[TowerTalk] Wind survival + load ratings... vs,

[Kurt Andress]

I'm with you Jim!
Maybe a poor choice of phenomenon description, but that was how Weber 
saw it......
And, he was the first one to step outside the box and tell everyone they 
were doing it all wrong!
Kinda like me for the past couple of decades.....
His analyses, methods, and formulas are all correct and produce 
technically sound results for those that chose to try to work with the 
real matters at hand!
Regardless of his choice of terms, I tip my hat to him to have the balls 
to go out there and tell everyone in the Amateur Antenna World, they 
didn't know what they were doing!
The problem was that most reading it, didn't have enough ME knowledge to 
understand it and change their methods to try to get it right!
Not much is different today........
Thank you for your thoughts! 73, Kurt, K7NV

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Message: 4
Date: Thu, 2 Nov 2017 10:12:03 -0700
From: JVarney<jvarn359 at gmail.com>
To:towertalk at contesting.com
Subject: Re: [TowerTalk] Wind survival + load ratings... vs,
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Kurt Andress<andresskurt at gmail.com>  wrote: "papers from
~20 years ago as he explained his 'crosswind principle'."


Sigh, I wish he had used a different terminology.  It's purely semantics
but I think the phrase "crosswind principle" is misleading.

It's a fictitious force that does not exist in reality. If you have a 50
mph
wind out of the north, there is no magic crosswind that appears out of
the east or west that pushes on an antenna element.

It's similar to the centrifugal force that wants to push you
out of your car when you go around a turn. It's just inertia
and your body's frame of reference that creates an apparent
force. Same thing with an aluminum tube facing the wind at
an angle, the reaction force is perpendicular to the tube
at an angle to the wind. For mathematical convenience you can
resolve the reaction force into two components, one parallel to
the wind and the other at right angles to the wind, but that's
only a paper construct, there is no crosswind blowing.

Personally I prefer the phrase "wind reaction principle" to
describe what occurs. I recall the first time I read K5IU's
paper my reaction was "Crosswind? What crosswind?"

73 Jim K6OK


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