[TowerTalk] wind load

[Pat Thurman]

Hi Dennis,

It's available at IHS/Global.  Be ready to choke when you see the price.
http://tinyurl.com/ykwcbre

73, Pat K7KR



----- Original Message ----- 
From: <yetiguy at earthlink.net>
To: "Tower and HF antenna construction topics." <towertalk at contesting.com>; 
"'Tower and HF antenna construction topics.'" <towertalk at contesting.com>
Sent: Saturday, February 20, 2010 12:49
Subject: Re: [TowerTalk] wind load


>
> Where can one order a copy of EIA RS-222-G?  The Electronic Industries 
> Association seems to have evaporated.  Then, I checked the ANSI site 
> eStore for this spec with no joy. Not even a reference.
>
> Dennis, K6IFB
>
> -----Original Message-----
>>From: Mike <noddy1211 at sbcglobal.net>
>>Sent: Feb 18, 2010 11:29 PM
>>To: "'Tower and HF antenna construction topics.'" 
>><towertalk at contesting.com>
>>Subject: Re: [TowerTalk] wind load
>>
>>WIND LOADING: Engineering analysis indicates the tower will support 23
>>square feet of projected area at 85 MPH 3 second gust wind speed per
>>ANSI/TIA EIA RS
>>222 Rev. G.
>>
>>Does not matter what you think or feel, all that matters to the local city
>>these days is the example above.
>>
>>Mike
>>
>>-----Original Message-----
>>
>>
>>Hi Rex et al
>>
>>Yeah, but for how long?
>>
>>I've always wondered if that is a sustained 70 mph wind for 5 hours or a
>>gust or 2 at that speed.  73
>>Tom W7WHY
>>
>>
>>
>>
>>I believe it's saying that at 70MPH, the tower will support 15 sqft of
>>antenna/mast/whatever is put on it.  Most antennas will specify effective
>>"wind load" in square feet of "projected area."
>>
>>      -Rex-
>>
>>     K1HI
>>Rex Lint
>>  Merrimack, NH
>>
>>
>>I've been looking at various tower specifications, and often see
>>something like this
>>
>>Maximum Wind Load
>>70 MPH 15 sq. ft.
>>
>>I don't really understand how to interpret this.  I think a wind load
>>is a (static) force, and therefore should be measured in either
>>newtons or pounds.  IIUC, it should be proportional to the square of
>>the wind speed and that the constant of proportionality should itself
>>be proportional to the cross-sectional area to the wind.  So 15 sq ft
>>is an area, and 70 MPH is a wind speed, but I'm still missing some
>>factors in order to calculate a force.
>>
>>Can anyone shed some light?
>>
>>73s
>>
>>
>>_______________________________________________
>>
>>
>>
>>_______________________________________________
>>TowerTalk mailing list
>>TowerTalk at contesting.com
>>http://lists.contesting.com/mailman/listinfo/towertalk
>>No virus found in this incoming message.
>>Checked by AVG - www.avg.com
>>Version: 8.5.435 / Virus Database: 271.1.1/2689 - Release Date: 02/18/10
>>19:34:00
>>
>>_______________________________________________
>>
>>
>>
>>_______________________________________________
>>TowerTalk mailing list
>>TowerTalk at contesting.com
>>http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>