[Towertalk] Calculating the Windload of a Helix Antenna?

[wd3q@erols.com (Eric Rosenberg)]

I need to figure out the windload of helix antenna, specifically
a 16 turn version made by G3RUH. I have no idea how to do this.

Here are the specs.... 

  Frequency       430-450    MHz
  Turns                16           
  Rating                1     kw      
  Reflector       600x600     mm      
  Helix diameter      240     mm
  Length              2.8     m     

  Weight              4.0     kg    

The antenna uses HD40 aluminium for the boom, ultra-violet resistant
black nylon for the spacers, and the helix structure is 10mm
copper tube.

There is a picture of it on James' web page: 

http://www.jrmiller.demon.co.uk/products/hlx70.html

Any help is appreciated!

73 & thanks in advance

Eric W3DQ
Washington, DC