... Yes, obviously you couldn't use a crane to build it, because if you had a crane that high, you could just use it instead of building something else. I...
... For a rough comparison a Nimitz class carrier is about 100 000 tons. The Eiffel tower is about 10,000 tons. To scale up the Eiffel tower so that it about...
... This calculation is off a bit. The actual number is somewhat more, because of compounding. In fact, 3% a year means double every 24 years. In 120 years,...
... 8 million times 10,000 makes that 80 billion tons, or about 60 years of the world's steel production these days. Luckily, there are much better materials...
Check out this cool paper: http://science.ksc.nasa.gov/shuttle/nexgen/Nexgen_Downloads/Spaceport_Visioning_Final_Report.pdf There used to be a company named...
... 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...
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...
... 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...
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...
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....
5 Tesla fields would have an interesting effect on Earth's 0.00005 Tesla magnet field. 1200 km superconductors may be theoretically possible, but no one...
... 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....
... 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...
... 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,...
... Just so nobody gets confused: The $60 billion is for the Star Tram. The Long Island superconducting power transmission project I referenced has been...
... 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...
... 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...
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