Stiffness (not strength) of a tube of a
given wall thickness is roughly proportional
to the *cube* of the diameter. A pipe tower
only 2 inches in diameter for the top 20 feet
is nowhere near as stiff as any kind of tower
that is 12 inches or more wide. This is simply
physics.
I have an MA-550 and you should have seen it
move during the 1989 earthquake! At least
it stayed up.
Rick N6RK
(Note: the actual stiffness coefficient is the
outer diameter to the 4th power minus the
inner diameter to the 4th power)
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com]On Behalf Of Ralph Danyluk
> Sent: Sunday, July 27, 2003 2:14 PM
> To: towertalk@contesting.com
> Subject: [TowerTalk] MA-550 Tubular Tower
> Importance: High
>
>
>
> Has anyone had any experience with MA-550 tubular crank-up
> tower made by
> US Tower Corporation?
> Comments, advice would be much appreciated.
>
> I am considering buying one - it appears to be a perfect fit
> for my site.
> It will support a Force-12 C-3SS.
> One of my questions is the amount of sway at the top when
> fully extended,
> compared to a standard lattice tower.
>
> I phoned US Tower, but have yet to get a call back. Comments
> on dealing
> with US Tower will also be welcome.
>
> Thanks,
> Ralph - VE7AOP
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless Weather Stations", and lot's more. Call Toll Free,
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
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>
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