[TowerTalk] RE: Tower Wind Calcs

[Richard M. Gillingham]

Who puts a wet stamp on building proposals for all those trees??  They blow
down all the time.  Who approves those permits?

Just a thought..

I thought a thought,
but the thought I thought
was not the thought
I thought I thought.

I think, therefore I am confused..

Happy 'antenna support structures' everybody.

Merry Christmas, Happy Chanukah, Quanzaa or whatever else one may celebrate
this time of year.

Gil, W1RG  (non o' that wishy washy Happy Holidays stuff for me)
----- Original Message ----- 
From: "Jim Lux" <jimlux at earthlink.net>
To: "W7AOR" <w7aor at narri.org>; "Alan C. Zack" <k7acz at cox.net>;
<TowerTalk at contesting.com>
Sent: Friday, December 12, 2003 10:20 AM
Subject: Re: [TowerTalk] RE: Tower Wind Calcs


> It may not even be possible to have any antenna area at 90..
> The allowed cross sectional area is dropping faster than windspeed
squared..
> There's something else at work than simple canteliever loads here.
> 16.5 sq ft @ 50 mi/hr => 106 pounds
> 6.8 sq ft @ 70 mi/hr => 85 pounds
> Continuing the trend... at 90 mi/hr, even as small as 3 square feet,
you're
> at 62 pounds
> Something like a Ringo Ranger probably has a cross sectional area of 3
> square feet...
> I'll bet the screwdriver antenna on my car has a cross sectional area of 3
> square feet..
>
> ----- Original Message -----
> From: "W7AOR" <w7aor at narri.org>
> To: "Alan C. Zack" <k7acz at cox.net>; <TowerTalk at contesting.com>
> Cc: "Las Vegas Radio Club" <lvrac at yahoogroups.com>; <reginfo at arrl.org>;
> "Antennas" <antennas at mailman.qth.net>
> Sent: Thursday, December 11, 2003 3:41 PM
> Subject: [TowerTalk] RE: Tower Wind Calcs
>
>
> > Nevada P.E. wet stamp on docs for $250. Take it. That is cheap. No PE
> local
> > could do that.
> >
> > Interesting that Henderson is asking for 90 mph. I thought that one
could
> > just put up a tower in Henderson with the city being interested. Clark
> > County asks for 70 mph.
> >
> > Beware that the original calcs for US Towers MA-40 is done at 50 MPH
> > Winds -- 16.5 sq feet; 85 lbs and at 70 MPH Winds -- 6.8 sq. feet; 65
lbs.
> > so at 90 mph what do you think happens to allowed antenna loading and
> > weight?
> >
> > Good luck!
> > Kent W7AOR
> > www.narri.org
> >
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
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