27531Re: [bolger] Re: PL Experience
- May 4, 2003Well said! This should be pinned to the boat shed wall and frequently re read! If you can swim and the water is warm [and shallow!] then a cardboard boat glued with fish paste makes sense.........however,far out at sea on a falling glass you may wish you had chosen something else............Andy
proaconstrictor <proaconstrictor@...> wrote:"What more does glue have to do but out last the materials it's
I don't find this report particularly surprising, any construction
adhesive would have done the same, unless water was a big issue.
Basicaly the expectation of a good glue is that the wood breaks
before the glue. I think fish paste would do this. Big deal.
In your situation, the structural issue I imagine would be whether
the seats play an essential part in the overall structure of the
boat. In some boats the furniture is an essential element in the
strength of the boat. On the other hand if it is just holding itself
up like a gloryfied love seat then construction grade materials with
maintenance characteristics you feel comfortible with should be fine.
Where the joint is structural, destruction tests aren't always
adequate. The forces applied to the boat are long term. A bulkhead's
ability to resist over years is completely different than it's
ability to resist a blow from a hammer.
Also, when one takes something apart of course one tries to pry
pieces apart along their lines of greatest weakness, for instance
spliting the plywood around the glue. But when aligning the materials
to bear loads its the opposite, you try to place them so they will
take the biggest loads possible. Wood splits esily, and the loads
you applied split with the grain. Good structure aligns loads with
wood's strengths, endgrain compresion, and in line with the grain.
One tries to distribute loads as broadly as possible, and where
possible as shear loads to the glue joints. If these loads are
significant and persistant, they will severely test the glue in the
Take a hurricane clip, or any similar little piece of Strongtie
metal. You can get your claw in under that and pull it off easily.
You might say, "it pulled ou real easy, why not use non-code nails,
or plastic ones, they could hardly pull out any easier". But the
clips are loaded tranverse to the nail, and how easily the nail pulls
out is irrelevant, how easily the heads shear off matters a lot.
None of this has anything to do with your specific application. It
could be quite strong enough. I just don't draw the same conclusion
you do about what tearing the boat apart means relative to the
performance of materials.
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