[TowerTalk] Rotating tower failures ?
Jim Thomson
jim.thom at telus.net
Mon Sep 9 07:17:49 EDT 2019
<PiRod does not approve of rotating towers (the steel tower cork screws) -
<which is a significant problem. Rohn towers (pipe vertical legs) are worse.
<73
<Tim K3LR## Has a rotating tower ever collapsed because of the tower....corkscrewing, or been permanently twisted ? The guy wires are not attached to the tower, but to the rings. The tower isfree to corkscrew all it wants to. It would be like having a 100-200 foot long driveshaft on a car. I only heard of one case where the wind was trying to rotate the yagis..clockwise.... while the op was trying torotate the tower counter clockwise. Base of tower rotated 20 degs CCW....meanwhile the top yagi had not moved an inch ! Finally, the top yagis caught up..and had rotated 20 degs. ## What does the entire array look like, when in a 80-100 mph wind? With all the yagis mounted to the same tower face, youalready have an offset load. With yagis mounted at their CG, and no tq comp sail installed, and wind broadside to the booms,you will end up with an absurd amount of TQ at the base of the tower. Jim VE7RF
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