[TowerTalk] mast material

[RICHARD SOLOMON]

Given that the Stress Factor ..."S"... is a major component of the equation, how does
one determine the "S" factor, considering that the material in question could have been
made in Pittsburgh, China or Bangaladesh ??
 
73, Dick, W1KSZ



> Date: Wed, 6 Aug 2008 11:16:44 -0500> From: brubin2010 at gmail.com> To: k1xx at cfl.rr.com> CC: jperalta4 at verizon.net; jruing at ameritech.net; k3cc at verizon.net; K8RI-on-TowerTalk at tm.net; towertalk at contesting.com> Subject: Re: [TowerTalk] mast material> > DO THE MATH FIRST !! YOU WILL SEE THAT FENCE POST IS NOT SUFFICIENT.> > http://www.math.niu.edu/KARC/mast/> > > Bill N1HWC> > > On Wed, Aug 6, 2008 at 10:45 AM, <k1xx at cfl.rr.com> wrote:> > > Julio:> > I don't totally agree with all your statements regarding top rails. I've> > used them very successfully in the past. Since this goes back a few years,> > my memories a bit fuzzy. But, I seem to recall that there might be a heavy> > duty top rail which is "just slightly" under 2 inch OD and not much smaller> > as you mentioned. I'd have to go out back and measure one to determine the> > actual size.> >> > In several cases, I used 12'ish foot lengths for yagis mounted at the top> > of the tower with the rotor recessed 10 foot into the tower. In one case, I> > had a full 20 foot length with a custom-turned insert placed down into the> > top rail. This one had a big 6 element 10 meter beam on a 3" boom at the> > very top (10 foot out of the tower). I can't count how many ice and snow> > storms that combo survived.> >> > If any mast material's overloaded, it will bend. Doing the analysis is the> > first best step.> >> > 73 charlie, k1xx> > _______________________________________________> >> >> >> > _______________________________________________> > TowerTalk mailing list> > TowerTalk at contesting.com> > http://lists.contesting.com/mailman/listinfo/towertalk> >> _______________________________________________> > > > _______________________________________________> TowerTalk mailing list> TowerTalk at contesting.com> http://lists.contesting.com/mailman/listinfo/towertalk