56401Re: [bolger] Re: Plywood Again??? Forget Marine Ply!!!
- Jan 5, 2008
> Glassing on the outside adds durability but little strength unless thick and heavy.Strength. There are different types. Bending, compression, shear,
torsional and tensile.
The strength issue with boat hulls is complex and a mix of all these,
but the largest component of strength in hulls is the shell effect
which comes mostly from tensile (and compressive) strength.
Fiberglass has awesome tensile strength properties and good
compressive strength too.
Pull a single fiber strand out of fiberglass cloth and try to break it
with your bare hands to see.
Fiberglass adds much more than just durability, it adds tremendously
to the tensile strength of plywood.
I agree that large ply voids degrade shear, bending and torsional
strength, but I don't see that those are the most important types of
strength with fiberglassed plywood boats.
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