Flywheels / NEO Retrieval Forum: Spacesettlers
Thread: Flywheels / NEO Retrieval
# 1872 byrmenich@... on Oct. 4, 2001, 5:24 p.m.
Member since 2021-10-03
FYI, see http://www.chemicool.com/elements/ for a listing of prices for
many elements.
10/04/01 10:37 AM
Please respond to ssi_list
To: ssi_list@yahoogroups.com
cc: spacesettlers@egroups.com
Subject: Re: [ssi_list] Flywheels / NEO Retrieval
Ian, this is an excellent contribution to the discussion.
Sorry for my tardy reply, the day job is quite demanding currently.
I will reply at more length later, when I have found out the cost per
kilo of Xenon, and can compare it to the cost per kilo to LEO and the
cost per kilo of platinum group metlas.
Cheers,
CFR
Ian Woollard wrote:
>
> Charles Radley wrote:
>
> > Nobody has addressed the amount of propellant which would eb needed
for
> > retrieving an asteroid.
> > It is very large.
>
> Not that large. Consider the rocket equation:
>
[snip[
>
> Ok, here's the data for a Hall thruster:
>
> Propellent: xenon [expensive...]
Charles Radley
10/04/01 10:37 AM
Please respond to ssi_list
To: ssi_list@yahoogroups.com
cc: spacesettlers@egroups.com
Subject: Re: [ssi_list] Flywheels / NEO Retrieval
Ian, this is an excellent contribution to the discussion.
Sorry for my tardy reply, the day job is quite demanding currently.
I will reply at more length later, when I have found out the cost per
kilo of Xenon, and can compare it to the cost per kilo to LEO and the
cost per kilo of platinum group metlas.
Cheers,
CFR
Ian Woollard wrote:
>
> Charles Radley wrote:
>
> > Nobody has addressed the amount of propellant which would eb needed for
> > retrieving an asteroid.
> > It is very large.
>
> Not that large. Consider the rocket equation:
>
[snip[