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Re: [TowerTalk] wind load

To: "Tower and HF antenna construction topics." <towertalk@contesting.com>, "'Tower and HF antenna construction topics.'" <towertalk@contesting.com>
Subject: Re: [TowerTalk] wind load
From: yetiguy@earthlink.net
Reply-to: yetiguy@earthlink.net, "Tower and HF antenna construction topics." <towertalk@contesting.com>
Date: Sat, 20 Feb 2010 14:49:14 -0500 (EST)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
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@sbcglobal.net>
>Sent: Feb 18, 2010 11:29 PM
>To: "'Tower and HF antenna construction topics.'" <towertalk@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
>
>
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