[Public-List] Mast beam almost finished!

[Gordon Laco]

Perhaps to provide a second line of security to the glue in the laminations?   Just guessing, Surprise is a liner boat so we don't have the wooden beam.  

Gord 

On 2013-10-26, at 10:22 AM, Glenn <brooks.glenn at comcast.net> wrote:

> Gord, any idea why Whitby put the thu bolts in the beam in the first place?
> 
> Gpb
> 
> Sent from my iPad
> 
> On Oct 26, 2013, at 5:00 PM, Gordon Laco <mainstay at csolve.net> wrote:
> 
>> Hi guys
>> 
>> Side forces on the heel of the mast are zero.   The geometry of the rigging turns it all into compression.  And if the rigging let go, for whatever reason, there'd still be zero side force at the mast step because the mast would fall to leeward, pivoting on its heel.  (Unless that cross-wise bolt is in place, in which circumstance the mast would tear up the step plate and what cabin top it managed to keep hold of) 
>> 
>> With that cheery image placed in everyone's minds, I'll say good morning to all of you!
>> 
>> Gord #426 Surprise
>> 
>> 
>> On 2013-10-26, at 9:11 AM, Jeffrey <fongemie at gmail.com> wrote:
>> 
>>> Thanks Glen.
>>> 
>>> You are probably right about using the through bolts.  I'm still
>>> trying to get my head around the forces on the last plate. Obviously
>>> down. But then I'm sure there's some pushing to the side, depending on
>>> the tack.  What I'm thinking is that the bolts holding down the mast
>>> plate only need to resist force in sheer, so that depth wouldn't
>>> matter after a certain point.  Shorter lag bolts that are thicker
>>> might be stronger than thinner through - bolts?
>>> 
>>> 
>>> jeff
>>> 
>>> Jeffrey Fongemie
>>> 
>>> Seagrass
>>> Alberg 30 #116
>>> Boothbay Harbor Maine
>>> 
>>> 
>>> 

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