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Spaceelevator 20091205 (student preso)
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Spaceelevator 20091205 (student preso)



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general physics
5 dec 2009



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Spaceelevator 20091205 (student preso) Spaceelevator 20091205 (student preso) Presentation Transcript

  • By: Sahapat Wipatavit, Chalermphol Ongsricharoenporn
  • What is a Space Elavator?
    • A space elevator, is an elevator-like type of transportations in which its structure are designed to transport materials from the earth’s surface to space.
  • History of the Space Elevator
    • The space elevator was first introduced in 1895 by a man named Konstantin Tsiolkovsky who was inspired by the Eifel Tower. He had the idea of something that would go straight up into space.
    Konstantin Tsiolkovsky
    • The Fountains of Paradise by Arthur C. Clarke help popularize the idea
    • Despite that, the ideas don’t really catch on because of main problem involving with tensile strength of the cable
  • Structural Problems
    • Making a continuous carbon nanotube cable over 35,000 kilometers long is a difficult task
    • Creating a counter weight that would make the center of gravity of the cable motionless relative to Earth (at geosynchronous orbit)
  • Other problems
    • Space debris - there’s always a chance that space debris or satellites will strike at cable. Some have plan to have the ground station being movable to avoid those
    • It will be a major target for terrorist attack. This can be remedied if it’s protected by military.
  • 21th Century
    • In 1990, a NASA engineer named David Smitherman introduced the
    • carbon nanotubes
    In theory, these carbon nano tubes would allow an orbital skyhook to become feasible and the 35k kilometers cable to be light enough.
  • How the Space Elevator will work
    • A very long cable will be laid around 35 ° to -35 ° longitude (highest lifting efficiency at equator) up into space, with the center of mass at the geosynchronous orbit (counterweight, either in form of space station or asteroids, will be in higher latitude)
    • From ground station, the climber will climb up the cable, powered by, with current idea, ground-based laser that will strike the photovoltaic cells abroad the climber
    • Estimated speed is around 190 km/h, so it would take around a week to get up
    • The reason why carbon nanotube is need is because the tensile strength it is needed.
    Tensile strength of several materials
  • Image of climber going up from sea-based station. Notice the red laser beam.
  • Benefits of the Space Elevator
    • Cost
    • Waste
      • Ex. Nuclear waste
      • Ex. Other toxic materials
    • A more effective solar energy, because the sun’s radiation will not have to go through the ozone layers.
    • Asteroid Detection
    • Space Base
    • A rendition of space elevator
  • Cost (in comparison to Space Shuttle)
    • $100/kg vs 10,000-$40,000/kg
    • $6 billion vs $19 billion
    Per kg: Construction: regularly vs 4 times per year Launch ability:
  • Nuclear waste disposal
    • Storing waste underground will eventually cuase environmental contamination
    • Shoot nuclear waste into the sun
    • Using rockets may have chance of explosion, contamination large area on earth
  • Space-based solar energy
    • Using solar power from space directly is more effective since it will not get reduced by atmosphere and other factors, also there will be a low need to worry about day/night cycle
    • Using rockets, the current launch cost for the system is too expensive
  • Other uses Hotel Asteroid detection Launch objects to other planets
  • References
    • Bonsor, K. (n.d.). How Space Elevators Will Work [Web Site]. Retrieved 25/11/09 from http://science.howstuffworks.com/space-elevator.htm
    • Edwards, B. (2003). The Space Elevator NIAC Phase II Final Report [Web Site]. Retrieved 25/11/09 from http://www.liftport.com/files/521Edwards.pdf
    • Edwards, B. (2007). Ask the Expert [Web Site]. Retrieved 28/11/09 from http://www.pbs.org/wgbh/nova/sciencenow/3401/02-ask.html
    • Irvine, D. (2006). Express lift to the stars [Web Site]. Retrieved 25/11/09 from http://edition.cnn.com/2006/TECH/space/09/18/space.elevator/
    • Raitt, D., Edwards, B. (2004). The Space Elevator: Economics and Applications [Web Site]. Retrieved 27/11/09 from http://www.spaceelevator.com/docs/iac-2004/iac-04-iaa.
    • Wikipedia. (2009). Space Elevator. Retrieved December 2, 2009 from http://en.wikipedia.org/wiki/Space_elevator
    • David, L. (2008). High hopes for space elevator. Retrieved on December 4, 2009. From http://www.msnbc.msn.com/id/3077701/
    •   Nanopedia. (2003). The Strength of Nanotubes. Retrieved on December 4, 2009. From http://nanopedia.case.edu/NWPage.php?page=nanotube.strength
    • Spotts, P. (2003). Going up? Space elevator could slash launch costs. . Retrieved on December 4, 2009. From http://www.csmonitor.com/2003/1002/p14s01-stss.html
    • Edwards, B., & Ragen, P. (2006). Leaving the Planet by Space Elevator . Seattle: Retrieved on December 4, 2009. From www.Lulu.com