> Guyed towers obviously *do* deflect.
You can feel it more with Phillystran guys. My 110' Rohn 55 with Phillystran
guys always feels less rigid to me than my friend's 100' Rohn 45 with EHS
guys, even though the tension on our guys is the same.
73, Dick WC1M
> -----Original Message-----
> From: Pete Smith [mailto:n4zr@comcast.net]
> Sent: Friday, July 17, 2009 4:07 PM
> To: Dick Green WC1M
> Cc: TowerTalk; 'RICHARD SOLOMON'
> Subject: Re: [TowerTalk] World's toughest fixes - 2000' tower
>
> My brother-in-law used to have an office on the 85th floor of the Sears
> Tower. When the wind blew - it seems to do that often in Chicago - his
> pictures would lean out from the wall.
>
> Regarding the guyed/unguyed question, take a look at the guyed tower
> study on K7NV's web site for Yagistress, at
> <http://k7nv.com/notebook/towerstudy/towerstudy1.html> Guyed towers
> obviously *do* deflect.
>
> 73, Pete N4ZR
>
> On 7/17/2009 2:59 PM, Dick Green WC1M wrote:
> >> IIRC, the Empire State Building is spec'ed to sway in high winds. The
> >>
> > exact
> >
> >> numbers elude me.
> >>
> >
> > I think that's the case for all tall buildings, and must require some
> > interesting engineering for various parts to flex properly in response.
I
> > vaguely remember hearing a long time ago about a new skyscraper (can't
> > recall where) on which the window mountings hadn't been specified
> correctly.
> > When the building swayed, panes would occasionally loosen and fall out.
Of
> > course, they did a quick fix. Must have been very expensive because
there
> > are a lot of windows in a tall skyscraper.
> >
> > 73, Dick WC1M
> >
> >
> >> -----Original Message-----
> >> From: RICHARD SOLOMON [mailto:w1ksz@q.com]
> >> Sent: Friday, July 17, 2009 12:54 PM
> >> To: TowerTalk
> >> Subject: Re: [TowerTalk] World's toughest fixes - 2000' tower
> >>
> >>
> >> One day, many years ago, I was on the observation deck of the Empire
> >>
> >> State Building. There was a crowd of schoolgirls there with chaperones.
> >>
> >>
> >>
> >> I had a 2" steel Ball Bearing that I placed on the steel floor. Now it
was
> >>
> >> a rather windy day. Shortly the ball started moving back and forth. One
> >>
> >> of the chaperones asked me why the ball was moving, I told her the ball
> >>
> >> was not moving. After a bit of thought, they quickly moved the group to
> >>
> >> the elevators !!
> >>
> >>
> >>
> >> IIRC, the Empire State Building is spec'ed to sway in high winds. The
> >>
> > exact
> >
> >> numbers elude me.
> >>
> >>
> >>
> >> 73, Dick, W1KSZ
> >>
> >>
> >>> Date: Fri, 17 Jul 2009 09:13:13 -0700
> >>> From: richard@karlquist.com
> >>> To: jimlux@earthlink.net
> >>> CC: martin.s.ewing@gmail.com; towertalk@contesting.com
> >>> Subject: Re: [TowerTalk] World's toughest fixes - 2000' tower
> >>>
> >>> I am near some 2000 foot towers. According to the engineer
> >>> who built them, they basically don't move at all at the top.
> >>> He says he doesn't notice anything when the wind blows.
> >>>
> >>> Rick N6RK
> >>>
> >>> jimlux wrote:
> >>>
> >>>> Martin Ewing wrote:
> >>>>
> >>>>> Inquiring minds want to know: why is 2000 ft scarier than 20 ft?
More
> >>>>> time to think on the way down?
> >>>>>
> >>>>> Morbid humor, I know, but it's something I consider when I feel a
> >>>>>
> > need
> >
> >>>>> to climb my 20 ft roof mount. ;-)
> >>>>>
> >>>>> 7
> >>>>>
> >>>> THe top of a tall mast moves around a LOT more in the wind than a
> >>>> shorter one.
> >>>> _______________________________________________
> >>>>
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> TowerTalk mailing list
> >>>> TowerTalk@contesting.com
> >>>> http://lists.contesting.com/mailman/listinfo/towertalk
> >>>>
> >>>>
> >>>>
> >>> _______________________________________________
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> TowerTalk mailing list
> >>> TowerTalk@contesting.com
> >>> http://lists.contesting.com/mailman/listinfo/towertalk
> >>>
> >
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >
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