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## Re: [TowerTalk] Torque balancing

 To: "TowerTalk" Re: [TowerTalk] Torque balancing "Gene Smar" Sun, 9 Jan 2005 13:18:11 -0500
 ```TT: The articles being discussed (Aerodynamic Balancing Parts 1 and 2 and Cross-flow Principle) are worth the trouble to obtain. I learned quite a bit from them when I read them in 2001. They set my thinking straight regarding air flow over tubular antenna elements, and the resultant effect on wind loading of towers. I got to thinking about developing a demonstration of the principle of cross-flow. The easiest to do (and easy is relative) is simply to fasten a few short, narrow streamers (described further on) to a Yagi's boom and elements. Then observe how they flutter behind the aluminum when exposed to wind. The streamers I'm thinking of are the kind that kids attach to their tricycles' handles, or the tape that has the word CAUTION printed on it. You might even use streamer material that some model rockets use in lieu of parachutes, available from hobby sources. The lighter the material, the lower the wind speed needed to see the effect. If I understand the cross-flow principle correctly, you will see the streamer ALWAYS flutter a right angles to the boom or element, irrespective of the wind direction (as long as the streamer is short enough to stay in the air slipstream behind the element and not dangle several feet below it. Kind of like a tell-tail on a boat sail for you mariners out there.) The net amount of wind force can be seen in how horizontal the streamer is; the closer to horizontal, the greater the effective wind force on the streamer. 73 de Gene Smar AD3F P.S. The articles also got me thinking that I ought not point my mast northward and attach all Yagis from the same side of the tower. Attaching all booms to the east side of the mast for example will increase the torque on the rotator and tower unless the Yagis have each been designed to produce zero torque, or unless you have designed all your Yagis, etc to work together to produce a net zero torque or close to it. A minor consideration for Small Guns but not so for long-boom stacked monobanders, perhaps. _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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