[Public-List] Public-List Digest, Vol 1307, Issue 1

[Wcwinslow at aol.com]

Having built a number of wooden boats, including a 19' cat boat, I would  
like to make some observations about wood laminations as it might impact  the 
ongoing discussion about replacing mast beams. In general, a laminated beam  is 
stronger than a solid wood one. In days of yore, the frames of many wooden  
boats were steam bent from solid oak. But the trend today is to make laminated  
beans. They are stronger and less apt to break. The wooden mine sweepers still  
made in Wisconsin use giant laminated ribs. With this in mind I turn my  
attention to A30 mast beams. A well crafted laminated beam should last for  20-30 
years. The secret is the kind of wood you use more than the epoxy. Oak is  
tricky because it doesn't always mate well with epoxy (T-88 seems to work as  
well as any). On my cat boat the stem is three pieces of oak through bolted and  
epoxied. It needed a little rejuvenation after 13 years. I would recommend 
1/4"  strips of a mixture of hickory or ash with mahogany. My cat boat tiller is 
a  compound curve of those materials and after 15 years is as solid as a   
rock.
 
 
In a message dated 7/19/2008 6:09:23 P.M. Eastern Daylight Time,  
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