[ExI] Spacecraft (was MM)

[Samantha Atkins]

On Dec 30, 2010, at 3:18 PM, Keith Henson wrote:

> On Thu, Dec 30, 2010 at 3:24 PM,  "spike" <spike66 at att.net> wrote:
> 
> snip
> 
> (I think some people, no names, are exhibiting delusion of grandeur.)
> 
>> As a spacecraft controls guy I am reluctant to admit it, but this comment is
>> really right on, the conclusion I eventually reached with much kicking and
>> screaming over 20 yrs ago.
> 
> And 20 years ago, that was the right conclusion.  Now we have a path,
> even if it kind of expensive, to 9+km/sec exhaust velocity.  That
> means mass ratio 3 rockets to LEO and even better LEO to GEO.

I must have missed it.  Please give details, links, etc.  How expensive?  How large a payload? What technologies?

- s