thanks for the advice
the fibreglass tube filled with epoxy resin could be the way to go
although i am not really worried about compressive strength
with a self-supporting tower i am more worried about the bending
giving rise to large tensile stresses especially at the base
total weight of the telescopic mast is less than 20 pounds
i recall that porcelain has massive compressive strength
but is quite brittle under tension
any other ideas for maximum tensile strength?
sam dellit vk4zss
----- Original Message -----
From: "alsopb" <email@example.com>
To: "Sam Dellit" <firstname.lastname@example.org>
Sent: Friday, March 02, 2001 8:12 PM
Subject: Re: [TowerTalk] base insulator for 50ft aluminium telescopic mast
> Glass bottles used to work. Harder to find in this era of plastic.
> They can be quite strong in compression. If you're worried about
> strength fill the bottle with epoxy or fiberglass resin. Fiberglass
> tubes work too.
> 73 de Brian/K3KO
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