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Re: [TowerTalk] wind load

 To: "'Tower and HF antenna construction topics.'" Re: [TowerTalk] wind load "Ken Kinyon" w7ts@comcast.net, "Tower and HF antenna construction topics." Thu, 18 Feb 2010 11:40:47 -0700 mailto:towertalk@contesting.com>
 ```Hi Charles, I think they state it that way because the average guy wouldn't understand what you just said. ;<) It is my understanding that the max force would be the force generated by a 70 mph wind blowing on a 15 sq foot surface. I guess at the top of the tower. To be picky that would vary with altitude, humidity, and barometer pressure. Since most antenna manufacturers quote a square foot wind load for their antennas, this give a quick and dirty method of judging if your tower can take a particular antenna. 73, Ken W7TS > -----Original Message----- > From: towertalk-bounces@contesting.com [mailto:towertalk- > bounces@contesting.com] On Behalf Of Charles Coldwell > Sent: Thursday, February 18, 2010 11:16 > To: towertalk@contesting.com > Subject: [TowerTalk] wind load > > 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 > > -- > Charles M. Coldwell, W1CMC > "Turn on, log in, tune out" > Winchester, Massachusetts, New England (FN42kk) > > GPG ID: 852E052F > GPG FPR: 77E5 2B51 4907 F08A 7E92 DE80 AFA9 9A8F 852E 052F > _______________________________________________ > > > > _______________________________________________ > TowerTalk mailing list > TowerTalk@contesting.com > http://lists.contesting.com/mailman/listinfo/towertalk _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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