[TowerTalk] Which Vertical is More Robust ?

[Richard (Rick) Karlquist]

Correction:

The strength of a solid rod increases as the CUBE of
the radius.  However, for a thin wall hollow tube,
it increases roughly proportionately to the square
of the outer radius, or exactly the difference
between the cubes of the outer radius and inner
radius.

What does increase as the fourth power of radius is
the STIFFNESS of a solid rod.

Rick N6RK


On 1/1/2020 11:41 AM, Joe Subich, W4TV wrote:
> 
> 
>> 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
>