TOMK5RC@aol.com wrote:
>
> In a message dated 7/1/98 10:08:18 PM Central Daylight Time,
> gscholten@michamber.com writes:
>
> > These mast are all good but you might consider using 1-1/2" Schedule 80
> > pipe. It is quite a bit thicher than sch 40 pipe and uses a higher
> > grade of steel. It works well for a lot of people and is less
> > expensive. Another option is to find a soil testing company, their
> > drill rigs use 4350 semi stainless steel drill rods. When the ends of
> > the rods get bad they have to throw them out but they make fantastic
> > mast pipe with incredable strength. These drill rods come in many
> > diameters.
>
> ARGHHHHH!!!!!!!!
>
> Please don't dispense advice based on pragmatic experience. Schedule 40, 80,
> whatever, pipe was designed to carry liquids and gasses, not to support
> anything. You will not find structural data published on water pipe.
>
> Using any other material based on "It looks heavy" or "It has incredible
> strength" is equally foolhardy. I know, we have all "gotten away" with using
> almost anything for mast material, but, when someone is starting from the
> beginning, the best thing to do is use K7LXC's mast calculation program and
> then purchase the appropriate material for the job. Water pipe is never
> appropriate and aluminum is seldom strong enough, unless you are mounting one
> antenna 6" above the top of the tower.
>
> Tom, K5RC
>
WRONG, you just have not looked for the structural data, it does exist.
Anyone that owns a "Machinery's Handbook" has the needed data. It is
also available from pipe and tubing manubactures.
The "Machinery' Handbook" is a very common industrial bible.
N8GS
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