Date: Fri, 20 Jan 2017 11:33:06 -0500
From: "Joe K2UF" <joe@k2uf.com>
To: "'Jim Thomson'" <jim.thom@telus.net>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] fiberglass insulators for yagis
Hi Jim,
I Have used Max Gain for several years for fiberglass supplies. Their web
site is 'mgs4u.com'. They have a good selection of fiberglass etc.
Good luck,
73 Joe K2UF
## max gain systems has solid fiberglass insulators....all the way up to a
max of 1.5 inchs in diam. Mcmaster carr only has em up to a max of 1.25
inchs.
## max gain systems offers them in 2-4-8 ft lengths and also 6 inch lengths.
They
will also cut them to any length you want. Depending on diameter, they also
come
in off white... or black. Its the 1.5 inch diam solid rod that I require.
## as far as the solid fiberglass vs solid Aluminum... 6061-T6, I have
decided to use
solid 6061-T6. Since the oem insulators are no longer required, the oem 3
inchs of
exposed insulator is also not required. So the new, solid one inch AL rods
will be used as
an inner linear / splice joint. IE: the oem al tubing on either side of the
oem 1 inch
solid fiberglass rod was 1.25 inch OD x .083 wall aluminum tubing...which
was swedged
to fit the 1” solid fiberglass. I will simply butt the 2 x pieces of 1.25
inch OD material together,
with the new 1 inch solid Al rod inside as the splice joint. Losing 3 inches
on either side is a non issue,
since the overall length in the re-design is going to be reduced anyway. Then
no need to install a
jumper across any insulator. Just a single 1/4 – 20 SS bolt on either side.
## BTW, tensile strength is stretching material. EHS steel cable is good for
tensile strength, but obviously
lousy for compressive strength. Yield strength is when you bend it... till
the point where it almost breaks.
But yield and flex are 2 x different things. Fiberglas fishing rods wont
break, but they will flex like crazy, but they
are also very long vs an insulator, and designed differently. Wood has loads
of compressive strength, but lousy
tensile strength.
Jim VE7RF
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