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Old 06-09-2022, 06:56 PM   #3 (permalink)
aerohead
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rigid shape

The 'big-boys' call it aeroelasticity.
Forces acting on an under-engineered profile can actually deform it into a lifting panel, which subsequently rises to an angle of attack aggressive enough to get to burble point, then stall. The panel falls below the critical angle which initiated lift, and the 'system' begins the lift/stall cycle all over again, leading to the cyclic deformation known as 'flutter', which can bring an aircraft down.
Depending on the material, the degree of deformation, and the natural frequency, or harmonics of that frequency, the panel will just self-destruct.
There are YouTubes of model, Lockheed C-130 Hercules coming apart in a wind tunnel.
The easiest solution, yet the most difficult to fabricate, are 'compound' surfaces, where they curve in three axes. Like a hen's egg. The strongest and lightest structures have compound surfaces .
Most contemporary automobiles have some degree of compounding to their sheet metal. Strong and light!
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