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@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
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