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

[Rob N1KEZ]

Make sure you know what the wind ratings are for your area before getting excited about a particular tower. Manufacturers assume you live in the most favorable place. Wind rating for my tower location turned out not to be 90 Mph but 130Mph! (Ridge crest/Slope etc). 

73!
N1KEZ de Rob

Sent from my mobile device. 
Pse excuse brevity and any errorz. 

On Jun 10, 2017, at 7:00 AM, Richard Thorne <rthorne at rthorne.net> wrote:

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