On 10/26/2021 9:36 AM, costewart23 wrote:
I think I messed up and have to redo the birch ply on the spars, I scarfed the
ply 12:1, but ran the grain horizontal instead of vertical one side of the
main and outer fwd spars before I closed them up.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I don't ever recall seeing aircraft grade ply with circular grain and
evidence of knot patterns. You mentioned in a private post that it was
"aircraft grade" from Wicks. Am I the only one that sees this a
questionable?
Here is a good article on wings.
https://www.kitplanes.com/spars-the-heart-of-the-wing/
in the article
https://s28490.pcdn.co/wp-content/uploads/2019/05/spars_09a.jpg
It would seem to me the force on the web is more in shear or tension
than compression as evidenced in the photo. The web appears "pulled
apart", not compressed.
http://www.krnet.org/mvn2008/080921265.jpg
http://www.krnet.org/mvn2008/080921282.jpg
What am I missing?
Larry Flesner
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