Brian Whatcott wrote:

A striking comment in a wonderful book on engineering design disasters
mentioned casually that the proof load on a particular aluminum airliner
wing would bend it to the vertical at the tips [if buckling did not
occur long before....]
Perhaps you were too hasty to scrub the project?? I have looked out the
window in bumpy conditions to see wingtips flapping a yard or two....

Brian W


I've seen them do that in a 747.