[TowerTalk] 4130 Chrome Molly 1/4" vs 3/16" thickness

[john at kk9a.com]

It would depend on how the tubing was heat treated.  Without the material 
certification you will have no way to know the yield strength of your mast.

John KK9A




To: Towertalk <towertalk at contesting.com>
Subject: [TowerTalk] 4130 Chrome Molly 1/4" vs 3/16" thickness
From: Richard Thorne <rmthorne at att.net>
Date: Sun, 11 Mar 2012 12:33:41 -0500
List-post: <towertalk at contesting.com">mailto:towertalk at contesting.com>

Hello Group,

I'm finalizing my tower project.  Last thing to determine is how much of
a load I can put on my mast.

I have a 23' 4130 chrome molly mast which has a thickness of 3/16" vs a
more traditional 1/4" thickness.

Any idea how much yield strength the 3/16 has?  Looks like 1/4" has a
yield strength of 115,000.

I'm using MARC to calculate loads to be sure I don't overload the mast.
Right now I'm looking at a C31xr at 1 foot and a D240 at 10' up the
mast.  I'd like to see if I can safely install a WARC7 at the top at 15'.

Thanks

Rich - N5ZC