[TowerTalk] wind loading

[jimlux]

Gregg Seidl wrote:
> ND9Z and myself are trying to calculate what size tubing I need for my 
> planned 4*6M-5XG array. What I'd like to know is this:how many pounds of 
> force does the wind exert on each square foot of antenna load at 80MPH. Is 
> there an online guide to that? Just trying to figure if a 4.5 inch with a 
> .250 wall thickness is in the ballpark for 80 MPH. This would be the 
> croosboom. I'm planning 2 inch by .187 wall for the vertical peices. This 
> would be a 20 foot by 20 foot H frame. The antennas have a 2.7 sq ft rating 
> each.
> 
>   Gregg  K9KL 
> 


in round numbers..

pounds per square foot = v(mph)^2/391

Sea Level ICAO atmosphere, standard temperature and humidity, yadda, 
yadda, yadda...

(if doing the calcs in your head, 400 works about as well as 391)