The problem statement might be incomplete.
The type of tower was not stated (self-supporting [and type of SS]; or
guyed. If guyed, is the top section guyed at the top?)
Depending, the top section may be overstressed by shear and moment forces.
Bob, W5LT
-----Original Message-----
From: Ed Sawyer [mailto:sawyered@earthlink.net]
Sent: Wednesday, July 06, 2016 7:00 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Tower Mast Wind Loading
I have a 22 ft .25in wall steel molly mast. It is very strong.
I think you are asking the wrong question. With only 4 ft in the tower and
12 ft above, with the torque translated by this very strong based overwhelm
the top of the tower connections - thrust bearing and rotor connection.
The usual rule of thumb is to have 50% of the length in the tower. I have
10 ft of the 22 ft mast in the tower and the top antenna is 9 ft above the
tower. The last 3 ft are for a truss.
Ed
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