[Public-List] Mast Beam Repair

[crufone at comcast.net]

Hi Rachel, 

 No worries, not really a correction.  The discussion was about why the glue failed and the stresses applied to it not the beam as a whole.  In the old boats the beam itself really doesn't fail, it is the glue holding the laminates together which fails, in 95% of the cases which I know about. 

Michael #133 
----- Original Message ----- 
From: "Rachel" <penokee at cheqnet.net> 
To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org> 
Sent: Thursday, January 7, 2010 11:28:59 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [Public-List] Mast Beam Repair 


On Jan 7, 2010, at 11:03 AM, crufone at comcast.net wrote: 

> Rachel, as the beam is compressed from above center on the arc it   
> wishes to extend outward a thwratships.  This places the glue   
> between the laminates under sheer stress. When the glue fails it   
> allows the a thwartships movement which inturn allows the beam to   
> 'flatten' in the middle ( from the top downward)and the rig to lo se   
> tension. 

Thanks for the correction! 

I'm used to thinking of sheer and tension in regards to fasteners, and   
somehow when I applied that in my mind to the beam, I came up with   
tension.  Clearly incorrect, and I appreciate your explaining why. 

Rachel 
ex-#221 

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