Date: Wed, 07 Dec 2011 00:19:21 -0500
From: K8RI <K8RI-on-TowerTalk@tm.net>
Subject: Re: [TowerTalk] Fwd: HDBX-48 figures for 90 mph zone
To: towertalk@contesting.com
Message-ID: <4EDEF759.7040005@tm.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 12/6/2011 11:13 PM, HansLG@aol.com wrote:
>
> In a message dated 12/6/2011 4:43:51 P.M. Eastern Standard Time,
> w2lu@rochester.rr.com 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?
73
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
paper.
Then when u install it, add the extra section back in. IF you ever did hit it
with
a 90 mph wind, and a big ant, ur gonna be in for an eye opener. That thing
about
70 mph = 20.6 sq feet. That's from 1976. 222- REV-D. It's now REV G !
A Trylon T-500, 72' tall..is 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
ice,and
you can kiss it goodbye. I wonder if the factory will even give you a
windload
rating for 90 mph ?
Jim VE7RF
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|