[TowerTalk] Tower Mast Wind Loading

[TexasRF at aol.com]

John, assuming a mast material yield strength of 110,000 psi the system  
described will survive 161 mph peak winds. The antennas will be stripped away  
well before reaching that wind speed so the mast survival wind speed would 
be  much higher than that. 
 
This is based on RS222 rev F criteria, rev G would show an even higher wind 
 survival. The mast is not the limiting factor by in this case.
 
73,
Gerald K5GW
 
 
 
 
In a message dated 7/5/2016 7:50:06 P.M. Central Daylight Time,  
u1004467 at warwick.net writes:

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  





_______________________________________________



_______________________________________________
TowerTalk  mailing  list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk