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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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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