Static Wing Load Testing of Old Wooden Glider Wings
I do not think there is any way to perform a meaningful non destructive load test on potentially airworthy wings.
Several years ago I refinished an shk-1, and used tap testing, harmonic frequency evaluation, I attempted to camera the interior, carefully examining the exterior surfaces. I and My I.A. concluded that the wings were airworthy and I flew it including winch launching.
Best of luck,
Scott
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