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Subject: [TowerTalk] ALUMINUM MAST
From: (Steve Weisbrod)
Date: Mon, 26 May 97 16:09:00 -0600
I just found the  exact mast and as near as I can tell from a number of   
sources it is 40000 PSI.  I just put a Force 12 4BA at 11' above the   
tower and a EF320 at 1.5' above the tower. They are rated a 7.5 sqft for   
the 4BA and 4.3 sqft for the EF320 but not at the same angle. I figure it   
will probably stay up with 70mph winds but maybe not well see. I used the   
MARC program.

73 Steve W8GAZ

From:  Richard Thorne
Sent:  Monday, May 26, 1997 2:00 PM
To:  steve; ''
Subject:  [TowerTalk] ALUMINUM MAST

I have a 18' by 2" od by .25" wall 6061-T6511 aluminum mast.  Anybody
out there know the yield strength?

I got a copy of the mast program, "MARC", from K7LXC.  Nice software,
easy to use.  I would recommend it to anyone planning a tower.  Once
I know the yield strength of my mast I'll know what I can put on it.

I'm hoping my C3 and a 2 element 40 meter.

Rich Thorne - WB5M
Amarillo, TX

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