[TowerTalk] wind load

[Rex Lint]

I believe it's saying that at 70MPH, the tower will support 15 sqft of
antenna/mast/whatever is put on it.  Most antennas will specify effective
"wind load" in square feet of "projected area."

      -Rex-
 
     K1HI
       Rex Lint
       Merrimack, NH 
-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Charles Coldwell
Sent: Thursday, February 18, 2010 1:16 PM
To: towertalk at contesting.com
Subject: [TowerTalk] wind load

I've been looking at various tower specifications, and often see
something like this

Maximum Wind Load	
70 MPH	 15 sq. ft.

I don't really understand how to interpret this.  I think a wind load
is a (static) force, and therefore should be measured in either
newtons or pounds.  IIUC, it should be proportional to the square of
the wind speed and that the constant of proportionality should itself
be proportional to the cross-sectional area to the wind.  So 15 sq ft
is an area, and 70 MPH is a wind speed, but I'm still missing some
factors in order to calculate a force.

Can anyone shed some light?

73s

-- 
Charles M. Coldwell, W1CMC
"Turn on, log in, tune out"
Winchester, Massachusetts, New England (FN42kk)

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