I just saw the previews for this must-see show on the National Geographic Channel, next Thursday, July 23. My palms are still sweaty..... Bill KO7AA _______________________________________________
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 moun
THe top of a tall mast moves around a LOT more in the wind than a shorter one. _______________________________________________ _______________________________________________ TowerTalk mailing list T
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 _____________
That what the "Engineer" said not the tech who does the work :) the spec from rohn is about 1-2 inches of movement (if I recall correctly) for each 100ft at the top. Even tall buildings move with the
Author: "Thomas F. Giella NZ4O" <nz4o@tampabay.rr.com>
Date: Fri, 17 Jul 2009 12:41:34 -0400
I saw that particular program recently. The guy that is the star of the show seems fearless no matter what the big fix is. When I was 17 years old I was a journeyman electrician and A/C & refrigerati
When I was in high school I knew a ham that worked at the local tv transmitter site. He took me on a tour once. There was a 996 ft. tall tower next to the transmitter building. This was in Michigan:
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 f
We use to often go to the top of the highest building (921 feet, floor 73) in downtown Dallas to service our ATV repeater transmitter. This building does indeed sway in high winds. If fact, the eleva
Correct, but buildings are not guyed. Apples and oranges. Rick N6RK _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@co
Might depend on the tower and the wind, and, certainly some psychology. I've been up a several hundred foot tower, and it certainly moved. Not abrubtly, more like a sort of swaying with a period of s
Most, if not all, tall buildings now are constructed with a dampening system at the top to counteract the sway. When I first saw the segway I had a thought that someday similar technology may do away
If I recall correctly, tall buildings in earthquake zones are dampened to prevent destructive oscillations. Been in several earthquakes in Japan and Taiwan and the undampened buildings sway enough to
Somehow I think you mean "damped" and not moistened ;) _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com
interesting concept.....However, being practical, you can sure buy a lot of guy wires for the price of a Segway. * 73's Jim W5IFP * _______________________________________________ __________________
exact 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
It was the John Hancock Tower, in Boston, in the early 70's. The solution was thicker glass! They also had to ADD dampers: "The building's upper-floor occupants suffered from motion sickness when the
Interesting.. but the active system (in buildings) only deals with transient loads (e.g earthquakes). It can't deal with a static load.. And, the whole thing on guys is to let you use a thinner, more
John Hancock promptly sued the contractor/architect for the damage. The contractor/architect said, "No problem, we'll just have our insurance company pay for it." You can probably guess who had insur
Author: "Jim Miller KG0KP" <JimMiller@STL-OnLine.Net>
Date: Fri, 17 Jul 2009 14:57:38 -0500
OK, I have to say it. I was up 54 feet and to me that's a mile. Working to take down a tribander and trees all around that had grown through the tower and up and into the antenna. Calm day, mostly, a