[Public-List] Knee replacement

[Bob Crinion]

Hi All,

After discussing my bulkhead problem (#560) with a local "Navel"
Architect...
He recommended Lloyds of London Construction grade 3/4" Mahogany plywood.
He also stressed the issue of chainplates fastening to bulkhead and thus
required a certain spec of plywood. The original bulkhead was teak but was
not available so I used the Mahogany plywood.
I used epoxy sealer on the plywood with extra applications to the end grain.

-bob


-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Hugh McCormack
Sent: March 31, 2009 4:41 PM
To: public-list at lists.alberg30.org
Subject: [Public-List] Knee replacement


Good day all,

 

The recent thread concerning chain plates and weak knees due to water
infiltration (water in the knees...no wonder we think of boats as living
things) and the parallel discussion about the strength of plywood or
hardwood prompts my questions.

 

Has anyone replaced their knees (and/or bulkheads) with new ones made of
King Starboard?  If so, what is the relative strength of Starboard compared
to plywood or hardwood?

 

I have searched the list archives but can find no discussion of the use of
King Starboard except for replacement of the spacers under the jib or genoa
tracks.  The King website says that the product's tensile strength is 4100
psi but they don't say for what thickness of material.  If this applies to
3/4" material then it appears to be considerably stronger than plywood.  It
also suggests that thinner material could be used in a repair/replacement.

 

Does anyone have any experiences or thoughts?

 

Cheers,

 

Hugh

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