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[TowerTalk] Vertical Antenna Tubing Strength (was: Increasing effective

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Subject: [TowerTalk] Vertical Antenna Tubing Strength (was: Increasing effective 4SQR array bandwidth???
From: n4kg@juno.com (n4kg@juno.com)
Date: Thu, 30 Aug 2001 00:06:49 -0600
Yep, NN4T had problems with 2 inch o.d. tapered to 1-1/4 and 
he didn't even have to consider ICE.  His 2 inch o.d. 42 ft verticals
with couplers seem quite rigid with only one set of guys.

Remember, maximum bending moment of a thin cylinder
goes up as the 4th power of the diameter so a 2 inch diameter
section will be 16 times stronger than a 1 inch diameter section.
A double walled section will be less than twice as strong as
a single walled section of equal wall thickness.

Tom  N4KG

On Wed, 29 Aug 2001 23:41:55 EDT Dinsterdog@aol.com writes:
> 2 1/8 inch to start, originally in 6 foot sections tappered 1/8 inch 
> with a 
> total of nine pieces double walled in joint areas about 6 inches on 
> the first 
> verticals....they been rebuilt so many times now not one is alike 
> the other-
> 73  Paul  N0AH

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