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[TowerTalk] HDBX-48 figures for 90 mph zone

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Subject: [TowerTalk] HDBX-48 figures for 90 mph zone
From: "Jim Thomson" <>
Date: Wed, 7 Dec 2011 04:24:43 -0800
List-post: <">>
Date: Wed, 07 Dec 2011 00:19:21 -0500
From: K8RI <>
Subject: Re: [TowerTalk] Fwd:  HDBX-48 figures for 90 mph zone
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On 12/6/2011 11:13 PM, wrote:
> In a message dated 12/6/2011 4:43:51 P.M. Eastern Standard Time,
> writes:
> As I  recall wind pressure "on a flat surface" at 70 mph is 20.6 lbs/sq
> ft.,
> 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

Regardless of wind area isn't there a boom length limitation on both the 
BX and HDBX series?


Roger (K8RI)

##  yes, I think they reduced it to just 10' years ago..and sales plummeted. 
Just fudge the ant wind load a bit, and perhaps 'take out' one section on 
Then when u install it, add the extra section back in.   IF you ever did hit it 
a 90 mph wind, and a big ant, ur gonna be in for an eye opener.   That thing 
70 mph = 20.6 sq feet.  That's from 1976. 222- REV-D.   It's now REV G ! 
A Trylon T-500, 72' good for 22 sq feet @ 70mph....but only 6 sq feet
at 100 mph.  The tower itself will eat up all the windload.   Toss in any 
you can kiss it goodbye.   I wonder if the factory will even give you a 
rating for 90 mph ? 

Jim  VE7RF   

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