... A space based solar powered laser for power transmission in the megawatt range is far more difficult and expensive to build than the SE, provided the...
To put this in perspective, if my calculations are correct, lifting 1 kg into GEO will require about 50 Megajoules of energy. This sounds like a lot, until you...
The materiel to build SE at this time doesn't exist. When cnt/nanotech matures to the point that a 60,000 mile ribbon (with the correct strength and density)...
What are you assuming for the following efficiencies for? • Converting fuel to electrical power • Electrical power to laser light • Percentage of light...
... FYI, the first solar pumped laser was built in 1963.... _http://www.nap.edu/openbook/0309045770/html/106.html_ ...
RanulfC@...
May 1, 2006 11:12 pm
7127
... the 'building' of a ... but so will ... inflatable ... the ... than a ... report, (and book) ... approach would ... orbit also. ... which is ... given...
... Hopefully you do, but we need to make sure we're on the same 'page' here. This is what I mean by 'modular' lasers: ...
RanulfC@...
May 2, 2006 4:18 am
7129
The 50 Megajoules are pure potential energy, so I made no assumption on the efficiencies. If we can get an overall efficiency of 5%, we'll need $30 per kg to...
Let me add a bit of a reference point: the climbers COULD get up the SE just by pointing their photovoltaics at the sun whenever it's visible; they'd have to...
This link: http://www.m5fiber.com/magellan/m5_technical_info.htm goes to the web site of Magellon Systems, Inc. who have come up with a fabric named M5....
Why would building a space based laser be such a big project? For the purpose of powering the elevator cars, isn't it a logical next step once the SE is...
You need a tensile strenght, not a tensile modulus, over 63 GPa. The compressive strenght in the data presented is 1.6 GPa, so the tensile strenght should be...
Because a 120 MW continuous wave laser of reasonable efficiency is far away from current technology, and when it does become feasible, it is not exactly going...
The statement that the cost of energy is minor seems to need some challange. Although it is miniscule compared to rocket fuel it does look like a significant...
A space-based energy supply makes a lot of sense, and not just for powering space elevator cars. Suppose that there is a solar power satellite, and that all...
Wow! "Energy is far more expensive in space than on Earth" - Have you guys never heard of Solar Power Satellites? Best wishes, Andy Nimmo. ... [Non-text...
I agree Andy, in space energy is free. It is collecting it and distributing it where it is needed that will cost. Of course, it doesn't matter what it costs...
As discussed in earlier posts, the potential energy needed to lift one kg to GEO is 50 megajoule, or $1.38 worth of electrical power, at your rate. Even if we...
Hi Ed, As Bradley Edwards has pointed out, the space elevator itself will bring the SPS concept into being a much more economic proposition. A Landis Slab type...
You are assuming that we can get a system efficiency of 5% In Dr. Edwards book he mentions that total system efficiency may be less than 1% even with future...
... less than 1% even ... that I have seen ... I suppose you are right. I was too optimistic on the efficiency. This raises the question of how to dissipate...
Ah, I think you are confusing tensile modulus (Young's modulus) with tensile strength, a different property. They quote 5.7 GPa tenacity, which is quite...
In a recent discussion with a freind of mine who knows a lot more physics than i, he stated that the most efficient place to put a space elevator would be the...
Placing a space elevator at the poles would do nothing - the physics works because it is at the equator.(We mean the geographic or rotational poles, by the...
Kyros is correct. The elevator is held up due to centripetal force, and a space elevator located at a pole would have zero centripetal force and would not ...
Close, but not quite. You can put one up anywhere you want if you have a strong enough ribbon. At the equator, it will go straight up. If you are off of the ...
In principle, you could put an SE at the pole and rotate it faster than the Earth. It could then be much shorter, and actually have lesser material strength...
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