[TowerTalk] Which Vertical is More Robust ?

[Joe Subich, W4TV]

> I was just wondering, since I am starting from scratch  if having
> larger dia tubing was a plus or a minus when all the factors are
> considered. BTW the EMT and aluminum tubing have about the same wall
> thickness (0.065" & 0.058").
Since the "strength" increases at the fourth power of the radius of
the tube while the load increases at 2 x the radius, without running
the exact specifics, I would suggest the larger diameter version will
be stronger overall.

73,

    ... Joe, W4TV


On 2020-01-01 12:41 PM, Gedas wrote:
> Hi there. You had it right on the nose below when you said structural.
> 
> I am aware of the minute differences in radiating efficiency between a 
> wire and length of tubing. As these are going to be elevated verticals 
> my primary concern will be which bends over first in a 70-80 MPH line wind.
> 
> I still have standing one such vertical I made over 20 years ago that 
> has survived horrible wind storms. It is a hybrid just like what I 
> described....simple EMT and aluminum tubing. I was just wondering, since 
> I am starting from scratch  if having larger dia tubing was a plus or a 
> minus when all the factors are considered. BTW the EMT and aluminum 
> tubing have about the same wall thickness (0.065" & 0.058").
> 
> Also regarding cost, my price to put two of these antennas together is 
> about half of the spider-beam pole which is why I am considering going 
> this route. TU very much for ur input.
> 
> Gedas, W8BYA
> 
> Gallery at http://w8bya.com
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>