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"No visible flutter was observed, but that doesn't say that it couldn't,"
And a big reason I suspect was one side was a restricted confined space on one side that likely dampens the flexible material. Same applies to Billboards, and soft side semi trailers. The example previously discussed here on the bottom of a semi-trailer had no confined air volume on one side and was relatively open to aero forces on both sides, but I am now repeating myself.
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