The "tumbling" rule
Experience shows that any non perfectly
spherical balloon in fly, in real conditions, will tumble. The physical
arguments explaining that are very simple and are exactly the same used to
explain why any tether in a balloon in fly in real conditions will always have
an oscillating/undulating motion: No air current is perfectly uniform, there
are always small irregularities in it, that means that the air current action
or effect on the non perfectly symmetric surface will be different in different
sections creating a disequilibrium that lead to tumbling.
Then if we observe a non perfectly spherical
balloon that consistently is keeping exactly the same "position"
without any tumbling then that object is behaving in an anomalous form.
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