[TowerTalk] Question on Windloading

[jimlux]

Dave Tipton wrote:
> If an antenna is rated at 180 lbs at 75 MPH, what would this translate into
> for SQ Feet of Windload?  (These numbers were conversions from Newtons and
> KMh)  The antenna in question is a Wire type Log Periodic that weighs about
> 71lbs.
> 
>  
> 
>  

Ballpark rule of thumb -> Force (lbs/sq ft) = (wind speed, mi/hr)^2/391

(or 400.. if you're doing it in your head)

So.. 20 mi/hr is about 1 lb/sf
      40 mi/hr is about 4 lb/sf
      80 mi/hr is about 16 lb/sf
     100 mi/hr is about 25 lb/sf

your question, 180 lb @ 75 mi/hr.. about 10 sf  (to 1 significant figure)