Garolite. McMaster Carr
73
jim ab3cv
On Tue, Sep 2, 2014 at 9:26 PM, Stan Stockton <wa5rtg@gmail.com> wrote:
> John,
>
> I have no idea. What I do know is there is not a lot of wind load on a 60
> foot tower with no antennas on it and that it would take a tremendous
> amount of force to break a single four inch long 1-1/8 inch diameter solid
> fiberglass rod in two pieces if held tightly on either end.
>
> I'm not an engineer, but I assume in the case of three of those rods in
> the three tower legs that one of them can't break without all three
> breaking and would also assume those solid rods would be harder to break
> than it would be to collapse the three thin walled steel tubes used in 25G
> legs.
>
> I wonder what the side pressure is at the base of 60 feet of free standing
> 25G in a 60 mph wind?
>
> 73...Stan, K5GO
>
> Sent from my iPad
>
> > On Sep 2, 2014, at 7:58 PM, <john@kk9a.com> wrote:
> >
> > Your fiberglass inserts were amazingly strong to hold up 60' of
> freestanding
> > Rohn 25g! I would not try that using a standard base. Are there different
> > strengths of fiberglass material?
> >
> > John KK9A
> >
> > To: "w2ttt@att.net" <w2ttt@att.net>
> > Subject: Re: [TowerTalk] [Bulk] Re: tower insulators
> > From: Stan Stockton <wa5rtg@gmail.com>
> > Date: Mon, 1 Sep 2014 23:46:42 -0500
> >
> > Gordon,
> >
> > No, sorry for misunderstanding.
> >
> > Here is what I said regarding the 3/8 rod...
> >
> > "After seeing the towers bend in about a. 60 mph wind, I used 3/8
> fiberglass
> >
> > rod to guy them to small, homemade anchors - rod welded to a short piece
> of
> > angle. Each anchor is in about a bag of Quickcrete."
> >
> > The towers were previously unguyed. I believe the inside diameter of
> Rohn
> > 25G
> > legs are around 1.125 and that is the diameter of the rods that insulate
> one
> >
> > section from the other. - of course with holes drilled to accept the
> normal
> > sized bolts. Then I also have a fiberglass plate that spans the joint,
> > attached above and below the splice with galvanized U bolts.
> >
> > What K8LX understood is correct, and yes, the fiberglass rod I used is
> very
> > strong stuff. I got it from a company that makes those long rods with
> > galvanized fittings on either end for the utility companies - the ones
> that
> > are
> > rated for about 20,000 pounds in a straight pull. The fiberglass rod was
> > 1-1/4" diameter and I had it turned down on each end of maybe 12 inch
> long
> > pieces
> >
> > The towers are guyed at about the 25 foot level with the 1.125" rod in
> the
> > legs
> > and the 3/8 fiberglass rod for guy wires and the fiberglass plates that
> span
> >
> > the joints. I am not a bit worried about the 35 feet above the guys,
> given
> > that the towers survived some big winds over about 8 years with no guy
> wires
> > at
> > all.
> >
> > I looked, and there is a photo under low band antennas at k5go.com
> >
> > 73...Stan, K5GO
> >
> > _______________________________________________
> >
> >
> >
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