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Originally Posted by GenKreton
I would suspect you were operating you modifications too near their natural frequency. Even if you merely pass through, components with a low fatigue life, such as aluminum, will break eventually unless you use a high safety factor in your design. For a simple beam the calculations are trivial but on something like a nose cone you are best left to testing it. In some applications you can pass through multiple resonating frequencies - we often encounter this in turbomachine design. If yu want to investigate attach some accelerometers to oscilloscopes and read them as you drive. If you notice peaks in the cycles, you have a problem.
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GenKreton,I think your right on the money.These were the beginning of what was to be heavier structures,however,while in their embryonic stage,lacked the wall thickness to stand up to air induced perterbations encountered and the havoc they played with these thin shells.When reproduced and laminated to their final thickness,while a bit heavier,they were nevertheless robust enough to survive the rigors of the road and thunderstorm wind spectra that we can experience here in Texas and the desert Southwest.It would be great to instrument everything.What an education that would be.Thanks for the input!