Posted by Ken Macfarlane on December 17, 2016 at 04:50:06 from (104.249.226.173):
In Reply to: Re: Strangest thing posted by rrlund on December 16, 2016 at 17:30:17:
That's a hint right there, a 16 ft span is very flexible and what we call dead still air usually still has a velocity to it.
If you look at round cylinders in a wind they shed vortices behind them alternating side to side which is why wires etc sing or hum in a breeze. To be visibly shaking the wind speed likely just happened to line up with the natural frequency of the pipe.
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