There was no horizontal movement of the base.
The sides of the base to the south and west,
from which the wind normally arrives, had
tilted the tower enough to rotate the base
that inch or two that broke the "pavers".
And it appears at various times the wind was
from all directions as all four sides show
similar vertical movement.
Barry
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Raymond
Benny
Sent: Thursday, May 28, 2020 1:53 PM
To: Barry Merrill <w5gn@mxg.com>
Cc: Tower Talk <TowerTalk@contesting.com>
Subject: Re: [TowerTalk] US Tower 72 ft crank up grinds to a standstill
Barry,
I'm trying to understand what you said about the base moving. What I think I
understand, the concrete base of your tower moved about 2" horizontally and
broke up the pavers at ground level?
If this is the case, wow! In fact, amazing. I've never heard of such a thing
happening. All I can think is that your ground is really soft.
If this is the case, then yes, your tower certainly held up well, in my
mind, beyond its ratings.
Ray,
N6VR/W7YA
On Thu, May 28, 2020, 9:17 AM Barry Merrill <w5gn@mxg.com> wrote:
> "From what I understand, UST rates the 72 foot crank up towers at
> 200 lbs antenna(s), rotor and mast, bearing etc weight with
> 22 lbs of cable weight, 222 lbs max vertical dead weight."
>
> My UST 72 was installed in 2003 with a 9x9x9 concrete base, The tower
> has
>
> OB16-3 Triband 132
> CAL-AV 40 163
> Cable/Rotator 50
> 345 pounds
>
> I did have the tower fully extended a number times early on, lowering
> it for most storms, but several times I misjudged the storm's arrival
> and it took a beating, and then a final time when I was unable to
> lower the tower as it moved in the wind convinced me to give up the
> extended height, and since then it's been about 10 feet extended,
> enough for the Cal-AV to be at 30 feet, (which is still an amazing
> performer, beating locals with stacked 2 el HyGains) and the OB=16-3
> at 50 feet and the tower positioned so the rotator can be removed.
>
> But those several instances of extended with wind have left their
> mark. We had added a pretty stone patio across the top of the base
> and around the base area and now all four sides have broken and appear
> to have moved about 2 inches vertical on each side!
>
> I surely can't complain to UST with my overload!!
>
> 73
>
> Barry, W5GN
>
>
> _______________________________________________
>
>
>
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