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Re: [TowerTalk] Rohn HDBX48 failure

To: towertalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Rohn HDBX48 failure
From: Steve Maki <steve@oakcom.com>
Date: Wed, 13 Apr 2005 17:34:59 -0400
List-post: <mailto:towertalk@contesting.com>
K8RI wrote:

> One thing I forgot to add in a previous post about rotors mounted down in a 
> tower.  When mounted "in the tower",  but at the base there is no give to 
> take up the stress and that small area takes the entire brunt of the torque. 
> If the rotor has a mount on the concrete, or a seperate mount it removes the 
> stress from the tower.

Actually, there's a lot of cushion provided by a long
mast.

I had an extended guyed 72' HDBX style tower in the 60s,
with the rotator a couple feet off the ground, rotating
a 4 el tri-band quad through 70' of 1-7/8" OD pipe. I
was amazed at the almost 45º twist in that mast in high
winds. It was ridiculous, really. I should have used
a 2-1/2" or 3" mast on that one.

Steve K8LX

_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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