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[TowerTalk] Lower Mast Question Again

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Subject: [TowerTalk] Lower Mast Question Again
From: (
Date: Sat, 21 Apr 2001 11:10:39 EDT
In a message dated 4/20/01 1:19:24 PM Pacific Daylight Time, 

> Rotational stress will work harden aluminum more than you might
>  guess.

    You better believe it. Rotational torque will elongate any hole with a 
bolt thru it. With an array your size, the aluminum mast will have a short 
service life. 

    For anyone putting more than one antenna on a mast, one way to somewhat 
minimize the total rotation torque is to stagger antennas on both sides of 
the mast - i.e.. first antenna boom on the right, second antenna boom on the 
left, etc. This will lower the total mast torque and stresses everywhere - 
rotator, rotator plate, tower, guys, etc. 

    Anyone who doesn't believe this will work hasn't read the articles by 
Dick Weber, K5IU, PE. 

Cheers,    Steve    K7LXC

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