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

To: TowerTalk <>, <>
Subject: Re: [TowerTalk] HDBX-48 figures for 90 mph zone
From: John W <>
Date: Tue, 6 Dec 2011 12:43:53 -0800
List-post: <">>
Sorry Mike - just scrolled down further and noticed your follow-up post, and 
that you need 90 mph figures not 70 mph figures.
Can't help you there....
Maybe plant some pine trees around the tower?   
Another useful thing to consider is this: A freestanding tower is more likely 
to "fall like a tree" (as opposed to a guyed tower, which collapses in a pile.)
So if you assume the tower will fall like a tree in the most undesirable 
direction (which, after all, is exactly where it would probably fall anyway, 
due to corollary 1 of Murphy's law), what damage will it do?
If it will cause no harm to life or property that is not your own, then whoever 
is asking for the 90 mph drawings is just making you jump through a useless 
hoop that doesn't protect the town or any of its other residents.
I wonder... if you were to assure them in writing in your application that if 
the permit is approved you would hold them harmless and release them from any 
and all liability if the tower falls for any reason, and that you are accepting 
the risks associated with installing a tower whose rating at 90 mph is not 
known, maybe they will accept that?    I dunno - it's a stretch, but maybe you 
want to ask the zoning officer if that would be acceptable, in lieu of making 
the investment in getting the proper calculations done.    
Then again, if you want to be able to sleep at night when it's howling like 
gangbusters out there, then just bite the bullet and get the calculations done, 
unless you are lucky enough to find someone else who has.


Subject: RE: TowerTalk Digest, Vol 108, Issue 25
Date: Tue, 6 Dec 2011 12:30:34 -0800

The HDBX-48 is rated for 18 sq. ft of Area, and 360 lbs. of Thrust.
The components are:  BX3A, BX4, BX5, BX6, BX7, BX8, ACWS.
The base is 5'9" square x 4' deep, which requires 4.9 cu yds of concrete.
Source: 1979 Rohn Ham Tower Catalog.

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