[Public-List] Mast beam in newer boats

[George Dinwiddie]

Richard J Hughes wrote:
> If available . please tell when Whitby started using an I-beam vs 
> laminate. I recently bought # 438 (1970) which has headliner to hide the 
> main beam, but I think there may be issues, due to visable bubbling in 
> the aft side of the main beam liner, but no moisture if I stick a drill 
> into it.

Richard, as far as I know, the aluminum beam started with the liner 
boats.  On these boats, the problem is not that the beam deflects, but 
that the liner forming the cabin sole (on which the bulkheads rest) 
deflects.

  - George

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