"Corrugated" will be your search word - have fun...,
This picture is worth more than words - the "Tin Donkey" tail is exemplary of corrugation experiments though at this point it still remains unexplained. Reason? It belongs in the "magic" category of modeling that is beyond what most modelers can achieve and therefore can't be stolen over the internet - or something that has high affinity to that nature...,
Some vague and ambiguous regards,
-Gil
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