[extropy-chat] Space elevator numbers V

[Keith Henson]

At 08:44 PM 2/16/2007 -0500, you wrote:
>At 06:38 PM 2/16/2007 -0500, Keith wrote:
>
>snip
>
>
> >A 0.2 mm by 1.5 m by 1 km roll of Invar weights close to 2.5 metric
> >tons.  Punched out holes will reduce the weight to a ton.  After passing
> >through a roll former you get a beam with the cross section of a bracket
> >character.  Why Invar?  Think eclipses.
>
>BTW, this much Invar at 60 10,000 ton power sats per year uses up about 15%
>of the world production of nickle.
>
>Of course after a few years I rather expect nickle from asteroids to start
>coming on the market.

5.4 billion at the current price of $18 a pound.

Keith