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Wolfgang: The doped linen fabric is subjected to tremendous suction forces which over a period of flights gradually separates the fabric which is glued to the airfoil from its attachment points. Once the wind gets under this fabric it completely separates it from the airfoil. The airfoils, if not correctly braced, will flex or torque wooden members, and so help to separate the fabric as the dried glue fragments. Bullet holes in the fabric, and slugs which sever the bracing wires will also set this failure node up. Putting a 20G force on a 10G wing does it every time.
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