[TowerTalk] : wind loading

[K7LXC at aol.com]

In a message dated 5/2/2010 7:30:14 A.M. Pacific Daylight Time,  
towertalk-request at contesting.com writes:

>  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.


        Funny you should ask. While  it doesn't account for crossbooms or 
similar more complicated installations, the  Mast, Antenna  Rotator 
Calculator (MARC) Program will give you the info you  need. And it's only ten bucks 
from _www.championradio.com_ (http://www.championradio.com) . 
 
Cheers,
Steve      K7LXC
Champion Radio Products
Cell: 206-890-4188