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[TowerTalk] Visible Material

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Subject: [TowerTalk] Visible Material
From: (Chad Kurszewski WE9V)
Date: Thu, 20 Feb 1997 14:16:16 -0600
>       Rohn 25 is an antenna support structure 12 inches in face width. 
>Rohn 45 is 18 inches in face width.  Yet each is built with a lattice
>structure.  As a Volunteer Counsel, I think I'd like to make those
>measurements seem even smaller, if the right phrasing can be created. 
>Lattice towers have a lot of open air, so I'm thinking it ought to be
>possible to craft sentences such as:
>While carrying a 12 inch face, for each square foot of structure, only
>____ square inches of that square foot is steel.  The rest is clear air.
>For each square foot of this structure's face, only ___ % is solid
>surface, dramatically reducing visibility.

>From memory and may not be 100% correct:

Rohn 25 legs            = 1.25" dia
Rohn 25 crossbraces     = 5/16" dia

Considering 3 legs, and 3 crossbraces for a cross-section (not 100% correct),
the area is 4.6875 square inches.

And, if viewed from the correct angle, one leg and one brace is hidden,
for only a 3.125" obstruction!

Chad Kurszewski, WE9V         e-mail:
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