Flutterings flutterings?

Waving US flag

"Fluttering" vis-à-vis "waving".

Why do flags flutter? Believe it or not, we wondered about this.

Come to find out, some engineering-type geeks got to puzzling this same issue a couple of years ago. Seems it comes down to something to do with “velocity differentials” or something like that. Amazing amount of chatter from these fellows about something that seems so simple. Guess it’s not. I always thought flags waved just to say, “Hi!”

The cool image above is courtesy of 3D Flags. They asked us to say that.

The geeks’ flutter chatter can be found at Eng-Tips forum. I’m not sure if they care if we credit them: it just seems like a nice thing to do.

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