Not that I know of. I've never seen any deflection spec on the AN
Wireless website, nor in the documentation I got for the tower. I
bought the HD-70 model, though, and it is rated at 62 sq ft at 70 mph
(28 sq ft at 80 mph) so it is pretty sturdy. I generally don't place
much faith in eHam product reviews, but there are some comments there
from experienced tower installers who say it feels solid under their
feet even in a stiff wind.
The combined wind loading of the antennas I plan to install on the tower
is less than 25 sq ft, but they will be on a mast of course and I have
personally measured wind gusts here on this mountain hillside in excess
of 80 mph so I decided to be cautious when I chose the tower.
73,
Dave AB7E
Jim Lux wrote:
> David Gilbert wrote:
>
>> Hi, Pete.
>>
>> I'm kind of sorry I even wrote my post now for the confusion it has
>> apparently created, but just to clarify ... I was putting up a 70 foot
>> AN Wireless self-supporting tower (model HD-70). It's basically a
>> heavier version of the popular Trylon towers, and both have the same
>> issue. You encase the base in concrete before you ever add the rest of
>> the tower, and the eventual "plumbness" of the finished tower is a
>> function almost solely of how accurately you plumb the relatively short
>> base (five feet in my case) before the concrete is poured. My tower
>> tapers from 48 inches on a face at the base to about 22 inches at the
>> top, which calculates out to a leg angle right at 89.0 degrees. Every
>> 0.1 degree of error therefore gives about two inches of offset at the
>> top, and obviously anything beyond a full degree of error (pretty easy
>> to get with many alternate methods) would put, in my case, a 2,000 pound
>> tower partially leaning out over one of the legs ... with no guy wires
>> to help support it.
>>
>
>
> Out of curiosity, does the spec sheet or engineering drawings say how
> much deflection of the top one would expect at rated wind load? It
> might actually be more than a few inches. I've been at the top of some
> unguyed poles in the 50-100 ft range, and it's seemed to me that they
> swayed a fair amount.
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