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[TowerTalk] Mast

To: <towertalk@contesting.com>
Subject: [TowerTalk] Mast
From: <giw@bellsouth.net>
Date: Wed, 17 Mar 2004 19:52:48 -0500
List-post: <mailto:towertalk@contesting.com>
Someone please tell me if I am about to make a mistake. I plan to use a 20 ft.  
long schedule 80 6061-T6 aluminum tube ( 1.9" OD .200 wall thickness)  for a 
mast on which I plan to put a Steppir 4el (9.7sqft) at 3 feet above the thrust 
bearing. The second antenna is a hygain rotatable dipole (2.8 sqft.) at 12 feet 
above the Steppir.  A windows program I have says this will produce a total of 
21365 in-lbs at 70 mph. Data says that the 6061-T6 has a shear strength of 
29700 PSI.  Am I drawing the wrong conclusion that this will work OK. Need some 
good old tower talk expert advice ASAP.  Thanks Van W4GIW
_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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