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## [TowerTalk] Quad square foot wind loading help!

 To: [TowerTalk] Quad square foot wind loading help! ve3tu@rac.ca (Steve) Sun Feb 9 11:41:20 2003
 ```Hi George, what you did wrong is calculate the total area of the antenna. The wind pressure is maximum when it is perpendicular to a surface and minimum when the wind is in line with a surface or wire. You have to do two calculations, one with the wind in line with the boom and figure out which surfaces are perpendicular to the wind and add up the surface area and one set of calculations with the wind perpendicular to the boom and do the same. The higher of the two numbers is the max wind load on the tower. One thigh you have to remember is that most crank up towers are only rated for max wind load at 50 mph and when the wind speed starts climbing the tower becomes very difficult to pull down especially if it does not have a pull down cable. The is why you see most crank ups sitting the the collapsed position and when you want to use it you have to crank it up. A real pain but the nature of the beast. 73 Steve VE3TU ```
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