[TowerTalk] Tower Mast Wind Loading

[John Santillo]

Hello,

 

I've volunteered to help out a friend of mine with a mast length vs. wind
loading question.

 

If I have a 2" diameter Chromoly Steel mast with a 0.25" wall thickness that
is 16 feet long (4 feet nested in the tower) sitting on top a HDX-555 tower,
how "safe" are we from this mast folding over with the following antennas
mounted to the mast at 80MPH?

 

Antenna #1 will be 1 foot above the thrust bearing and is 5.5 FT2

 

Antenna #2 will be 6 feet above the thrust bearing and is 2.9 FT2

 

Antenna #3 will be 10 feet above the thrust bearing and is 1.21 FT2

 

Antenna #4 will be 12 foot above the thrust bearing and is 0.42 FT2

 

 

Thanks for any help you can provide.

 

 

73,

 

John

N2HMM