At 02:12 PM 6/13/2005, knormoyle@comcast.net wrote:
>after my last post about falling derricks
>what kind of big tiltups others (wind turbines, wind speed) do,
>
>I looked some more.
>
>
>these guys talk about a 341 ft tiltup. Really!
>
>Some good data in there. (interesting where
>they have redundancy, guys, and manpower..and calculated forces)
>
>apparently they make a tower out of composite material...so it's light
>but stronger than steel? ...so it's not really fair :)
>
>http://www.isotruss.com/pdf/guyed%20towers%20installation%20manual%20030916.pdf
>
>
>They don't mention windload, but page 15 has this as the biggest
>example:
>500 lbs on top of tower.
>104 meter tower (supposedly the tower only weighs 575 lbs)
>60 ft gin pole (multiple attach points from gin pole to tower is key)
>7748 lb winch pull (and that's with a compound pulley?)
>
>
>general pics at http://www.isotruss.com/gallery.asp
>
>a photo spread of a BIG tiltup..you gotta click on the pics..insane!
>
>http://www.isotruss.com/photo-gallery.asp
>
>Now THAT would be a field day antenna!
Look how much that thing flexes while being hoisted. I'll bet the guy
cables weigh more than the tower itself. 82 meter high tower, 4 guy
directions, 8 guys, probably averaging 60m long each. That's almost 2000
meters of guy cable, mostly 1/4", call it 6000 ft. Probably about 1 pound
per 10 ft, so that's 600 pounds of guy cable.
_______________________________________________
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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