... They say "On the basis of strength tests the Texas researchers report that their nanotube product can be drawn into fibers that exhibit twice the stiffness...
I will pay $500 to the first person to post a URL to this group of a web site with the following properties: 1) It must be selling CNT string/rope with for...
... I asked Dr. Edwards about all this, and this is what he said (I assume everyone would consider him to be "in the know", whether they agree with his...
... You used the word 'maybe' because the analogy may not be true. Rope strength improvements 'maybe' similar to Moore's law, but maybe it isn't. Even if it...
... To me, the line looks pretty straight from 1940 to 1990, but the 1990's appear to have produced a significantly increased and consistent gradient compared...
... Hi Vince, you have repeated that the SE needs 65 GPa fibres, which is clearly not true. By tapering the ribbon, less than 65 GPa could successfully be...
... I agree. ... Ouch. In both my simulator examples #21 and #36 I used a 35.1 GPa (10 times Spectra-2000). So I also agree with you here! I picked up the...
... For sure. In one of his papers, http://www.spaceelevator.com/docs/521Edwards.pdf He mentions a 5 GPa CNT composite on page 9. On page 10 he has a graph...
... Hi Vince, the approx 65 GPa is an important benchmark as that would make a fibre self supporting to past GEO, but of course we need some safety factor and...
... In my simulations I had a safety factor of 2. So each point on the tether is twice as strong as the expected load. So you might really be able to do it...
... Brad Edward's idea is to deploy a 130GPa cable, and use it up to 65GPa. It would be tapered, because if it wasn't tapered the required mass of cable would...
... In those simulations I had a density of 970 Kg/meter^3. People seem to be expecting 1,300 Kg/meter^3 for a CNT rope. If I use that in the simulation I get...
... Why is necessary to assume 1300kg/m^3? It won't be solid nanotube. I'm thinking that on the micrometer scale the ribbon would resemble a chain-link fence,...
... In that case, you will have to reduce the strength by the same amount as the cross-section of the cable would be pretty sparse. What is the density of a...
... The problem is making sure that I'm still around to collect or pay off ten or even five years from now. Even the Beatles couldn't answer that: "Will you...
... I could not make money on this. I quote: "Bettors provide the name of a charity to receive the winnings if they win." Also, I would have to put up the...
... Tangent - this made me think of the X-Prize foundation. Is it feasible for a successor the X-Prize foundation to be funded from 'contributions on the...
Brian Dunbar
Brian.Dunbar@...
Feb 2, 2004 11:28 pm
3999
In http://pubs.acs.org/cen/NCW/8142acsn.html
Next 2 paragraphs taken from above URL:
"Bacon was meticulous: Though he had produced the first carbon fibers...
... Carbon nanotubes were discovered in 1991. This is interesting: http://www.mrs.org/publications/bulletin/researchnews/dec01/07.html It seems to me that it...
... <snip> ... There seems to be something missing here .. why haven't they been made? I'm guessing manufacturing difficulties or expense rendered them a lab...
Brian Dunbar
Brian.Dunbar@...
Feb 3, 2004 9:26 pm
4002
... Carbon nanotubes have been described as having the structure of a sheet of graphite rolled into a tube. Graphite is a very slippery thing. The sides of...
... Graphite is slippery because the carbon molecules making it up are in the form of flat sheets. The atoms in those sheets bond very strongly to each other, ...
... To late :o) There is still funding for the tether programs (as far as I can tell from the tiny graphics :o) and still 'study' funding for the SE. Randy...
RanulfC@...
Feb 3, 2004 11:09 pm
4006
... Orbital presession(?) would have the two driffting apart, (rapidly) in a few orbits. It's a known problem with having 'free-flying' equipment around ...
RanulfC@...
Feb 4, 2004 2:28 am
4007
... I thought we were talking about moving Hubble to the ISS so it would be easier to repair, then putting it back where it was when it's fully functional...
Gentlemen, If it were possible to bring the Hubble to the vicinity of the ISS, would it be possible to connect the two with a very long tether that would be...
... Possible? yes. likely? no. In order to take good pictures, Hubble needs to be free-flying. One wouldn't want a wave in the tether, it would snap Hubble...
... I don't think that's true. The two orbits would precess at slightly different rates, so after awhile they'd be in very different planes. However, "what...
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