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[Towertalk] Estimation of yagi windload

 To: [Towertalk] Estimation of yagi windload K4JA Paul"
 ```Hello All Anyone wishing to do serious yagi Windload work should consider yagi stress. It answers all the questions. http://yagistress.freeyellow.com/ I use it in all my home built yagies. GL Paul K4JA ----- Original Message ----- From: "jljarvis" To: Sent: Saturday, 06 July, 2002 14:02 Subject: [Towertalk] Estimation of yagi windload > > Towertalkians: > > In thinking about Eric's question of windload on a helix, > I came to realize I'd never seen a thorough approach to > windload on a yagi. > > * Does anyone have a reference to a published analysis? > > * Thinking about it: > > * To what degree are 'hidden' elements shadowed by > those before them? It probably depends on windspeed > and element diameter, as well as spacing. > > * My guess is, "not at all", in which case, one sums > the exposed area of the elements and degrades that by > whatever the flat/round factor is. (.70?) > > * Further, I suspect that maximum exposed area occurs > around 45 degrees, where one takes .707 of the exposed > boom area, plus .707 of the exposed elements area, > each multiplied by the flat/round factor, and then summed. > > > I suspect a search in the IEEE journal might yield something; > that's my next step. > > Has anyone seen reference to wind tunnel studies, in support > of mathematical models/approximations? > > Jim Jarvis/N2EA > > > > > _______________________________________________ > Self Supporting Towers, Wireless Weather Stations, see web site: http://www.mscomputer.com > Call 888-333-9041 to place your order, mention you saw this ad and take an additional 5 percent off > any weather station price. > _______________________________________________ > Towertalk mailing list > Towertalk@contesting.com > http://lists.contesting.com/mailman/listinfo/towertalk > ```
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