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Originally Posted by
I have heard talk about that under stress testing of airplanes (eg. big
Boing machines), they bend the wings so much that they touch each
otherover the airplane?
Has anybody seen such photos, or is this just a lie?
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Not a lie that they perform this test, although as previously pointed out, the spar fails long before the wing-tips meet. I remember seeing a PBS/History/Discover channel program about the initial production of the B777. They had impressive footage of the destructive load testing of the wings. IIRC they failed at a 40-something degree deflection.
I've have also seen footage on the web site of one of the German sailplane manufacturers (A. Schleicher, Schempp-Hirth, or Glaser Dirks, perhaps) of the destructive test of a new wing design with a carbon fiber spar. That was very impressive and violent.
V7