Anyone building airplanes with plywood owes it to themselves to go to
everyspec.com and download MIL-P-6070B, as well as the latest version
which supercedes it, MIL-DTL-6070C. Small knots and other defects are
permissible in aircraft plywood but under a certain size and only at a
given frequency within a given area as defined in the spec. You have to
inspect the wood in your possession and do the math. It's entirely
possible to get a pallet of 4'x8' sheets with no defects and then order
one sheet that has visible knots yet within spec ( one would hope).
Chris K
On 10/27/2021 2:42 PM, Flesner wrote:
On 10/27/2021 3:24 PM, Flesner wrote:
I don't ever recall seeing aircraft grade ply with circular grain and
evidence of knot patterns.
++++++++++++++++++++++++++++++++++++++++++++++++++
Shouldn't it look more like this?
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