[TowerTalk] Question on R-TA-45 Torque Bracket
lists at oakcom.org
Sat Jun 15 21:31:11 EDT 2019
All great points. A tall skinny tower with slip rings, with many large
antennas, in a high wind area, is a temporary setup IMO.
On 06/15/19 20:32 PM, Steve Bookout wrote:
> Hello all,
> Couple of comments on K4JA's tower failure.
> The lower half of the tower was shielded from some of the wind by way of
> tall trees at the edge of the field, where the woods started. The upper
> half went way above the trees and took the full force of the wind.
> Also, his stuff was fully rotating from the base up to the top, with
> slip rings at the guy points. Because of this, the guys really had
> nothing to do with limiting the twisting of the tower. It just twisted
> as it wanted all the way from the ground to the top.
>> I would not put more on a tower than Rohn's wind load ratings allow
>> just because a torque guy is used. A 6 way star guy does a great job
>> of minimizing twisting. There is more leg compression since there are
>> more guys wires however a Rohn 45 is designed to go 300' high and the
>> tower in the post is only 110'. I believe that twisting can cause
>> tower failure, K4JA's tower twisted back and forth in hurricane winds
>> until it failed. Adding a star guy is probably a good thing if the
>> antenna has a long boom. I use star guys and a taper pier pin base on
>> all of my towers.
>> John KK9A
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