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We could set up a balance test with tails on the cups, even though spinning would not work with them. I'm sure the results would be similar. It would be nice if air would just stagnate and pile up as if an ice cream cone had been given one scoop, but the air in a cup or any similar leading shape is unstable, and keeps spilling out one way or another, pushing the streamlines out farther than they would go with a conventional rounded nose. On a belly pan, a quick squirt of caulking foam might help many situations.
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