[TowerTalk] US TOWER HDX-89 / Tash DX86 Wind Rating Differences

[Steve Jones]

Rich-

What standard is Tashian using, perhaps TIA-222C?  

My HDX-589 was designed in 2011 under TIA-222F.   TIA-222G is the latest.
The later revisions significantly tighten the allowable wind loads.

73,

Steve
N6SJ


-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
Richard Thorne
Sent: Saturday, June 10, 2017 7:00 AM
To: Towertalk
Subject: [TowerTalk] US TOWER HDX-89 / Tash DX86 Wind Rating Differences

This may not be comparing apples to apples but here's my question after
studying the two towers.

US Tower HDX-89 claims 9.2 sq ft of max allowable antenna wind area 90 mph 3
second gust Tash DX86  claims 21 sq ft of max allowable antenna wind area 85
mph 3 sec gust

After looking at both designs they both start with a lower section that is
28.75" wide and a top section that is 13 7/8" (Tash) and 13 15/16" 
(US Tower)

So the designs appear to be the same, why are the allow able antenna wind
loads so different?  I realize that one is based on 90 mph the other on 85
mph.  Does the 5 mph delta add up to a 11.8 sq ft difference?

Thanks in advance.

Rich - N5ZC


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