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On Sat, 26 Jun 2004 23:15:26 GMT, "Bill Daniels"
wrote: "Howard Eisenhauer" wrote in message news On Fri, 25 Jun 2004 22:42:15 -0700, Richard Riley wrote: On Fri, 25 Jun 2004 20:47:03 -0500, Big John wrote: :Scientist Sees Space Elevator in 15 Years : *Snip* H. This space elevator thing is elegant in a Newtonian sort of way but I suspect that there is a lot more to it that hasn't been completely thought out. You may well be right- not really my field but I've heard the math is the same as applies to suspension bridges, thats to say well understood. They say put it on the equator where the winds are low. Well, they are low most of the time but there is always the occasional typhoon. True, but anything with the kind of strength we're talking about here, under that amount of tension ain't gonna be much bothered by the occaisional blow. Then there are the electrical effects. A carbon nanotube cable will conduct electricity pretty well. Some claim it's a room temperature superconductor candidate. A tropical lightning strike can be several million amps and this cable will be a pretty good lightning rod. There's the induced voltages too. The normal atmospheric potential gradient is several million volts per meter. Last I checked deltaV/m was more liket ~200V. I heard the speculation about nanotubes being superconductors a few years ago back before they were able to produce them in decent quantities but haven't heard anything since, If they really are I think somebody would have noticed by now. To bad though, a superconducting space elevator would be a neat way to generate "free" power, a-la the NASA/Italian experiment with a tether a few years back. . What about tidal effects? Twice each day the Moons gravity will pull on the structure. Bill Daniels Yes, it will. Geosync satellites get pulled around quite a bit by the moon (& sun's) gravity. Then they get pulled back again., Not a biggie. H. |
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