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Old 11-09-2007 | 05:31 PM
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Sportflyr
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Default RE: gp lancair wings snapping

ORIGINAL: jrf

Ahhh... Sportflyer:

The grain is supposed to run up and down. The purpose of the shear web is to keep the spars from coming together. The stress on the webs is diagonal and it shifts 90 degrees when the wing goes from positive to negative G. The best compromise, to align the grain with the direction of the average stress, is to put the grain vertical.

Jim

Makes sense but, having not built for a while, that was
one of the first things that came to mind AND an old timer
at the field wondered why the grain was running "the wrong way" but,
I'm sure there are arguments supporting his theories too.
I tend not to argue with veterans in the sport and now that you explained
it so clearly, I can definitely see benefits of running the grain vertically...

Thanks for the clarification![8D]
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