Ok, How about an educated guess, then?
Jim Shaffer, WB9UWA.
----- Original Message -----
From: WB9UWA Jim Shaffer <wb9uwa@gte.net>
To: <towertalk@contesting.com>
Sent: Thursday, February 28, 2002 1:45 PM
Subject: [Towertalk] Strength of fiberglass.
> 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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