[TowerTalk] 55G for 21 SQ foot Antenna?

[Dave Hachadorian]

On Sun, 22 Oct 2000 11:19:04 EDT "Michael Rauh" <michaelrauh@hotmail.com>
writes:

> I want to support a 21 square foot antenna load at a heigth of 160 
> feet.  
> The Rohn catalog says 55G is good for 14 square feet for 70 MPH wind 
> speed 
> at 160 feet or 16 square feet at 100 feet.  But look on page MS-66, 
> where 
> Rohn says an 80 foot 55G tower is good for 94 square feet!  From 80 
> feet to 
> 100 feet we lose 78 square feet?  What is going on with these 
> ratings?  How 
> can I find out what 55G is really able to handle?

I think you have to go by the "Guying Details" drawings, since the
strength of these towers is heavily dependent on the guying.

For 70mph, no ice, my 1996 book shows:

34.6 sq ft projected area at 100' (26.6 + 8) 
31.3 sq ft projected area at 160' (23.3 + 8)

Dave Hachadorian, K6LL
Yuma, AZ
K6LL@juno.com

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