Results 1 to 5 of 5

Thread: A practical space elevator alternative achievable with currenttechnology

  1. #1
    Join Date
    Jun 2002
    Posts
    1,975

    A practical space elevator alternative achievable with currenttechnology

    This hurts me.
    A space elevator from moon's surface to earth geostationary.
    Nice idea, no magic material, or giant counterweight needed, but moon's libration runs up to 8, and perigee and apogee vary by over 150,000 km.
    We'll need to set up a rotatory springy dingy thingy to make something like this work; and we'll still need to get to geostationary to use it.
    Can it work? is it even worth trying? even at 10 floors per second, the trip is still going to take a long long time. where is the steel or aluminum to come from? We can't use lunar concrete.

    Advanced back of envelope calculations, or an actual possibility? I can see us getting a lot of power out of the B field gradients, but big, flexible and springy seem a serious recipe for disaster. What do you all think?

    At least it's unlikely to hit earth, and a striped moon of hubris might be pretty, even if it means disaster.
    Solar wind/ion flux might be problematic as well.
    Maybe if we survive the next hundred years?
    There should be room for more than one of the things, but they'd make great targets too.

  2. #2
    Join Date
    Aug 2006
    Posts
    3,474
    But why? The Moon is a pretty shallow gravity well. The really big well is Earth.

    And the Moon is kinda boring. A Magic Beanstalk wouldn't be of any use lifting anything from Earth to go to the Moon or elsewhere.

  3. #3
    Join Date
    Jun 2003
    Posts
    8,626
    Note as well that the Earthward end of this elevator would be moving quite rapidly with respect to the satellites in geostationary orbit, so mustn't be allowed to come anywhere near them.

  4. #4
    Join Date
    Aug 2006
    Posts
    3,474
    Quote Originally Posted by eburacum45 View Post
    Note as well that the Earthward end of this elevator would be moving quite rapidly with respect to the satellites in geostationary orbit, so mustn't be allowed to come anywhere near them.
    Hmm...

    Geostats have an orbital v of 3km/s.

    An elevator reaching from the Moon to geostat altitude will have a v of 1km/s (2,400,000km per 2,500,000s).

    They both rotate in the same direction (CCW), so the velocities are added. That makes for a relative v of 4km/s.

    But it's more like the geostats are the ones moving fast, while the cable is moseying along at a more sedate pace.

  5. #5
    Join Date
    Feb 2005
    Posts
    11,593
    Quote Originally Posted by eburacum45 View Post
    Note as well that the Earthward end of this elevator would be moving quite rapidly with respect to the satellites in geostationary orbit, so mustn't be allowed to come anywhere near them.
    It may not have to in order to do damage.

    I wonder what the electrical discharge potential this could have dangle down to us...

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •