With either method, those who never tested balsa before will be suprised
at the wide varience. It is essential to test spars for wood on EZB and
unbraced F1D. It can make your models much more consistent!
Don
> --- In Indoor_Construction_at_yahoogroups.com, Don Slusarczyk
> <don5490_at_s...> wrote:
> >
> > I mean the weight of the sheet causes too much delfection. 1 sheet of
> > .020 thick by 1" wide by 18 " will significanylt deflect due to its
> > own weight. You can not apply any weight to it or it will break.
>
> In that case I would shorten the spacing between the end supports
> until the self-sag is acceptable. It doesn't take much reduction in
> the spacing to greatly reduce the self-sag.
>
> You are then measuring the stiffness of only the wood that's between
> the supports, but that seems OK to characterize the whole length of
> the sheet. Variation across the grain is another matter, of course.
>
>
>
>
>
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Received on Sat Jan 14 2006 - 11:20:20 CET