SDC or MDC for a Beanstalk

[Braden Campbell]

In one of the Time Odessey books (Arthur Clark and Stephen Baxter), the characters take a ride on a space elevator - takes them 12 days or so, becasue its designed for cargo and not people, but it works. They describe the actual elevator as being a "ribbon" - a very thin, very narrow material whcih is sonstantly patroled by "robot spiders" that race up and down it, always making repairs.

Now in a Phase World setting, all you'd have to do is attach cargo pods with a CG generator, and give them a guideline. The elevator could therefore likewise be a thin ribbon of material, whisered carbon buckyballs for example, anchored to the planet below and an asteroid or space staion in orbit.

Such a thing would have less then 100 MDC per any given point.

[KLM]

It is probably rather fragile.

I mean the materials themselves are rather strong, however
the structure itself is under constant and tremendous tension.

Also, it depends on the size of the lift cabins it is designed for.
Your average contemporary elevator cabin, with life support
and things is probably the smallest one - around a ton with
RIFTS 3G technologies and materials.

Such an elevator system would consist two cables, and about
10 MDC damage could snap one.

In bigger systems it could go considerably higher, as well as
they might have several paralell cables or rails, not just a mere
pair.

Adios
KLM

[taalismn]

Yeah...and prepare for howling noise from the wind blowing over it...
I have a set of massive radio towers near me, and when a good stiff wind starts blowing through the cable stays....

[KLM]

Talking about air guitar...

Adios
KLM

[Aramanthus]

LOL!! I agree with the sentiment so far in the thread. It would have to MDC although fragile. SD weapons shouldn't do anything to it unless you ran an SDC vehicle into it at full speed. That might actually be able to cause some serious fraying in the actual cable. Which could lead to it's severing.

[taalismn]

buckyball cables ...or long chain molecules..

Durability versus safety(as in the beanstalk whiplashing into the planetary surface at supersonic speeds)

[KLM]

That is why there should be at least two - to support each other in case one of them is snapped.

Adios
KLM

[Aramanthus]

I agree KLM! Safety is always important and should be at the forefront.

[KLM]

Also, if we have a pair of cables (periodically interconnected) and one of them snaps,
we only have to repair a single portion of it - instead of a single cable whiplashing
in its - say - half lenght, which is in the case of Earth's geosyncron orbit (when the
sattelite at the end of the cable stays over one point of the planet surface) is around
20.000 kms. Yepp, well over ten thousand miles.

Adios
KLM

[Aramanthus]

Also with the two cables it makes it far easier to carry out repairs. Which is very important.

[gaaahhhh]

They said it was a beanstalk cable, but really it's a giant whip.

[Aramanthus]

Which is anchored at both ends. One on the ground and the other to a satellite in geostationary orbit.

[gaaahhhh]

Which is anchored at both ends. One on the ground and the other to a satellite in geostationary orbit.

...Until one end breaks.

Edit - Who put this section of SDC cable in with the MDC cable?

[Aramanthus]

Don't see that happening unless they have some person messing with contracts. And once it is found out, that person is probably going to be in a world of hurt.

[KLM]

They said it was a beanstalk cable, but really it's a giant whip.

More like a giant ladder if two cables are used. It has to break on at least two places...

Adios
KLM

[Aramanthus]

And who is to say that they don't have some sort of system on the fly which travels up and down the cable regularly to make sure it is not flawed and to correct those flaws when they start to show up in the material.

[KLM]

Actually it can be monitored without any moving parts.

Also, it must be flexible, so it can "bend" out of the way of detected meteorites and such,
but solar flares and the like can and do wear them out.

Adios
KLM

[KLM]

The easiest part is the lenght of the stuff:
It connects the planetary surface and a geostational sattelite/station.

In case of Earth, it would be about 48.000 (forty eight thousand) km.

Adios
KLM

[Aramanthus]

So far the bulk of us seem to be agreement.

KLM, you mentioned the ability to move to avoid asteroids. Would that be the top being able to move? Why not have specialized equipment to intercept incoming asteroids. If we could round them up, we could have a nice supply of raw materials.

[KLM]

KLM, you mentioned the ability to move to avoid asteroids. Would that be the top being able to move?

While the top geostationary station has to have some manouvering
ability, I guess the elevator "cable" itself is easier to bend out of
harms' way.

Why not have specialized equipment to intercept incoming asteroids. If we could round them up, we could have a nice supply of raw materials.

That too, but not every piece of rock worths dealing with rounding up,
and in the case of a bigger one (like a house) might not be worth to
shoot it - because instead of "stepping" out of one projectile's way,
it might look like dodging a shrapnel cloud.

Just my two virtual cents.

Adios
KLM

[Aramanthus]

So you are talking about the cables being smart material that does what it's programmed to do? I wasn't actually thinking of shooting them bown but changing the approaching objects orbit to make it easier to capture.

[KLM]

So you are talking about the cables being smart material that does what it's programmed to do?

If you have that technology, yes.

Otherwise, put on a small cable car, with some repair facilities, a solar panel and a small ion thruster
on it, to do the repairs (after all, one cannot dodge cosmic radiation) and bend the cable if neccessary.

Adios
KLM

[Aramanthus]

Oh ok! That is a cool way of doing the manuevering!