By Rose Eveleth
Posting in Cities
If we want to build buildings as tall as we possibly can, we'll need a way to get people up and down them. But the space elevator is still a long ways away.
In a recent Atlantic Cities piece about the maximum size of skyscrapers, they wrote that one big parameter that could limit our upward construction was the construction of elevators to the top of the building. Of course, commentors were quick to point out that the author had neglected to mention the use of space elevators. But how realistic are space elevators anyway.
First, let's back up and explain how a space elevator would, in theory, work. The International Space Elevator Consortium (ISEC) explains it this way:
The Space Elevator is based on a thin vertical tether stretched from the ground to a mass far out in space, and electric vehicles (climbers) that drive up and down the tether. The rotation of the Earth keeps the tether taut and capable of supporting the climbers. The climbers travel at speeds comparable to a fast train, and carry no fuel on board - they are powered by a combination of sunlight and laser light projected from the ground. While the trip to space takes several days, climbers are launched once per day.
In 2005, NASA launched a contest called Elevator:2010, with a cash prize to anyone who developed a space elevator. So far, no dice. But is it even possible? At BBC Future, they're skeptical.
Although the concept is simple, the engineering challenges that have to be overcome are awesome. The secret is to find the right material for the ribbon, which has to be light, strong, flexible…oh, and stretch, without breaking, for some 100,000 km (62,000 miles) – higher than geostationary orbit.
Of course, seemingly impossible feats of engineering have been accomplished before. No one in the 1700's would have ever thought we could have built the Empire State Building. All it takes is some materials engineering advances, and about $50 billion. No problem.
Via: BBC Future
Image: Bruce Irving
Aug 21, 2012
Although compatible with the original proposed Tsiolkovsky concept, many at the Space Elevator community do not regard a SpaceShaft as a true Space Elevator. Why? That is something questionable but not to be discussed here since this article should be about super tall buildings. If a thin, super tall building need be build one method is that of the SpaceShaft. http://en.wikipedia.org/wiki/SpaceShaft Although the proposed system uses as an example the use of Helium there are other undisclosed methods that are being experimented with. However, in principle; "it is my believe that Tsiolkovsky never thought of its design as an orbital insertion system but as a system to eliminate the need of a (first stage) rocket system and as to get, (whatever spacecraft,) beyond the atmosphere the limits of the atmosphere. And only then, from summit of the tower: to be these directed, by their own propulsion system, to a desired destination".