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Designing the ice rig Red Dwarf   Message List  
Reply | Forward Message #76309 of 82036 |
Re: [sfconsim-l] Re: Designing the ice rig Red Dwarf

> From: Isaac Kuo <mechdan@...>
> (And what, exactly, do you think this "ice cube"
> is? The targetted moons probably have usefully large
> amounts of ice, but also have a lot of rock/rubble.)

Grab an ice cube that is already headed this way.

How many years will it take your entire orbital industry to use up one small
comet?

-HJC
Tue Jan 13, 2009 9:43 pm

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Forward 		Message #76309 of 82036 |
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Here's the basic timing for an early JMC ice mining mission: 2.75y Earth->Jupiter 0.75y Jupiter->outer moon 1.00y mining (half an orbit) 0.75y outer... 		Isaac Kuo
mechdan
Offline Send Email 		Jan 12, 2009
7:51 pm

... returns will compare favorably with the investment time for establishing lunar aluminum/lox refineries. Return rates are practically lost in the noise...
rmrobinson1227
Offline Send Email 		Jan 12, 2009
9:15 pm

... It may be that any gaps that allow the steam to escape will cause the steam to condense to ice as it percolates through the cold rubble, thus sealing that...
Luke Campbell
panoptes5
Offline Send Email 		Jan 12, 2009
11:09 pm

... Yes, consider this my official surrender to your point of view. For kicks, I calculated some numbers for Saturn, and it actually looks almost as good as...
mechdan
Offline Send Email 		Jan 13, 2009
2:20 am

... LOL - apt analogy! Instead, you can repeatedly poke ... Agreed, but give it a dedicated dish instead of slewing around a main collector. ... I'd only...
rmrobinson1227
Offline Send Email 		Jan 13, 2009
4:48 am

... This has problems with the dishes having limited arcs and getting in each other's way. Remember, you're parked on a rotating asteroid and the main...
Isaac Kuo
mechdan
Offline Send Email 		Jan 13, 2009
4:48 pm

I've thought of a mechanism which combines both "feeding methods". The spine of the ship is a single strong pipe, and the heavy tanks are mounted on a sliding...
Isaac Kuo
mechdan
Offline Send Email 		Jan 13, 2009
5:35 pm

... Why have any tanks at all? Just send a mirror out to bring the entire ice cube back and do your processing at home. -HJC...
Henry Cobb
henry_cobb
Offline Send Email 		Jan 13, 2009
6:24 pm

... Ah, that old gag from Isaac Asimov's THE MARTIAN WAY...
Winchell Chung
nyrathwiz
Offline Send Email 		Jan 13, 2009
6:42 pm

... For many reasons. ... You need to process about half of the harvested H2O into LOX/LH2 in order to get back home. That's assuming you take advantage of...
Isaac Kuo
mechdan
Offline Send Email 		Jan 13, 2009
7:13 pm

... Grab an ice cube that is already headed this way. How many years will it take your entire orbital industry to use up one small comet? -HJC...
Henry Cobb
henry_cobb
Offline Send Email 		Jan 13, 2009
9:43 pm

... Where is this small comet, and how much delta-v are we talking about? How do we move it? Isaac Kuo mechdan@......
Isaac Kuo
mechdan
Offline Send Email 		Jan 13, 2009
9:53 pm

... Moving just takes a mirror in orbit around it and selective heating to vent reaction mass. You catch a tiny comet just as it goes short period and nudge it...
Henry Cobb
henry_cobb
Offline Send Email 		Jan 14, 2009
7:54 am

... This is going to be problematic for many reasons. For one thing, the exhaust velocity will be very poor, but that's just for starters. If you've got a...
mechdan
Offline Send Email 		Jan 14, 2009
8:28 am
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