[Public-List] Public-List Digest, Vol 3193, Issue 2

[Don Campbell via Public-List]

Stephen:
    Don't rely on your impression when it comes to engineering strength. You 
might want to read some of the Gougeon's book on boat construction for an 
explanation in more lay terms than engineering texts, but the strength is in 
the truss system which relies on the core being structurally sound and fully 
bonded to the laminates on the three sides for the knees. Polyester lay-ups 
are not strong on their own, and epoxy lay-ups are not really much better on 
their own.
Don

-----Original Message----- 
From: Stephen Gwyn via Public-List
Sent: Sunday, February 07, 2016 12:32 AM
To: public-list at lists.alberg30.org
Subject: Re: [Public-List] Public-List Digest, Vol 3193, Issue 2

Hi,

I just pulled, cleaned and rebedded half my shroud chainplates (the three
on the starboard side). It took about 5 hours. Everything was very wet. But
all the metal was all rust-free and the wood was unstained and quite hard
when I poked it with a knife. The chain plate for the upper shroud was
quite damp, but as far as I can make out, it was damp with salt water from
the last time I had the rail underwater. Lots of shiny crystals. Probably
too salty for rot.  I used 3M4000 (polyether). Much better handling and
much faster cure time than Boatlife polysulfide. We'll see how long it
lasts.  I gave the port chainplates a hard look and they appear much the
same.

My impression of the fibreglass/wood knees for the lower shrouds is that
the wood is just there as a spacer. The strength is all in the fibreglass.

SG
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