Lee, is it aluminum? John
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> From: Lee Wells <leewells@lexmark.com>
> To: towertalk@contesting.com
> Subject: [TowerTalk] Mast bending
To: <towertalk@contesting.com>
> Date: Saturday, September 20, 1997 8:23 PM
>
>
> Hey guys....I'm getting ready to put the antennas on the mast
> of my new tower and noticed that the mast seems to have
> a lot of "give" or a "springy" feel. The mast is a little
> over 23 feet long. I've got about 4 feet out the top
> of the tower, thrust blocks at the top of the tower and down
> 3 feet, then the mast goes through the rotor plate (8 ft
> down from the tower top). So I've got about 11 feet hanging
> below the rotor plate and if I push on the bottom, I can
> move the mast 4-5 inches off center.
>
> I used MARC to determine that I needed a mast with 50,000
> psi and .188" wall. When I orderd the steel tubing
> I went on up to .25" wall, and the tubing is supposed to
> have a yield strength of 58,000 psi.
>
> I'm definetly going to check with the supplier on Monday
> to verify the specs of the tubing.
>
> What I want to know from Towertalkians is how much
> play or spring should I expect????? Is this normal?
> This is my first tower so I simply don't know
> what to expect on this.
>
> I was hoping to get everything finished this weekend,
> but I want to double check on this before I
> mount the first antenna and run the mast the rest
> of the way up.
>
> Thanks & 73's
> --Lee
>
>
> ---
> Lee Wells - KT4ZX
> leewells@lexmark.com
> Georgetown, KY
>
> --
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