Solid is not stronger than hollow as it was explained to me its about
surface area. What would be interesting is carbon fiber and epoxy resin
over a round mold.
Randy
AC7NJ
-----Original Message-----
From: towertalk-admin@contesting.com
[mailto:towertalk-admin@contesting.com] On Behalf Of Don Havlicek
Sent: Thursday, February 28, 2002 6:50 AM
To: WB9UWA Jim Shaffer
Cc: towertalk@contesting.com
Subject: Re: [Towertalk] Strength of fiberglass.
Solid fiberglass rod is HEAVY .. much heavier than the same
length/diameter of aluminum.
Don
N8DE
WB9UWA Jim Shaffer wrote:
>
> Hi All,
>
> I am designing a VHF yagi array and strongly considering using
fiberglass
> for the booms. Does anyone have a strength rating for fiberglass that
is
> useful
> to the layman? For example, if 10 feet of 1/2" solid rod fiberglass
is held
> horizontal,
> how many pounds of weight would cause the end of the rod to deflect 1
foot
> (stiffness rating)?
> Also, and probably of greater importance, because even PVC can be
guyed
> if done properly, how much weight at the end of this pole does it take
to
> cause
> catastropic failure of the fiberglass (yeild strength)? I have heard
stories
> of fiberglass antennas
> bending way over in the wind and recovering fully. This is the sort of
low
> windload
> design I have in mind. I have some industry standard numbers for
fiberglass,
> but they
> are not something that I can make sense of. The strength rating is
something
> like 30,000 PSI.
>
> 73, Jim Shaffer, WB9UWA.
>
> _______________________________________________
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> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
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