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## [TowerTalk] Antenna surface area

 To: [TowerTalk] Antenna surface area n3rr@erols.com (Bill Hider) Sun, 10 Jun 2001 03:11:48 +0100
 ```No Stu, it wouldn't be precise. It would be the integral, as I stated. Your formula would result in a surface area exposed to the wind much larger than even Gene's calculation (especially, if his is reduced for 1/2 of the tube facing the wind), when in fact, it's actually less. Take a look at what you said: 0.5 x Pi x D. Well Pi x 0.5 = approx. 1.55. If you multiply 1.55 x the diameter times the length, that's *much* more than Gene's original calculation!!! It is the Integral over the complete half of the diameter. Not a simple calculation - it requires a computer. As far as taking 1/2 of each of the elements and the boom, it all depends on your definition of *wind area*. Just define it, and you're fine. So, your definition is fine with me, as is mine. Whatever definition the mfgr uses, it is Ok with me, as long as we all know what they use. If you use the larger of the two, that will be larger than the sum of 1/2 of each, so it's a bit more conservative. That's why I use it. Bill ----- Original Message ----- From: Stu Greene To: Bill Hider ; Sent: Sunday, June 10, 2001 3:50 AM Subject: Re: [TowerTalk] Antenna surface area > At 02:13 AM 6/10/01 +0100, you wrote: > >The formula Gene proposed is not exactly correct, nor does he precisely > >state what to do with the taper. > Following your reasoning, would A = 1/2 [L X (pi X D)] be close > enough? That does not account for taper, but it is half the circumference > of the element times its length. > > You added > > > but the wind cannot be simultaneously hitting the elements at 90 Deg and > > the boom at 90 Deg, so it should take that into account by specifying the > > *larger* of both calculations, but not the sum of both > > Bill, irrespective of the wind direction which can change momentarily, > surface area is surface area, so that an accurate measurement should be the > sum of half the boom area plus half the element area. > > I wonder if antenna manufacturers, when calculating wind area and > advertising it, do it your way or mine or perhaps something a bit more > arcane. I'm sure that someone will straighten out the error in my logic. > > 73 Stu > > > List Sponsor: Are you thinking about installing a tower this summer? Call us > for information on our fabulous Trylon Titan self-supporting towers - up to > 96-feet for less than \$2000! at 888-833-3104 > www.ChampionRadio.com > > ----- > FAQ on WWW: http://www.contesting.com/FAQ/towertalk > Submissions: towertalk@contesting.com > Administrative requests: towertalk-REQUEST@contesting.com > Problems: owner-towertalk@contesting.com > > List Sponsor: Are you thinking about installing a tower this summer? Call us for information on our fabulous Trylon Titan self-supporting towers - up to 96-feet for less than \$2000! at 888-833-3104 www.ChampionRadio.com ----- FAQ on WWW: http://www.contesting.com/FAQ/towertalk Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com ```
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