--- In space-elevator@yahoogroups.com, Craig Holm <craig_holm@...> wrote:
>
> 1200 km superconductors may be theoretically possible, but no one
> reading this will see in their life time unless there's a few very
> significant technological breakthroughs.
>
Here is another very interesting link about superconducting cable in very
practical utility applications since about 2000, when we were all very much
alive...
1,200 km may still be a decade or two down the road, but not for lack of
technological breakthroughs. In fact, the breakthrough has already happened, and
transcontinental electric power transmission is now feasible for the first time.
It is funny how the future can happen before our very eyes and we miss the
significance until it becomes history...
... Effect? What effect? None other than to drown it out in the vicinity of the device, admittedly a very large area. ... I think you are underestimating the...
... Here is another very interesting link about superconducting cable in very practical utility applications since about 2000, when we were all very much...
As I recall the Sunshield episode of Discovery Project Earth considered a coil gun for launching lenses to deflect light away from Earth. The project called...
... To be feasible, both StarTram and coil gun will need to be designed in such a way that the energy needed during launch is first stored in the system, as...
... The cost of Alumina Ceramic would need to come down in price. Some type of active building control might keep it up. You might need these type of systems...
... Yes. However, alumina is made from some of the most common elements in the Earth's crust, so for an SRS it would be an abundant material. Silica glass...
Well, what do you know, according to here: http://www.sciner.com/Opticsland/FS.htm Fused silica has a compressive strength of 1.1 GPa and density of 2.2. That...
... Or that Star Tram. That actually does use Lorentz force, in contrast to those other ones. Less moving parts, also, which could be a tremendous advantage....
... How so? IIRC, inertia is used as the primary force to keep things up, and magnetic attraction secondarily to connect to the cable and to impart the motion....
... You're mistaken. Inertia isn't a force. ;-) ... Well... there's a current in the movement of the electron clouds around the atoms that is the reason for...
... Magnets hold up the ancillaries to the rotor, but it is the rotor that holds up everything. By inertia, if you call it a force or not. To say the loop is...
2009/6/4 Andreas <awnd329@...> ... Magnets hold up the rotor though ;-) ... Well, that's true as well; those bolts do do that, but more than that, those ...
... Ok, so the loop/bridge are held up by 1) turnaround magnets / towers 2) rotor inertia / cable tension 3) sheath magnets / roadway bolts All of the above,...
... Well, I have been taught it. The thing is though, that the efficiency of a turbomolecular pump goes as the square of the speed, and this is about an order...
... I am not an expert, but I think turbomolecular pumps have multiple stages, and each has blades angled just the right way, and they have to have a pretty...
... They do that because the turbine is spinning much more slowly; also the geometry is radically different. I think turbines spin at about 350 m/s, whereas a...
... No, no idea. It was on UK TV years ago. It was absolutely the minimum you could imagine- it was a wire going around in a cable. It did lift though. ... -- ...
... Yes, I remember, I called that a sputtering chain reaction back when we discussed it elsewhere. It could have been a show-stopper, but it turns out to be...
... size, ... strength. I'm not exactly seeing how, but I've only been skimming this conversation. ... I'm all about flywheels. :-) Rub my nose in a previous...
... I don't think there is much, but it follows directly as a cross between the launch loop (particularly the circles where the loop turns around) and a...
... Just so nobody gets confused: The $60 billion is for the Star Tram. The Long Island superconducting power transmission project I referenced has been...
I would say a 60 billion for a Star Tram is deal. More less half the price of the space station. Just for comparsion the 2009 US DOD budget is more than 600...
From this type of analysis, we can expect that building Great Pyramids should be dirt cheap. Thus far, the most significant Pyramid of recent construction...
The only point I was making was we could built between 30 and 100 Eiffel Towers today if we wanted too. A space tower model after the Eiffel Tower would take...
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