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[TowerTalk] Mast stress

Subject: [TowerTalk] Mast stress
Date: Thu, 16 Mar 2006 14:00:59 EST
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In a message dated 3/15/2006 1:03:33 P.M. Pacific Standard Time, writes:

>     I believe the article to which Jim refers  can be found in NCJ Jan/Feb 
1992, which itself is a reprint of two articles by  Stan W7NI from the 
Sept/Oct 1982 and March/April 1983 (ancient history!)  NCJs.  The article is 
Antenna Mast Design.   

>     Dick K5IU also wrote a series of articles on  the calculation of Yagi 
wind loads.  They are:  Determination of  Yagi Wind Loads Using the Cross-Flow 
Principle; Aerodynamic Balancing: Part 1  and Part 2, found in Comms Quarterly 
Spring 1993, Summer 1994 and Winter 1995,  respectively.  

>     I know I bought reprints  of K5IU's articles through ARRL.  I believe 
K7LXC sells/sold the Antenna  Mast Design reprint.  He'll jump in here, I'm 
    Ya think?!?
    Dick, K5IU, sent me a marked-up copy of Stan's  article pointing out 
several errors so I would discount the W7NI information.  Dick is a PE and Stan 
not - you can draw your own conclusions. 
    I had a mast stress program written using the  info in Dave Leeson's, 
ex-W6QHS now W6NL, book, Physical Design of Yagi  Antennas. It's called MARC - 
Mast And Rotator Calculator - Program. It's  available for ten bucks from 
_www.championradio.com_ ( . 
Steve    K7LXC
Champion Radio Products
Cell: 206-890-4188


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