and 3/16" is 4700 lbs. Additionally, Loos recommends 1/4"
> >forestay set to 1300 lbs, 1/4" shrouds set to 850 lbs, and 3/16
> >shrouds set to 500 lbs.
> >
> >   From: Dave Terrell
> >
> > >How do these numbers fit with the general guidelne that shrouds
> > >should be tensioned between 10 and 12% of the breaking strength
> > >the wire? This is what the instructions for my Loos tension guide
> > >said and that has been my guideline in the past. That worked on my
> > >old boat, a CAL 27 T-2. If the application of the rule to my "new"
> > >Alberg 30 is different, I would like to know. I appreciate having
> > >this source of informatioin avaliable.
>
> --
>  ----------------------------------------------------------------------
>   George Dinwiddie                             gdinwiddie at alberg30.org
>   The gods do not deduct from man's allotted span those hours spent in
>   sailing.                                    http://www.Alberg30.org/
>  ----------------------------------------------------------------------
>
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