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## Re: [TowerTalk] wind load

 To: "'Tower and HF antenna construction topics.'" Re: [TowerTalk] wind load "Mike" "Tower and HF antenna construction topics." Thu, 18 Feb 2010 20:29:25 -0800 mailto:towertalk@contesting.com>
 ```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@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@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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