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
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?
https://cdn.shopify.com/s/files/1/0152/1643/products/w4gv4vs2-1415582971_
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.
++
Pretty sure the KR-2 construction manual specifies vertical grain
orientation for the spar shear webs.
Chris K
On 10/27/2021 7:48 AM, Sid Wood wrote:
To salvage your original spar with the miss-oriented web, plane it
off. One or two passes with a bench power planer would do it in a
couple
In any I beam, such as the KR-2 box spar, any G load tends to move the spar
caps closer together. The function of the webs is to resist that movement
to prevent the collapse of the spar. The strongest direction for lumber is
in the direction of the grain, either in compression or tension. In
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