: Hi Pete,

: I think that there are two different things here.

: One is the basic strength of the component - in this case the grain
: orientation in the wood. The second is wood/fiberglass composite
: construction of a kayak hull where there is more than one factor to
: consider.

: In simple form [like a bow limb] the material IS the structure and the only
: strength is that of the material. Strength can be tested with relatively
: simple approaches.

: In a composite construction, the strength is derived from the materials AND
: the form. Both have to be considered together, testing is more complex.
: For example, a plain sheet of paper will not support its own weight when
: flat - fold it, open the sheet to form a 90 degree angle and the sheet of
: paper can easily support its own weight.

: This is where I was comming from with my post. I just kinda junped in with my
: comments - if I missed the jist of your question - sorry for the
: confusion.

: Hank

Hank,

You have introduced an important point here. The shape factor must be taken into consideration when describing the strength of a structure. Simple mechanical tests like three-point bending or simple tension allow us to obtain material properties that can be used in calculations which include shape factors.

Sam