[Boatanchors] Guy Wire Insulator Placement

[Kenneth Grimm]

You really should have a look at the Heights aluminum towers.  Normal
towers are rated at 70-90 mph.  I asked for a little more conservative
design and Drake was able to provide me with a 100-110 mph  72 ft fold over
self supporting aluminum tower that holds my 4 element SteppIR and a Force
12 240/230 Delta.  Last year with a derecho blowing through here at 80 mph
plus speeds, the tower didn't move...although the SteppIR elements looked
quite bowed for a while!!!  Heights provides engineering info on their web
site.  I don't recall any mention of anything as puny as being rated at 50
mph.

73,

Ken - K4XL

On Thu, Jul 25, 2013 at 4:45 PM, Jim Wilhite <w5jo at brightok.net> wrote:

> Every aluminum tower specification I have seen uses 50 mph for their wind
> load design point.  The older steel designs used 75 or 90 mph.  That would
> make a big difference especially when we hams tend to overload a tower up
> on top.
>
> Jim
> W5JO
>
>
> ----- Original Message -----
>
>
>  What I am using is personal experience. In each case where I know of
>> problems with an aluminum tower, the tower was installed using the
>> manufacturer's recommended procedures. In each case the wind load on the
>> tower was less than the maximum rating of the tower. In each case, the
>> tower "buckled" at about the half-way point. That is, there were no
>> problems with the base installation.
>>
>> These towers were installed in north Texas (Dallas, Texas, area) where
>> the wind speed does, on occasion, get above 70 mph. In fact, every few
>> years, the wind speed can go over 90 mph. These are "straight line" winds
>> and not tornadoes. A tornado, of course, is a completely different matter.
>>
>> Obviously, there are different manufacturers of aluminum towers and,
>> probably, different specifications that must be met in different countries.
>> As such, I have no idea as to if the aluminum towers sold in Australia are
>> the same as those that were sold in this area. But, I do stand on my
>> comments based on my experiences.
>>
>> In my professional experience as a telecommunications consultant, I have
>> had quite a number of towers installed from less than 100-feet to over
>> 500-feet. As such, I do believe that I do have at least a "little"
>> experience with different tower types. Those towers ranged from guyed to
>> self-supporting and I would never recommend using an aluminum tower!
>>
>> Glen, K9STH
>>
>>
>>
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-- 
Ken - K4XL
BoatAnchor Manual Archive
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