[extropy-chat] Space elevator numbers III

Eugen Leitl eugen at leitl.org
Thu Feb 15 05:26:33 UTC 2007

On Wed, Feb 14, 2007 at 07:22:06PM -0500, Keith Henson wrote:

> It doesn't matter what I think about it technically, there just isn't any 
> need for it in the context of an SPS deployment scheme that depends on 
> bootstrapping from the ground.  Oh, I could make Dr. O'Neill's case for 

I think a terrestrial elevator is extremely more demanding, both
because of the scale, and of the issues (satellites) you mention.
A single launch or a couple is enough to put the required
aramide mass into lunar orbit (don't know about the
counterweight). The point is whether a linear motor launcher
at the north pole (built in place, of course) is easier.

The idea is to bootstrap the Lunar pole infrastructure
by teleoperation and largely local resources, achieving
self-replication closure of unity or above with minimal
terrestrial launches. We know that once you're in LEO
Moon surface is about half a year away with plasma thrusters,
which can't be beat as far as propulsion mass is concerned.
Being able to soft-land some 100 kg from a 300 kg LEO
package puts the costs down.

> building up an entire space industry and building SPS out of lunar 
> materials.  But that's already been judged as too risky simply because of 
> the huge number of steps to making a profit from selling power.

Power alone is not alone a motivator, since this leaves you
with a teleoperated industry basis which can grow exponentially.

Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
ICBM: 48.07100, 11.36820            http://www.ativel.com
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