[TowerTalk] FW: Mast Wall Thickness

[john at kk9a.com]

I have not used a 2" mast in years.  At P40A I had two Yaesu G-2800DXA
rotators and my 2 1/2" aluminum mast fit into their clamp perfectly.  My
prop pitch rotators have 3" masts. I am sure that other rotators also
accept larger masts.

John KK9A



To:	towertalk at contesting.com
Subject:	 Re: [TowerTalk] FW: Mast Wall Thickness
From:	 "Joe Subich, W4TV" <lists at subich.com>
Date:	 Wed, 26 Feb 2014 09:30:17 -0500
com>


Increasing the wall size does not "increase the strength" of the
material - it reduces the stress on the mast for a given load.
Put another way it increases the load handling capacity of the mast.

In any case, it is far better to increase the diameter of the mast -
the stress in a 2.5" OD 1/4" wall mast will be only about half that
in a 2" OD, 1/4" wall mast for the same applied load.  It's a shame
that the makers of antenna rotators simply don't understand that and
continue to insist on 2" mast only.

73,

   ... Joe, W4TV