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Re: [TowerTalk] HDBX-48 figures for 90 mph zone

Subject: Re: [TowerTalk] HDBX-48 figures for 90 mph zone
Date: Tue, 6 Dec 2011 17:23:35 -0500 (EST)
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Hi Gene and Mike, my recollection is there were no 90 mph calculations for  
the BX series towers.
The conversion from 70 to 90 mph is not simple or straightforward. The  
problem is that the tower itself represents a large windload and when that is  
taken into account, there is nothing left for an antenna load.
Sorry to be the bearer of bad news!
Gerald K5GW
In a message dated 12/6/2011 3:43:51 P.M. Central Standard Time, writes:

As I  recall wind pressure "on a flat surface" at 70 mph is 20.6 lbs/sq 
so  if the  tower is rated for
18 sq ft at 70 mph, would it be too much of  a stretch to say to the zoning 
board that since wind pressure at 90 mph is  34 lbs/sq ft, by simple math, 
the tower should be good for 10.9 sq ft at  90 mph ?
Gene /  W2LU


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